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Can Water Penetrate Through a Rivet Hole?

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Can water penetrate through a rivet hole? This is a question that engineers and users frequently raise in shipbuilding, car roof assembly, building curtain wall installation, and outdoor equipment design. Although rivets can provide a reliable mechanical connection, whether there is a risk of water seepage after installation has always been a concern in practical applications.

This blog will address this issue from three aspects: structural principles, potential water seepage risks, and waterproofing solutions. The aim is to assist designers and purchasing engineers in clearly understanding whether rivet connections pose any waterproofing risks, and how to avoid leakage by correctly selecting and installing.

How a Rivet Works？

How do Open End Blind Rivets Work

The working principle of a rivet is to firmly fix two or more layers of materials through mechanical deformation. During installation, the rivet shank is stretched or compressed, causing the tail to expand and lock the material, thereby forming a permanent connection.

However, even after the installation of ordinary rivets is completed, there may still be minor gaps at the connection points. These gaps provide a pathway for water to seep in, mainly including:

  • Between the rivet rod and the hole wall: If the hole diameter is too large or the rivet is not fully filled, capillary infiltration channels are likely to form.
  • Through the gap between the material layer and the rivet head: In the presence of external rain or pressure conditions, water may seep in through the gap.

Studies have shown that when exposed to rain, salt spray or humid conditions over a long period of time, these tiny channels will gradually expand, leading to water seepage, rusting and even structural failure. Therefore, in applications such as ships, automobiles and buildings, the waterproof riveting process is particularly important.

Can Water Penetrate Through a Rivet Hole?

Yes, water can indeed seep through the rivet holes. This situation is particularly common in the following scenarios:

  • When using standard blind rivets → Ordinary blind rivets do not have a sealing design, and there is a tendency for tiny gaps to form between the material and the rivet.
  • In outdoor, humid or high-pressure water environments → Under the long-term effects of rain, salt fog or water pressure, water is more likely to enter through the gaps.
  • When the installation process is improper → If the hole diameter is too large or the rivet is not fully tightened, the risk of water seepage will significantly increase.

However, it is important to note that: By selecting the right type and optimizing the process, the risk of water seepage can be significantly reduced. For instance, using sealed rivets, combining with waterproof gaskets, and ensuring that the hole size precisely matches the rivets can all effectively prevent water from penetrating.

Industry experience shows that in shipbuilding and curtain wall projects, when using sealed rivets, the waterproof performance can be improved by 30% to 50%, significantly extending the service life of the structure.

Factors That Influence Water Penetration

Whether the rivet connection will leak water depends on the type of rivets, the installation process, and the usage environment. These factors interact with each other and directly determine the waterproof performance.

1. Rivet Type

Ordinary Open-Type Blind Rivet

The core hole is completely through. It forms a “direct passage”. It is more prone to water seepage under rain pressure or wind pressure. If the hole diameter is slightly larger or if the molding is incomplete, the capillary effect will amplify the leakage. It is suitable for non-waterproof structures. When used outdoors, additional sealing is required.

Rivmate 1 4 Inch Steel Pop Rivets open type blind pop rivet

Closed-End Blind Rivets

Rivmate Aluminum Closed Blind Pop Rivet

The end is sealed. The broken core is sealed inside the body. It blocks the water intake path through the central axis of the rivet. Suitable for nodes requiring air/water tightness such as roofs, curtain walls, and vehicle roofs. It is recommended to choose the “large flange” layout. It can increase the compression area and improve the sealing surface fit.

Sealed Ring Rivets (Gaskets / O-Rings)

Seal rings made of EPDM/fluororubber are installed at the brim. Fill the gaps and absorb assembly deviations. It is recommended to use EPDM with a Shore A hardness of 60-70. It is universal, resistant to weathering, and UV-resistant. When the medium is oil/coolant/chemicals, use fluororubber (FKM) instead. It has better resistance to the medium.

Structural blind rivets / Hole-filling design

The sleeve expansion is more thorough. It has a greater tolerance for hole diameter. The full-hole rate is high, and the probability of water seepage is lower. It is suitable for parts with large vibrations (such as the vehicle roof’s wind vibration and equipment frame).

Interlock Structural Rivet

2. Installation Process

Aperture and Tolerance

The hole size should be exactly matched with the diameter of the rivet body. Generally, it is recommended that D aperture = D rivet body + 0.10 to 0.20 mm (for small-sized thin plates). For steel substrates, the lower limit can be considered. To prevent the formation of “capillary waterways”, ensure that there is no excessive gap. The holes must be de-burred and chamfered. The burrs will widen the gap and damage the sealing rubber membrane.

Clamping Force and Thickness Matching (Grip Range)

The selection should cover the actual layering thickness. If it is too short → not properly clamped, there will be gaps between the surfaces. If it is too long → the shape will be distorted, and the tail end may not bloom or be misaligned. Insufficient clamping is one of the main causes of water seepage.

3. Environmental Conditions

  • Outdoor rain and wind pressure → Long-term exposure to rain and snow increases the risk of water seepage.
  • Marine engineering and ship construction → High humidity and salt fog corrosion accelerate leakage and metal corrosion.
  • HVAC systems and roof engineering → Condensation water and temperature difference cycles cause repeated expansion and contraction at joints, increasing the probability of water seepage.

How to Prevent Water Penetration Through Rivet Holes

Types of Blind Rivets

a. Choose the Right Rivet

Closed-End Blind Rivet

The end is sealed. It blocks the pull pin channel. It is naturally more waterproof. It is recommended to use large flange/flat head. This increases the compression area and reduces the gap between surfaces. For the wet side installation surface, use semi-round head instead of countersunk head. The countersunk head is more dependent on the adhesive and has lower tolerance.

With sealing ring or structural type (Sealed / Structural)

Choose the model with built-in O-ring/retainer ring. It can automatically compensate for minor assembly deviations.
Sealing material: EPDM (Shore A 60-70) – universal weather resistance; FKM – resistant to oil, refrigerants, and chemicals.
Structural/inserted-hole design, higher full-hole rate. More tolerant of hole tolerances, lower chance of water seepage.

Material and coating match the environment

Regular outdoor: Stainless steel or carbon steel + zinc nickel/ALMAC/dactro.
Marine and high salt spray environments: Stainless steel (A4) or Monel are preferred.
Avoid direct contact between aluminum and carbon steel. In case of necessity, add electrical isolation gaskets or coating isolation.

Model Selection Quick Reference

  • For general outdoor applications, use closed-type blind rivets (with large cap).
  • In case of heavy rain and wind pressure, use closed-type along with O-ring or washer.
  • In vibration conditions, use structural-type blind rivets (with core retention/high clamping).

b. Add Sealing During Installation

Sealant

Select butyl/silicone/MS polymer/polyurethane. Requirements: UV resistance, water resistance, compatible with the substrate.

For sensitive materials such as polycarbonate, avoid acidic silicone. Use neutral curing type.

The sealing process should be continuous closed loop. Recommended 1-2 mm diameter sealing strips. No breaks are allowed.

Application and curing

Sequence: Clean → Apply adhesive → Insert pins → Pull pins → Make another ring of “Edge Sealant” on the outside.

Surface should be clean, dry and free of oil. Wipe with isopropyl alcohol and let it dry.

Avoid over-pressing at once. Excessive pressing can cause “air pockets”. It is advisable to have a slight amount of excess adhesive.

Gaskets/Washers

For the wet side, use a combination of metal pad and EPDM sealing pad. The metal pad bears the pressure, and the rubber provides the seal.

The compression amount should be controlled at 20-30% of the rubber thickness. If it is too loose, it won’t seal properly; if it is too tight, it will age easily.

Before re-tightening or applying additional glue, remove the old glue and the oxide layer first.

c. Process Optimization

Hole quality and tolerance

  • Recommended hole diameter: D hole = D nail body + 0.10 – 0.20 mm (for small-sized thin plates).
  • Deburr and chamfer. The burrs will widen the gap and disrupt the continuity of the adhesive film.
  • The hole must be vertical. Inclined holes will cause the cap edge to not be properly pressed.

Clamping and Travel (Grip & Stroke)

  • Grip Range covers the actual layer thickness. Too short → not clamped; too long → the tail does not open.
  • Use a tool with controllable stroke or pulling force. Ensure consistency and repeatability of the broken core.
  • The gun nozzle and the pull pin axis are perpendicular to the board surface. Avoid eccentric shaping.

Construction and Arrangement

  • Use water flow reverse connection. Make the water flow away from the riveting line.
  • Margin ≥ 1.5D – 2D, spacing ≥ 4D – 6D (D is the diameter of the rivet). Reduce edge leakage and stress concentration.
  • If necessary, set up a second line of defense: main seal (rivet/ washer) + secondary seal (gluing along the joint).

Industry Applications & Best Practices

Heavy Duty Lockbolts Fastener Rivets Application
IndustryWater Leakage RiskRecommended Rivet Type
Marine & ShipbuildingHigh salt spray, high humidity, long-term seawater exposureStainless steel closed-end rivets + sealant
Automotive & RV RoofsContinuous rain exposure, vehicle vibrationClosed-end blind rivets, optionally with sealing washers
Building Facades & HVACWind pressure + rain infiltration, frequent temperature and humidity changesSealed rivets or structural rivets, applied with sealant

Marine Engineering and Shipbuilding
It is necessary to use stainless steel closed rivets and combine them with waterproof sealant to resist corrosion from salt spray and seawater. Research shows that ordinary carbon steel rivets may experience rust and failure within six months in an ocean environment.

Car and RV Roof
The closed-type rivets can effectively prevent rainwater from seeping through the core holes. For the vehicle roofs that are exposed to rain and snow for a long time, it is also recommended to install rubber gaskets to enhance the sealing effect.

Building Curtain Wall and HVAC System
Changes in wind pressure and temperature as well as humidity can easily cause small gaps at the joints of curtain walls. For such applications, it is recommended to use sealing or structural rivets, and apply sealant during installation to ensure long-term waterproofing.

Rivmate Expertise & Solutions

Monel Blind Rivets - Buy High Quality Monel Rivets from Rivmate

Rivmate is well aware that different industries have varying requirements for waterproofing and corrosion prevention. Therefore, we offer a complete range of rivet products and technical support to help customers effectively manage the risk of water seepage.

Rivmate Product Coverage

  • Closed-End Blind Rivets Designed specifically for waterproof and air-proof applications, it effectively prevents moisture and air from entering through the core hole.
  • Rivets with sealing rings
    Adding sealing rings at the head or tail of the rivets creates an additional barrier, suitable for use in curtain walls and vehicle roofs.
  • Multiple material options (aluminum, stainless steel, Monel)
    Choose the optimal solution based on the application environment: Aluminum is suitable for lightweighting, stainless steel is suitable for outdoor use, and Monel is suitable for marine and extremely corrosive environments.

Rivmate Technical Support

  • Waterproof Selection Guide
    For different working conditions, detailed suggestions on bolt selection are provided to help customers avoid potential water seepage problems caused by incorrect selection.
  • Process Improvement Suggestions
    Including aperture control, sealant application and installation force calibration, to ensure the best sealing effect.
  • Customized anti-corrosion and waterproof solutions
    Special surface treatments and structural optimizations can be provided according to customer requirements, meeting the long-term durability standards.

FAQs

Q1: Will all the rivets leak water?

Answer: Not all rivets will leak. Standard blind rivets do have a risk of water leakage when there is no sealing design. However, closed-type rivets or the riveting process combined with sealant can effectively prevent water leakage.

Q2: Can the closed-type rivets completely prevent water from penetrating?

Answer: Closed-type rivets can significantly enhance the waterproofing performance. However, in environments with high-pressure water or prolonged exposure, it is still recommended to use sealants or waterproof gaskets in conjunction to ensure long-term reliability.

Q3: Is additional sealant required when installing on the roof?

Answer: It is recommended to use. The roof is constantly exposed to rain, snow and temperature fluctuations. The sealant can fill the tiny gaps between the materials and the rivets, thereby extending the lifespan of the waterproofing.

Q4: Can Rivmate provide waterproof rivets suitable for marine environments?

Answer: Yes. Rivmate offers stainless steel closed rivets and Monel material rivets, and they can be combined with high-performance anti-corrosion coatings, ensuring waterproofness and durability even in salt spray and high humidity environments.

Seal Your Projects with Confidence – Choose Rivmate Rivets

Rivmate Rivet Factory in Jiangsu, China

No matter whether you are dealing with marine environmental protection for ships, roof waterproofing for cars, or sealing for building curtain walls, Rivmate can offer you the most reliable waterproof riveting solutions.

Not only do we offer closed-type blind rivets, rivets with sealing rings, and multiple material options, but we also provide customers with waterproof selection guidelines, process optimization suggestions, and customized solutions.

Choose Rivmate and ensure that your project achieves higher durability and zero leakage protection.

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What Material Is Self-Piercing Rivets？

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What material is self-piercing rivets? The selection of materials not only affects the strength of the rivets themselves, but also directly influences their anti-corrosion performance, fatigue life and the reliability of the overall assembly.

The material of self-piercing rivets is the core factor determining the success or failure of the process. Different materials determine whether they can adapt to high-demand applications such as automotive lightweighting, aerospace, or building curtain walls. This blog will systematically introduce the common materials of SPR and provide a professional selection guide.

What Materials Are Self-Piercing Rivets Made From?

The material selection of self-piercing rivets (SPR) directly determines their strength, corrosion resistance and service life. Different materials are suitable for different working conditions. Reasonable selection can reduce the risk of failure and extend the service life of the structure. The following are several common types of SPR materials:

a. Carbon Steel SPRs

Limitations of SPR
  • Features: High strength and excellent cost performance.
  • Applications: Commonly used in the connection of automotive steel plates and in construction steel structures.
  • Disadvantages: Insufficient corrosion resistance. Usually requires galvanization, electrophoresis or surface coating treatment to enhance protective capabilities.

b. Stainless Steel SPRs

  • Features: It boasts excellent corrosion resistance and high strength. Even in damp, salt spray or chemical environments, it can maintain stable performance.
  • Applications: It is used in aerospace, shipbuilding, marine engineering, and various outdoor structures exposed for long periods.
  • Disadvantages: It is costly, difficult to process, and requires higher standards for molds and equipment.

c. Aluminum SPRs

  • Features: Lightweight and avoids the common problem of electrochemical corrosion in aluminum structures (especially in aluminum-to-aluminum connections).
  • Applications: Widely used in automotive lightweight bodywork, home appliances, and electronic product casings.
  • Disadvantages: Lower strength than steel and stainless steel, not suitable for components that need to bear high loads or long-term high stress.

d. Special Alloys (e.g., Monel, Titanium)

  • Features: It can maintain stable performance under high-temperature, high-corrosion or extreme working conditions.
  • Applications: Mainly used in high-end manufacturing fields such as aerospace, energy equipment, and military industry.
  • Disadvantages: The cost is extremely high and it is usually only applied in special scenarios.

Comparison Table by Material

MaterialStrengthCorrosion ResistanceWeightCostTypical Applications
Carbon SteelHighMedium (requires coating)HeavyLowAutomotive steel structures, Building panels
Stainless SteelHighHighHeavyHighAerospace, Marine, Outdoor structures
AluminumMediumMedium (surface treatment needed)LightMediumAutomotive lightweight design, Appliances, Electronics
Monel / TitaniumVery HighVery HighMediumVery HighAerospace, Energy, Defense
  • Carbon steel SPR
    The advantages are high strength and low cost, making it suitable for mass production. The disadvantage is that it has insufficient corrosion resistance and requires galvanization or protective coatings. It is commonly used in automotive body steel plates and building steel structures.
  • Stainless Steel SPR
    It combines strength and corrosion resistance, and can maintain stability in harsh environments. The drawback is that it has a high cost and is difficult to process. Typical applications include aerospace, marine engineering, and long-term outdoor structures.
  • Aluminum SPR
    The greatest advantage is its light weight, which makes it highly suitable for lightweight design. It can avoid electrochemical corrosion of the aluminum-aluminum structure. However, its strength is lower than that of steel and stainless steel, and it is not suitable for high-load components. It is mostly used in aluminum car bodies, household appliances and electronic devices.
  • Monel / Titanium Alloy SPR
    It belongs to high-end application materials and possesses extremely high strength and corrosion resistance. It can be used for a long time in high-temperature, high-salt spray and extreme environments. However, the cost is extremely high and it is only suitable for special fields such as aerospace, energy and military industry.

How to Select the Right SPR Material?

SPR Solutions

Selecting the appropriate self-tapping rivet (SPR) material requires comprehensive consideration from three aspects: material matching, operating environment, and cost-performance balance. Correct selection can prevent early failure, extend product lifespan, and ensure assembly efficiency.

1) Matching of Materials

Aluminum + Aluminum → Use Aluminum SPR, avoiding electrochemical corrosion and maintaining lightweight characteristics.

Aluminum + Steel → It is recommended to use Steel SPR, but additional surface anti-corrosion measures are required, such as galvanizing or protective coatings.

Steel + Steel → Depending on the requirements, choose Carbon Steel SPR or Stainless Steel SPR. If exposed to a humid environment for a long time, stainless steel is more recommended.

2) According to Environmental Conditions

Indoor Applications → Carbon steel SPR is usually sufficient and offers good value for money.

Outdoor or high humidity environments → Choose Stainless Steel SPR, to ensure long-term corrosion resistance.

Oceans or extreme environments → It is recommended to use Monel or titanium SPR, which can maintain stable performance even in high salt spray and strong corrosive conditions.

3) Based on the Cost vs Performance Tradeoff

Carbon Steel SPR: The lowest cost, suitable for large-scale standard applications.

Aluminum SPR: Balances lightweighting and moderate corrosion resistance requirements, commonly used in automotive lightweighting designs.

Stainless Steel SPR: It has a relatively high cost, but it is indispensable in aerospace, marine and outdoor engineering applications.

Monel / Titanium SPR: This belongs to the high-end solution category. Although it is extremely costly, it holds unique value in the fields of aerospace, energy, and military industry.

Surface Treatments for SPRs

In the application of self-tapping screws (SPR), surface treatment plays a crucial role in corrosion resistance, service life and reliability. Different surface treatment methods have their own advantages and are suitable for different scenarios.

Galvanized (Zinc-Plated) SPRs

Galvanization is the most common SPR (Steel-Prepared-Rust-Free) anti-corrosion treatment method. It covers the surface of the rivets with a layer of zinc to form a barrier, preventing the steel from directly contacting air and moisture, thereby delaying corrosion. The galvanization process is mature and has a low cost, so it is widely used in automotive steel structures and interior assembly. It should be noted that in high salt spray or marine environments, a simple galvanized layer may be insufficient, and usually additional protective measures need to be combined.

What is the History of Self Piercing Rivets?

Nickel or Tin Plated SPRs

Nickel-plated or tin-plated SPR is more durable than galvanized coating and can significantly enhance corrosion resistance and wear resistance. These treatment methods are highly suitable for scenarios requiring long-term stable operation, such as aviation components or the electronics industry. The nickel plating layer also has certain electrical conductivity and is suitable for assembly in electrical equipment. However, the process cost of nickel plating or tin plating is higher, so it is usually only applied to products with extremely high requirements for durability and reliability.

Anticorrosive Coating (E-coating, Organic Coating)

Electrophoretic coating (E-coating) or organic anti-corrosion coating can form a uniform and dense protective layer on the SPR surface. This coating not only effectively resists salt fog, acidic environments and chemical corrosion, but also can form a covering in the gaps of complex structures, providing a better protective effect than traditional coatings. Therefore, this type of surface treatment is often used in marine engineering, building facades and equipment exposed to the outdoors for a long time. Compared with galvanizing or nickel plating, although the anti-corrosion coating is slightly more expensive, it can significantly extend the service life of SPR in harsh environments.

Applications by Material

1. Automotive Industry

Carbon steel SPR: Commonly used in vehicle body steel structures, it can provide high-strength connections and is suitable for withstanding impacts and vibrations.

Aluminum SPR: Widely used in aluminum alloy vehicle bodies, it helps automobiles achieve lightweight design, reducing fuel consumption and carbon emissions.

2. Aerospace

Stainless Steel SPR: Used in aircraft fuselage connections and cabin door components, it offers high strength and corrosion resistance.

Titanium SPR: Suitable for use in high-temperature and highly corrosive environments, commonly found in the vicinity of engines and critical structural parts.

3. Construction Industry

Carbon steel SPR + surface galvanization: Suitable for curtain walls, steel structure frames and roof systems. The galvanization process enhances corrosion resistance and prolongs the lifespan of the building.

4. The Appliance Industry

Aluminum SPR: Suitable for the shells of refrigerators, washing machines, air conditioners, etc. Aluminum material is not only lightweight but also maintains a good appearance, and is suitable for rapid assembly of thin plate structures.

Rivmate Expertise & Solutions

schematic diagram of the SPR process

As a professional supplier of self-piercing riveting (SPR) solutions, Rivmate continuously innovates in material research and surface treatment to ensure that its products can meet the strength, corrosion resistance and durability requirements for various application scenarios.

① Material of Rivmate SPR Products

  • Boron steel (37MnB5 / 36MnB4) Rivmate widely adopts this type of high-strength boron steel in the foreign trade market, replacing the earlier used SCM435. Its performance is stable and it is suitable for most automotive and construction applications.
  • 304 Stainless Steel Due to insufficient hardness, it is currently impossible to effectively penetrate the 5-series aluminum plate, so production has not yet been carried out.
  • 420 Stainless Steel (Iron-based, Carbon-containing) The hardness can be enhanced through heat treatment, and it is capable of piercing 5-series aluminum materials. However, there are still limitations when it is applied to 6-series and 7-series aluminum materials.

② Rivmate SPR Surface Treatment

  • Mechanical Galvanizing (Zinc-Tin Alloy) → Can achieve 240H without rust, suitable for medium-level corrosion prevention needs.
  • Zinc-Nickel Electroplating (Zinc-Nickel Alloy) → Provides 480H without rust, with superior corrosion resistance.
  • Dacromet (Zinc-Aluminum Coating, Chromium Included) → Common protective method, can reach 240H without rust.
  • ALMAC (Zinc-Aluminum Coating, Chromium-Free, Environmentally Friendly) → Offers 480H without rust, compliant with environmental regulations.

③ Support Provided by Rivmate

  • Engineering Material Selection Recommendation: Based on the customer’s material combination and process requirements, we recommend the most suitable SPR material and surface treatment.
  • Material Compatibility Consultation: Assist customers in avoiding electrochemical corrosion issues between different materials such as aluminum and steel.
  • Customized Solutions: According to the specific industry requirements, we provide exclusive material optimization and coating customization services.

FAQ

Q1: What is the most common material used in SPR?

Answer: Currently, the most common type is carbon steel SPR. It has high strength and low cost, making it suitable for large-scale applications such as in automobiles and construction. If corrosion resistance is required, it can be combined with galvanization, nickel plating or coating processes.

Q2: Can steel SPR be used on aluminum materials?

Answer: Yes, but be aware of the issue of corrosion prevention. The combination of steel and aluminum may result in electrochemical corrosion. It is recommended to perform appropriate surface treatments (such as galvanizing, ALMAC) or add an isolation layer to ensure long-term reliability.

Q3: What material is the most suitable for SPR in marine environments?

Answer: In marine environments, Stainless Steel SPR or Monel/Titanium SPR perform the best. They can resist salt fog and long-term humid conditions. However, cost considerations should be taken into account. Titanium and Monel are typically used for high-end or critical components.

Q4: Can Rivmate offer customized SPR materials?

Answer: Yes. Rivmate can provide customized material options (such as special alloys) and surface treatment solutions (such as the 480H corrosion-resistant ALMAC coating) based on the customer’s working conditions. We can also offer material compatibility consultation to prevent connection failure due to improper material selection.

Choose the Right SPR Material with Rivmate

Rivmate SPR Rivet(Self piercing rivet)

The materials of self-tapping screws (SPR) mainly include carbon steel, stainless steel, aluminum and special alloys. Each material has its own advantages: carbon steel focuses on cost-effectiveness, stainless steel emphasizes anti-corrosion performance, aluminum meets the demand for lightweight, and special alloys are suitable for extreme environments. The correct selection of material is the key to ensuring connection strength, durability and cost control.

Contact us to obtain customized material and surface treatment solutions, enabling your project to achieve the optimal balance between performance and cost.

Reference

Self-Piercing Rivet

Self-Piercing Rivets for Aluminum Body Fastening

Types of Rivets

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What Is Self-Piercing Riveting Used For?

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What is self-piercing riveting used for? This is the most frequently raised question by manufacturing engineers and designers when dealing with the demand for new material connections. With the widespread application of lightweight design and composite materials, traditional welding and riveting processes are facing challenges. The use of high-strength steel, aluminum alloys, and coated sheets has led to the occurrence of heat affected zones during welding, and traditional rivets are unable to meet the dual requirements of efficiency and strength.

In this context, Self-Piercing Riveting (SPR) has become the preferred process in an increasing number of industries. It does not require pre-drilling and can efficiently connect different materials, and is highly suitable for automated production. This article will systematically elaborate on the typical application fields of SPR and explain why it has rapidly gained popularity in industries such as automotive, aerospace, and construction.

Why SPR Is Valuable Across Industries？

Limitations of SPR

The reason why self-piercing riveting (abbreviated as SPR) has been widely used in various industries such as automobiles, aviation, and construction is due to its unique technical characteristics. These characteristics not only address the shortcomings of traditional welding and riveting, but also provide new possibilities for lightweighting and the use of unconventional materials.

a. Single-Sided Operation

The SPR only needs to be operated on one side of the workpiece. Even if the back side cannot be accessed, assembly can still be completed. This feature is particularly important in automotive body and sealed structures.

b. No Pre-Drilling Required

Unlike traditional riveting, SPR can directly penetrate the upper layer material under high pressure. This eliminates the drilling process and enhances production efficiency. According to industry research, omitting the drilling step can increase the assembly cycle time by 20%-30%.

c. Ideal for Multi-Material Joints

SPR can achieve reliable connections in combinations such as aluminum + steel, galvanized steel + composite materials. Traditional welding is often limited in these scenarios, but SPR can ensure strength and durability.

d. No Heat Affected Zone (HAZ)

SPR is a cold processing technique that does not alter the mechanical properties of the material nor damage the surface coating. Compared to welding, it can effectively prevent material deformation and the decline in fatigue performance.

e. Automation Friendly

SPR is highly suitable for robots and automated production lines. It has high consistency and strong repeatability, which can meet the requirements of mass production. Therefore, SPR has become one of the standard processes in automotive lightweight production lines.

1. Automotive Industry

Self-piercing riveting (SPR) is the most widely used in the automotive industry, especially in aluminum bodywork and lightweight structures.

1.1. The Most Applicable Scenario

  • Aluminum body and panels.
  • Lightweight frame and suspension components.
  • Aluminum + steel hybrid material body structure.

1.2. Resolution of Pain Points

  • Welding aluminum alloy is difficult and it is prone to generate heat affected zone (HAZ), which leads to a decline in material performance.
  • Traditional spot welding has poor adaptability to aluminum and galvanized steel, and the quality of the weld points is unstable.
  • SPR can achieve reliable mechanical locking in the multi-layer structure of aluminum + steel, avoiding welding defects.

Applications of SPR

1.3. Industry Cases

  • The body of Tesla Model 3 is connected using SPR.
  • Jaguar Land Rover extensively uses SPR in its all-aluminum body structure.
  • BMW combines SPR with adhesives in its lightweight frame to achieve high strength and durability.

1.4. Value Realization

  • Lightweighting: Reduces vehicle weight, enhances fuel efficiency and extends electric vehicle range.
  • Energy conservation and emission reduction: Complies with the low-carbon trend in the global automotive industry.
  • Production efficiency improvement: SPR can be integrated into robot assembly lines to achieve efficient mass production.

According to a study by the European Automobile Manufacturers Association (ACEA), aluminum bodies using SPR technology can reduce weight by 25%-30% compared to traditional steel bodies. This directly leads to lower energy consumption and emissions.

2. Aerospace Industry

In the aerospace field, self-piercing riveting (SPR) has gradually become the preferred joining process for aluminum alloy and composite material structures.

2.1. Application Scenarios

  • The combination of aluminum alloy fuselage skin and composite material frame.
  • Multi-layer structural components such as aircraft doors, wings and support beams.
  • Lightweight structural assembly for unmanned aircraft and light aircraft.

2.2. Resolution of Pain Points

  • Composite materials cannot be welded using traditional methods as welding would damage the fiber structure of the material, resulting in a decrease in strength.
  • SPR achieves connections through cold processing, without generating a heat affected zone (HAZ).
  • In multi-layer or heterogeneous material combinations, SPR can ensure high strength and long-term stability.

2.3. Value Realization

  • Maintain material integrity: Avoid welding thermal damage and preserve the original properties of the composite materials.
  • Enhance safety: In high-vibration and fatigue environments, the lifespan of the SPR joints is longer.
  • Extend service life: Reduce maintenance frequency and lower the total life cycle cost.

According to the supply chain data of Boeing and Airbus, SPR has been applied in the local assembly of multiple aircraft models, replacing some traditional riveting and gluing processes. Practice has shown that SPR can achieve dual optimization of weight and maintenance costs while ensuring structural reliability.

3. Appliances & Electronics

Self-piercing riveting (SPR) is increasingly being used in the home appliance and electronics industries, and is particularly suitable for metal casings and lightweight structural components.

3.1. Application Scenarios

  • The exteriors of household appliances such as refrigerators and washing machines.
  • Server chassis and the exteriors of network devices.
  • Other metal chassis structures that require lightweight and durability.

3.2. Resolution of Pain Points

Self Piercing Rivets for Sheet Metal- Self Piercing Rivets Application
  • If thin plates and coated metals are welded, the coating is likely to be damaged, resulting in a decline in anti-corrosion performance.
  • The traditional screwing method may affect the appearance and requires more processes.
  • SPR does not require a heat source and is a cold processing technique, thus it will not damage the surface coating and layer.

3.3. Value Realization

  • Aesthetically pleasing: The joints are smooth and free of welding slag or thermal deformation.
  • Durable structure: The connection has high strength and can withstand vibrations and impacts during daily use.
  • Excellent corrosion resistance: The coating remains intact, extending the service life of the product.

According to the data from the Appliance Manufacturing Association (AHAM), the lifespan of metal casings produced using the SPR process can be extended by 20%-25% compared to those with welded structures, while production efficiency is also improved.

4. Construction & HVAC Systems

Self-piercing riveting (SPR) is gradually gaining popularity in construction and HVAC (Heating, Ventilation, and Air Conditioning) systems. It enables efficient connection of metal sheet structures, thereby enhancing construction and production efficiency.

4.1. Application Scenarios

  • Building curtain wall system.
  • Air conditioning unit and outdoor unit casing.
  • Ventilation ducts and support framework.

4.2. Resolution of Pain Points

In buildings and HVAC equipment, a large amount of coated steel plates and lightweight metal parts are used.
Traditional bolt connections require drilling, which involves multiple processes and is slow.
Welding may damage the coating and increase the cost of subsequent anti-corrosion treatment.
SPR is a cold processing method that does not require drilling or heat sources, and is more suitable for batch automated production.

Wholesale Self Piercing Rivets

4.3. Value Realization

  • Improve construction efficiency: Eliminate the drilling and post-processing procedures, thereby accelerating the assembly cycle.
  • Ensure structural aesthetics: The joints are smooth, without weld slag or additional bolt protrusions.
  • Reduce maintenance costs: Maintain the integrity of the coating, reducing corrosion and rework.

According to the test results of the Building Curtain Wall Council (CWCT), the SPR joint performed stably in long-term wind pressure and water penetration tests, and its durability was superior to that of the traditional bolted connection method. This is also the important reason why it has gradually become the preferred connection technology in modern architecture and HVAC industries.

5. Other Emerging Applications

Apart from the automotive, aviation, home appliance and construction industries, self-piercing riveting (SPR) has also demonstrated great potential in other sectors.

Railway and Transportation

  • SPR can be used for lightweight carriages, door panels and structural components.
  • Compared to welding, SPR can reduce thermal deformation and ensure assembly accuracy.
  • In high-speed trains and subway vehicles, SPR helps to reduce weight and improve energy efficiency.

Renewable Energy

  • SPR can be applied to wind turbine towers, solar support structures and lightweight metal frameworks.
  • It can form a high-strength connection between coated steel and composite materials.
  • Compared to bolt connections, SPR joints are smoother and have lower maintenance costs.

Industrial Equipment

  • In heavy machinery and production equipment, some components require long-term and reliable multi-material connections.
  • SPR can provide stable shear resistance and fatigue resistance, thereby extending the equipment’s lifespan.
  • It is particularly suitable for scenarios that require low maintenance and high durability.

Advantages That Drive These Applications

Self Piercing Rivets for Aluminum - Buildings and infrastructure

Self-piercing riveting (SPR) has been able to rapidly gain popularity across various industries, primarily due to its combination of efficiency, strength, and environmental friendliness. Firstly, SPR excels in compatibility with different materials. It can easily connect various combinations such as aluminum + steel, coated steel + composite materials, and traditional welding often struggles to achieve stable joints in these scenarios.

SPR is highly suitable for highly efficient automated production. Since it does not require pre-drilling, it can be directly integrated into the robot production line. Compared with the traditional drilling + riveting process, the overall cycle efficiency can be improved by up to 20%-30%.

In terms of environmental protection and safety, SPR is a cold processing technique. It does not produce the common smoke, sparks or slag seen in welding, thus avoiding potential hazards to operators and the workshop environment. Additionally, it consumes less energy, aligning with the low-carbon trend in global manufacturing.

Strength and durability are also important advantages of SPR. SPR joints not only have excellent shear resistance, but also can remain stable in high-vibration environments, and their fatigue life is superior to spot welding. This is particularly crucial in structures that are subjected to long-term loading and impact, such as in automobiles and aviation.

Finally, from the perspective of overall economy, although the initial equipment investment of SPR is relatively high, its high consistency and low rework rate significantly reduce the maintenance and scrap costs in the later stage. For enterprises that pursue high quality and long-term reliability, the cost of SPR throughout its entire life cycle is lower.

Rivmate Expertise & Solutions

Limitations of SPR

Rivmate specializes in the self-piercing riveting (SPR) technology and is capable of providing comprehensive product and service support for various industries. Our solutions not only cover a wide range of working conditions but also help customers achieve efficient and reliable production.

Coverage of Rivmate SPR Products

  • Various materials: Steel, stainless steel, aluminum, meeting different strength and corrosion resistance requirements.
  • Comprehensive Grip Range: Suitable for connection needs ranging from thin plates to multi-layer structures.
  • Strict compliance with standards: All products comply with the international standards of ISO 14589 and DIN 7337, ensuring quality and consistency.

Rivmate's Service Capabilities

  • Industry-specific customized solutions: Provide professional connection process support for sectors such as automotive, aviation, construction, and home appliances.
  • SPR process evaluation and selection guidance: Based on material combinations and structural requirements, assist customers in choosing the most suitable rivets and process parameters.
  • Support for automation production compatibility: Assist customers in integrating the SPR process into robots and automated production lines, thereby enhancing efficiency and consistency.

Choosing Rivmate not only enables you to obtain high-performance SPR rivets, but also provides you with full-chain support from model selection to process validation, from small-batch trial production to automated production. Our goal is to help customers reduce risks, improve efficiency, and achieve higher connection reliability.

FAQs

Q1: Why does the automotive industry particularly favor SPR?

Answer: The automotive manufacturing industry is currently trending towards lightweighting and the integration of multiple materials. Traditional welding has limitations in connecting aluminum and coated steel, and it is prone to creating heat-affected zones. SPR, on the other hand, does not require a heat source and can achieve stable connections in structures made of different materials such as aluminum and steel. Therefore, car manufacturers like Tesla, Jaguar Land Rover, and BMW have adopted the SPR process on a large scale.

Q2: Can SPR completely replace welding?

Answer: It cannot completely replace. SPR performs exceptionally well in aluminum alloys and multi-material connections, but for extremely thick plates or high-load structures, welding still has a greater advantage. Therefore, SPR is usually combined with welding, structural adhesives, and other processes to achieve the best strength and durability.

Q3: Is SPR suitable for high-strength steel?

Answer: SPR can connect some high-strength steel, but it requires choosing the appropriate rivet material and mold design. If the steel is too hard, the rivets may not be able to penetrate effectively. In such cases, process verification is necessary to ensure the quality of the joint.

Q4: Does Rivmate offer training on the SPR process?

Answer: Yes. Rivmate not only offers high-quality SPR rivets, but also provides training on the manufacturing process and selection guidance. Our engineering team can assist customers in equipment debugging, process validation, and production line integration, ensuring the stability and reliability of SPR in actual production.

Transform Your Manufacturing with Rivmate SPR Solutions

Self Piercing Rivets for Automotive Body Connections

Rivmate invites you to download the latest SPR Industry Application White Paper, to gain a deep understanding of the practical applications and best practices in various industries. Additionally, our technical team can provide you with customized process assessment and solutions, ensuring that each riveting operation achieves the optimal performance.

Contact us immediately to unlock the efficiency, strength and long-term value brought by the SPR process.

Reference

What is self-piercing riveting and how does it work?

What is self-piercing riveting used for?

Types of Rivets

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What is the Process of Self-Piercing Rivets?

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Traditional welding and conventional riveting have gradually shown limitations in the combination of aluminum, composite materials, and mixed materials such as aluminum and steel. At this point, more and more engineers have begun to pay attention to the process of self-piercing rivets. This technique can achieve efficient and reliable mechanical connections without the need for pre-drilling.

Self-Piercing Riveting (SPR) is an advanced connection technology. It uses specially designed rivets and high-pressure equipment to achieve rapid assembly without compromising the material’s properties. This article will provide a detailed analysis of the process flow, technical principle, and application value of SPR from a professional perspective, covering its use in industries such as automobiles, aviation, and construction.

What Are Self-Piercing Rivets?

Self-Piercing Rivets (SPR for short) is an advanced mechanical fastening method. It uses high pressure to directly press the rivet into the material. The tip of the rivet pierces through the upper layer of material and expands and locks in the lower layer of material, thus forming a strong mechanical connection.

Advantages of SPR

The structure of self-piercing rivets mainly consists of three parts:

  • Head: Fixed on the surface of the material, providing clamping force.
  • Shank: Penetrates the material and transmits pressure.
  • Hollow Tail: Expands in the lower layer of the material to achieve a locking effect.

Compared with traditional riveting or welding processes, SPR has significant features:

  • Single-sided operation → Installation can be completed without touching the backside.
  • No pre-drilling required → Save processes and improve production efficiency.
  • No heat-affected zone (HAZ) → Avoid common metal property degradation or deformation in welding.

According to industry research, the application ratio of SPR in automotive lightweight manufacturing has exceeded 60%, especially in the dissimilar joining of aluminum alloys and steel. Its popularity stems from the demand for high strength, environmental friendliness, and high-efficiency assembly.

The Step-by-Step Process of SPR

Self Piercing Rivets for Automotive - High Cost Self Piercing Rivets Tool

Self-piercing riveting (SPR) is an efficient and reliable mechanical joining method. The entire process is divided into four key steps, each of which directly determines the quality and strength of the joint.

1) Preparation

  • Correctly overlap and place the layers of the materials to be joined.
  • Insert the SPR rivet into the press head of the riveting equipment.
  • Ensure that the anvil is tightly in contact with the material to provide support for the subsequent forming process.

2) Positioning and Piercing the Upper Layer

The rivet pierces the upper layer of material under high pressure. Important note: The rivet does not completely penetrate the lower layer of material but maintains a certain thickness to prevent damage to the material’s integrity.

3) Expansion & Mechanical Interlock

Under the constraint of the lower die, the tail of the rivet gradually expands outward.
After the tail expands, it “hooks” onto the lower layer of material, forming a stable mechanical interlock.
This process determines the shear strength and fatigue resistance of the joint.

4) Completion and Locking

The head of the rivet remains on the surface of the material, exerting a surface clamping force. The tail of the rivet is fully locked inside the material. Eventually, a permanent connection is formed without the need for additional fasteners or welding processes.

Key Process Parameters of the SPR Process

Advantages of SPR

The success of self-piercing riveting (SPR) is not only dependent on the performance of the equipment, but also on multiple key process parameters. If not properly controlled, it can easily lead to joint failure or material damage. The following four aspects are the most important:

a. Setting Force (Pressing Force)

  • Insufficient pressure applied → The rivet fails to fully expand, causing the joint to loosen.
  • Excessive pressure applied → The material may be crushed, especially for aluminum alloys or thin plate structures.
  • Therefore, in production, it is necessary to conduct process tests to find the appropriate pressure range. Data shows that the appropriate pressing force can increase the joint strength by 15%-20%.

b. Anvil Design

The shape of the lower die directly determines the expansion method at the tail end.
Conical, slot-shaped or specially designed lower dies will affect the expansion angle of the rivet tail end and the joint’s bite quality.
A correct lower die design can enhance the shear strength of the joint and reduce stress concentration.

c. Material Compatibility

  • SPR is particularly suitable for combinations of different materials, such as: aluminum + steel, galvanized steel + composite materials.
  • Different material combinations require different design of rivets and setting of pressing force.
  • In the automotive industry, the connection of aluminum + steel is a typical application of SPR, which can effectively reduce the weight of the entire vehicle while maintaining safety performance.

d. Rivet Design

The diameter, length and hollow depth of the nail body determine the expansion effect.
If the diameter is too small, the strength is insufficient; if the diameter is too large, the material is prone to damage.
Designing reasonable geometric parameters for the nail can ensure stable locking in multi-layer or high-strength materials.

SPR vs Other Joining Methods

Self-Piercing Riveting VS. Traditional Riveting
FeatureSelf-Piercing Riveting (SPR)Conventional RivetingWelding
Pre-drilled Hole RequiredNoYesNo
Heat Source RequiredNoNoYes
Suitable for Dissimilar MaterialsYesLimitedPoor
Installation SpeedFastSlowModerate
Surface QualitySmoothAverageWeld Spatter / Distortion
Automation CompatibilityHighMediumHigh

① Is pre-drilling required?

SPR does not require pre-drilling and eliminates the need for additional processes. Traditional riveting requires drilling holes, which makes the process quite complicated. Welding does not require drilling, but it may damage the surface coating.

② Is a heat source required?

SPR is a cold processing technique and does not require a heat source. Traditional riveting also does not require a heat source. Welding must rely on electricity or flames, which will create a heat affected zone (HAZ) and alter the properties of the metal.

③ The ability to be compatible with different materials

SPR is highly suitable for combinations such as aluminum + steel, galvanized steel + composite materials, etc.
Traditional riveting is limited in multi-material connections.
The welding performance on the connection with different materials is poor, and it is even impossible to achieve.

④ Installation Speed

SPR can complete locking in a single operation, and it is very fast.
Traditional riveting is slow because it requires drilling holes.
The welding speed is moderate, but it is highly dependent on the environment and the skills of the workers.

⑤ Appearance Quality

The SPR connection points are smooth and do not require additional grinding. Traditional riveting leaves behind the rivet heads and the appearance is usually unsightly. Welding is prone to slag and thermal deformation, and the post-processing procedures are complex.

⑥ Automation Compatibility

SPR is highly suitable for robots and automated production lines.
The traditional riveting process has a limited level of automation and relies heavily on manual operations.
Welding can be automated, but it has high energy consumption and poses significant safety risks.

Key Advantages of SPR Process

Self-piercing riveting (SPR) as an advanced mechanical connection method has been widely adopted in industries such as automotive, aerospace, and construction. Its advantages are not only reflected in the simplification of the process, but also in multiple aspects such as strength, efficiency, and environmental protection.

1. No need for pre-drilling → Enhances production efficiency

  • During installation, SPR does not require drilling, eliminating the need for additional processes.
  • Compared with traditional riveting, the production cycle can be shortened by 20% to 30%.
  • For large-scale assembly lines, this means higher production capacity and lower production costs.

2. High strength and durability → Excellent shear resistance and fatigue resistance properties

  • The SPR forms a mechanical interlocking structure, capable of withstanding high shear loads.
  • Under long-term vibration and impact conditions, the fatigue life of the joint is significantly better than that of spot welding.
  • Industry research indicates that the fatigue life of the SPR joint is 15%-25% higher than that of traditional spot welding.

3. Suitable for different materials → Aluminum + Steel, Galvanized Steel + Composite Materials

  • SPR can be easily connected with different material combinations.
  • It is particularly suitable for aluminum + high-strength steel in automotive manufacturing, or aluminum + composite materials in aerospace.
  • This feature solves the problems of low efficiency and unstable quality in welding connections between different materials.

Applications of SPR

4. Environmental protection and safety → No sparks, no smoke, low energy consumption

  • SPR is a cold processing technique.
  • It does not require an electric arc or flame, does not produce welding fumes, and does not damage the anti-corrosion coating.
  • It has lower energy consumption and higher safety, aligning with the green manufacturing trend.

5. Automated production-friendly → Easy to integrate into robotic production lines

  • SPR equipment can be seamlessly integrated with robots.
  • In the manufacturing of car bodies, SPR has become the mainstream choice for robotized assembly.
  • It has high consistency and can ensure the stability of mass production.

Limitations of the SPR Process

Although self-piercing riveting (SPR) performs exceptionally well in terms of lightweighting and connection between different materials, it is not a perfect process.

1. High initial equipment cost

Applications of SPR
  • SPR requires a specialized press riveting machine (hydraulic or servo-driven).
  • The equipment investment is much higher than that of traditional core pulling guns or welding equipment.
  • For large-scale production enterprises, the investment can be offset by increased production capacity, but for small and medium-sized enterprises, the upfront cost pressure is relatively large.

2. Not suitable for extremely thick or highly hard materials

  • SPR is suitable for sheet materials with a thickness ranging from 0.5mm to 3mm.
  • If the material is too thick or too hard, the rivets may not be able to penetrate completely, resulting in poor connection.
  • In such scenarios, traditional bolts or welding might be more appropriate.

3. Permanent connection （Not suitable for structures that need to be disassembled）

The joints formed by SPR are irreversible mechanical locking. Once installed, they cannot be easily disassembled or reused like bolts. If the product requires maintenance or frequent component replacement, SPR is not the best choice.

Applications of SPR in Industry

Self-piercing riveting (SPR) has been widely adopted in various industries due to its efficiency and material compatibility. Here are some typical cases:

Automotive Industry

SPR is the most prominent application in automotive lightweighting. Car manufacturers such as Tesla, Jaguar Land Rover, and BMW extensively use SPR in aluminum body manufacturing. Research shows that over 70% of aluminum bodies in the European market are produced using the SPR process.
Advantages: Enhances vehicle rigidity, reduces weight, and complies with energy-saving and emission standards.

Self Piercing Rivets for Automobile Compartment Assembly

Aerospace Industry

In aircraft manufacturing, SPR is often used for the structural connection of aluminum alloys and composite materials. Compared to welding, SPR avoids the problem of heat affected zone and can maintain the original mechanical properties of the materials.
Advantages: Enhances structural reliability and extends service life.

Appliances & Construction

In the home appliance industry, SPR is used for assembling coated steel plates in refrigerators, washing machines, etc. In the construction industry, SPR is applied to curtain walls and lightweight frameworks.
Advantages: High connection strength, does not damage the anti-corrosion coating, enhances product durability.

Rivmate Expertise & Solutions

As a professional brand in the field of fasteners, Rivmate can provide customers with comprehensive self-piercing riveting (SPR) solutions. Our products and services cover the entire process from rivet selection to process validation, helping customers achieve efficient and reliable production.

Characteristics of Rivmate SPR Rivets

application of self piercing rivet
  • Multiple material options available: Aluminum, stainless steel, carbon steel, suitable for various environments and strength requirements.
  • Wide range of Grip Options: Compatible with thin plates, multi-layer plates and connections of different materials.
  • Strictly compliant with standards: All products comply with the ISO 14589 and DIN 7337 international standards, ensuring consistency and reliability.

Support Provided by Rivmate

Process Evaluation and Testing: Based on the customer’s material combination and strength requirements, provide professional tests to ensure the best performance of the joints.

Automation Production Integration Support: Assist customers in seamlessly integrating SPR technology into robots or automated production lines.

Customized Solutions: Offer exclusive nail design and process optimization tailored for specific industries (such as automotive, aviation, construction).

FAQ

Q1: Is the self-piercing riveting process completely without any pre-treatment?

Answer: Basically, no pre-treatment is required. The SPR rivets can penetrate the upper layer material under high pressure. However, in some scenarios, it is still necessary to ensure that the material surface is clean and there is no excessive coating to guarantee the quality and long-term stability of the joint.

Q2: Can SPR replace welding?

Answer: In many scenarios involving lightweight and composite material connections, SPR has gradually replaced spot welding. For instance, in the combination of aluminum and steel, SPR performs better. However, in thick plates and heavy-load structures, welding still has its irreplaceable advantages. Therefore, whether it can be replaced needs to be determined based on specific applications.

Q3: Will the SPR process damage the galvanized coating?

Answer: SPR offers better protection for the galvanized layer compared to welding. Welding generates high temperatures, which can damage the anti-corrosion coating; while SPR is a cold processing method and does not cause a heat affected zone. However, at the punctured area of the rivet, the local coating may still suffer minor damage. Generally, this impact can be reduced by optimizing the design of the lower die or through subsequent protective treatments.

Q4: Does Rivmate offer a complete solution for SPR equipment?

Answer: Yes. Rivmate not only offers various specifications of SPR rivets, but also can recommend or assist in integrating compatible press riveting equipment according to customer requirements. We can also provide process debugging and training to ensure that customers can smoothly introduce the SPR process.

Unlock the Power of SPR with Rivmate

Self-piercing riveting (SPR) is an efficient, environmentally friendly, and suitable process for connecting different materials. Its core procedure is “penetration → expansion → locking”. With advantages such as no need for pre-drilling, high strength, suitability for different materials, and automation friendliness, SPR has become the mainstream choice in industries such as automotive, aviation, and construction.

Whether you are exploring lightweight solutions or looking for reliable methods for connecting different materials, Rivmate can provide you with complete SPR products and process support. We not only offer standardized rivets that comply with ISO 14589 / DIN 7337, but also provide process testing, equipment integration and customized solutions for your industry needs.

Contact Rivmate immediately to obtain the Self-Drilling Riveting Selection Guide, and choose the best solution for your project.

Reference

Overview of Self-piercing Riveting Process

What is self-piercing riveting and how does it work?

Types of Rivets

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Can Blind Rivets Be Self-Piercing?

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In the application of fasteners, many users may have such a question: “Can blind rivets be self-piercing?” Blind rivets and self-piercing rivets (SPR) have certain similarities in appearance and application scenarios, so they are often confused. Both can achieve single-sided operation and are used in structures where the back side cannot be accessed. However, this does not mean that they can be used interchangeably.

The core issue is: Does the blind rivet have the self-pushing function? Can it be used for two purposes with one rivet? This article will conduct an in-depth analysis from three aspects: structural principle, installation method, and application scenario.

What Are Blind Rivets?

What Are Zinc Plated Blind Rivets

Blind rivets are a common type of mechanical fastener. Their most notable feature is “single-sided installation”. This means that assembly can be completed even if the back of the structure cannot come into contact.

The working principle of blind rivets is very straightforward. During installation, first drill holes on the workpiece. Insert the rivet and then use a special riveting gun to pull the mandrel. The mandrel will force the rivet body to expand and compress the material. Eventually, the rivet is locked in the hole, the mandrel breaks and remains inside the rivet, forming a reliable connection.

Blind rivets have a wide range of applications. They are commonly found in electronic enclosures, sheet metal parts, household appliances and lightweight metal structures. These industries have high requirements for installation efficiency and cost control. Blind rivets do not require double-sided operation, the riveting tools are lightweight, the installation speed is fast, and therefore they are very popular in mass production.

In terms of material selection, blind rivets can be made of aluminum, steel, stainless steel, copper, etc. Different materials are suitable for different needs. For instance, aluminum-made blind rivets are lightweight and are suitable for the home appliance and electronics industries; stainless steel blind rivets have strong corrosion resistance and are more suitable for outdoor and humid environments. According to market data, in the sheet metal assembly and electronics industries, the usage proportion of aluminum-made blind rivets exceeds 50%.

It should be noted that blind rivets must rely on pre-drilled holes. If the hole diameter does not match the rivet diameter, or if the clamping force is insufficient, it may lead to loosening or even failure. Therefore, in engineering applications, choosing the appropriate hole size and adopting the correct installation process is of utmost importance.

What Are Self-Piercing Rivets?

The Self-Piercing Rivet (abbreviated as SPR) is an advanced mechanical connection method. Unlike blind rivets, it does not require pre-drilling. During the installation process, the rivet pierces the upper layer material under high pressure. Subsequently, the tail of the rivet expands in the lower layer material, thereby forming a secure mechanical lock.

The greatest advantage of this process is that it is suitable for the connection of different materials.  Traditional welding would encounter difficulties in such combinations, but SPR can ensure a high-strength connection without compromising the material properties.

Rivmate SPR Rivet(Self piercing rivet)

The application fields of SPR are very extensive. The automotive industry is the main market. With the trend of lightweighting, many car bodies adopt aluminum structures, and SPR has become an important process to replace spot welding. According to industry data, over 70% of aluminum body parts in high-end European cars are produced using the SPR process.

In the field of aerospace, SPR can efficiently connect aluminum alloys and composite materials, ensuring structural strength and reliability. In the construction and composite materials industry, SPR is also gradually being adopted for the manufacturing of curtain walls, lightweight steel structures, and new energy equipment.

SPR also has environmental benefits. It does not require a heat source, does not produce smoke or sparks, and does not form the “heat affected zone” commonly seen in welding. Therefore, SPR can maintain the original mechanical properties of the material while reducing energy consumption.

Can Blind Rivets Be Self-Piercing?

The answer is very clear: No.

Blind rivets and self-piercing rivets (SPR) both belong to the single-sided installation fastening methods, but their principles and processes are completely different. Blind rivets cannot achieve the self-tapping function. Each of them is designed for different application scenarios and cannot be interchanged.

a. Different structures

Self-Piercing Riveting VS. Traditional Riveting
Self-Piercing Rivets vs. Traditional Rivetis
  • The blind rivets must rely on the pre-drilled holes. Before installation, appropriate holes need to be drilled on the workpiece, and then the rivets can be inserted.
  • Self-piercing rivets have a special geometric structure. Under high pressure, they can directly pierce through the upper layer material and expand and lock in the lower layer material, without the need for pre-drilling holes.

b. Different Installation Methods

How to Install Pop Rivets ? - The Most Complete Guide
Install Blind Rivets
Self Piercing Rivets for Automotive - High Cost Self Piercing Rivets Tool
Install Self-Piercing Rivets
  1. Blind rivets are installed using a riveting gun or hand tools. The operation is simple, but the requirements for hole size accuracy and installation quality are high.
  2. SPR requires a dedicated high-pressure hydraulic press or servo riveting equipment. The equipment cost is higher, but it can ensure repeatability and connection strength.

c. Different Applicability of Materials

  • Blind rivets are more suitable for thin plates with pre-drilled holes, and are commonly used in lightweight structures and conventional metal assemblies.
  • SPR is specifically designed for un-drilled multi-layer materials or dissimilar materials (such as aluminum + steel, steel + composite materials), and is suitable for scenarios with higher requirements for strength and durability, such as in automobiles and aviation.

Why Are Blind Rivets and SPR Confused?

In the selection of fasteners, many users tend to confuse blind rivets with self-tapping rivets. This confusion is not surprising. The main reasons are as follows:

1) All are one-sided operations

Both can be installed without being able to access the back side. For the assembly workers, this “single-sided installation” feature is very similar.

2) Both can be used in thin plate scenarios

Applications of SPR
Applications of SPR

Blind rivets are commonly found in sheet metal parts and lightweight structures. SPR is also frequently used in the combination of aluminum alloy sheets or plates. When users actually assemble, they often find that their application scopes overlap.

3) All fall under the category of alternative welding or bolting methods

In modern manufacturing, riveting and SPR are both widely used as alternative solutions to welding and bolt connections. Both of them can, to a certain extent, reduce the complexity of the process and improve the assembly efficiency.

However, it must be emphasized that: Blind rivets ≠ Self-tapping rivets.

  • Blind rivets require pre-drilled holes, while SPRs do not need any pre-drilling at all.
  • Blind rivets are mostly used in conventional lightweight structures, while SPRs are specifically designed for high-strength and heterogeneous material connections.

Blind Rivets vs. Self-Tapping Rivets

Comparison Table: Blind Rivets vs. Self-Tapping Rivets

FeatureBlind RivetsSelf-Piercing Rivets (SPR)
Pre-drilled Hole RequiredYesNo
Installation MethodRivet Gun (Mandrel Pulling)Hydraulic/Servo Riveting Machine
Self-Piercing CapabilityNoYes
Suitable MaterialsMetals, Plastics, Thin SheetsMulti-materials, Aluminum + Steel, Layered Sheets
RemovabilityNoNo
Typical ApplicationsElectronics, Light Industry, AppliancesAutomotive, Aerospace, Construction

① Is pre-drilling required

  • The blind rivets must be drilled first before being installed.
  • The SPR directly pierces through the upper layer material without requiring any additional processes.

② Different Installation Methods

  • Blind rivets rely on pull-pin guns and are suitable for portable and lightweight operations.
  • SPR requires high-pressure riveting machines and is mostly used in automated production lines.

③ Differences in Self-Drilling Ability

  • Blind rivets cannot self-tap.
  • SPR is precisely because of its self-tapping feature that it performs exceptionally well in the connection of different materials such as aluminum and steel.

④ Different applicable materials

  • Blind rivets are suitable for thin sheets or plastic parts of a single material.
  • SPR is specifically designed for multi-layer and heterogeneous materials, making it more suitable for the trend of lightweight manufacturing.

⑤ Application Field Differences

  • Blind rivets are more commonly used in the fields of electronics, home appliances, and light industry.
  • SPR is mainly found in high-demand areas such as automobiles, aviation, and building structures.

When to Use Blind Rivets vs SPR

Applications of SPR
SPR Applied in Automobiles

Advantages of Blind Bolts

  • Low cost, suitable for large-scale use.
  • Easy installation, low operational threshold.
  • Portable tools, enabling rapid construction on-site.
  • Typical applications: electronic enclosures, home appliance assembly, furniture, lightweight metal parts.

Advantages of Self-Piercing Rivets (SPR)

  • High strength, with superior connection performance compared to traditional blind rivets.
  • Particularly suitable for dissimilar materials, such as aluminum alloy and steel.
  • Easy to integrate into automated production lines, resulting in higher efficiency.
  • Typical applications: automotive lightweight body, aerospace aluminum alloy and composite materials, building curtain walls, and new energy equipment.

How to Choose?

If the project requires low cost and easy installation → Choose blind rivets.
If the project requires high-strength or special material connections → choose self-tapping screws.

In high-end manufacturing industries such as automotive production, SPR has gradually replaced traditional welding and some riveting processes. Data shows that over 70% of aluminum body panels in the European market are produced using the SPR process.

Rivmate Expertise & Recommendations

Sizes of Rivmate Monobolt Rivets

In different projects, the choice of riveting method directly affects the structural performance and service life. Rivmate, as a professional fastener supplier, can offer a complete range of products including blind rivets and self-tapping rivets (SPR) to meet the diverse needs of customers.

1. Multiple material options available

The Rivmate products cover various materials such as aluminum, stainless steel and carbon steel.

  • Carbon steel → High strength, suitable for automobiles and structural components.
  • Aluminum → Lightweight, suitable for home appliances and electronics industries.
  • Stainless steel → High corrosion resistance, suitable for marine, construction and outdoor projects.

2. Adapt to different application requirements

Rivmate blind rivets are suitable for lightweight assembly and portable construction.
SPR is suitable for high-strength, multi-layered boards and connections between different materials. Whether in the manufacturing of household appliances or in the lightweight body structure of automobiles, there are matching solutions available.

3. Technical Support and Model Selection Guidance

The technical team of Rivmate has over 20 years of experience in fastener application. We not only offer standardized products, but also provide customized recommendations based on the customer’s working conditions. Through selection guidance and process evaluation, we help customers avoid quality or cost risks caused by choosing the wrong riveting method.

Therefore, if you are unsure whether to choose blind rivets or self-tapping rivets, Rivmate can offer you a one-stop solution to ensure that the performance of the fasteners and production efficiency achieve the optimal balance.

FAQ

Q1: Are there any blind rivets that can partially "self-tap"?

Answer: No. All blind rivets must rely on pre-drilled holes. This is the fundamental difference between them and self-tapping rivets.

Q2: Can the self-tapping rivet installation tool be used to install blind rivets?

Answer: No. The manufacturing processes and equipment for the two are completely different. Blind rivets are made using a pull core gun, while self-tapping rivets require hydraulic or servo riveting machines.

Q3: If I need lightweight and connection with different materials, which option should I choose?

Answer: Self-tapping rivets (SPR) are more suitable. They can achieve high-strength connections in multi-layer or heterogeneous materials such as aluminum and steel. According to industry data, in the manufacturing of lightweight automotive bodies in Europe, over 70% of aluminum parts are produced using the SPR process.

Q4: Can Rivmate provide a comparison and selection guide for blind rivets and SPR?

Answer: Yes. Rivmate not only offers standardized product catalogs, but also provides professional selection comparison tables and process recommendations based on actual working conditions, helping customers avoid incorrect usage.

Conclusion

Blind rivets cannot self-drive. They differ fundamentally from self-driving rivets in terms of installation principles, applicable materials, and strength performance. However, they also share some common points: both support single-sided operation and can provide reliable mechanical connections. In actual selection, the following aspects should be given priority consideration:

  • Is pre-drilling required?
  • Is the material of a heterogeneous or multi-layered structure?
  • What are the specific requirements for strength and durability?

Choosing the correct fastening method is essential to ensure the structural safety while optimizing the cost and assembly efficiency.

👉 Discover the Right Rivet Solution with Rivmate

Rivmate Rivet Factory in Jiangsu, China

Whether you are considering blind rivets or planning to adopt self-piercing rivets, Rivmate can offer you professional selection guidance and complete solutions. We not only have product series covering aluminum, stainless steel, and carbon steel, but also can provide customized process suggestions based on your industry requirements.

Contact us immediately to obtain the “Blind Rivets vs Self-Tapping Rivets Selection Guide”, and choose the best fastening solution for your project.

Reference

What Are Self-Piercing Rivets and How Do They Work?

What is self-piercing riveting used for?

Types of Rivets

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How Does a Self Piercing Rivet Work?

Table of Contents

In modern manufacturing, lightweighting and the application of multiple materials have become mainstream trends. The extensive use of aluminum, galvanized steel, and composite materials has posed challenges to traditional welding and riveting methods. These methods often fail to balance strength, efficiency, and consistency in appearance. At this point, the industry began to focus on a more advanced solution – Self-Piercing Riveting (SPR). Many engineers and manufacturers would ask: “How does a self piercing rivet work?” How does it achieve high-strength connections without the need for pre-drilling and welding?

This blog will provide an in-depth analysis of the working principle and application value of SPR from a professional perspective. We will gradually break down its core process flow and compare it with traditional riveting and welding to reveal the advantages of SPR in terms of efficiency, material compatibility and consistency.

What is a Self-Piercing Rivet?

Self-Piercing Rivets (SPR) are an advanced type of mechanical fastener. Their most distinctive feature is that they do not require pre-drilling. Under high pressure, the rivet can directly pierce through the upper layer of material and expand in the lower layer, thus forming a secure mechanical lock. The entire process is completed in one step, without the need for additional heat sources or pre-treatment.

Structurally speaking, self-piercing rivets are typically composed of three key parts:

Limitations of SPR
  • Head: Provides the insertion force and bearing surface to ensure a smooth appearance after connection.
  • Shank: Achieves the penetration function and bears the main mechanical strength.
  • Partially Hollow Tail: Expands during the forming process to create a mechanical lock, ensuring a reliable bond between different materials.

This structural design enables SPR to simultaneously possess the mechanical reliability of riveting and the high efficiency of automated production. Therefore, it has become a widely adopted high-performance fastening solution in the automotive manufacturing, aerospace, and home appliance industries.

How Does a Self-Piercing Rivet Work?

Advantages of SPR

The working process of a Self-Piercing Rivet (SPR) can be divided into four key steps, each of which ensures the reliability and efficiency of the connection:

Positioning

Before starting the riveting process, the rivets are placed on the surface of the materials to be joined. The equipment is usually a hydraulic or servo-driven riveting machine, which can precisely control the position and pressure. The positioning step is crucial because any deviation could cause the rivets to be skewed or poorly locked. On automated production lines, robotic arms can ensure repeatability accuracy, with common errors being less than ±0.1 mm.

Piercing Upper Layer

As the pressure increases, the head of the rivet penetrates the upper layer material. The key to this step lies in controlling the penetration depth. The SPR only penetrates the upper layer and does not completely pierce through the lower layer. This not only avoids hole leakage but also protects the integrity of the lower layer material.

Unlike traditional rivets, the tip of the SPR is specially designed (usually conical or semi-hollow), enabling plastic deformation without removing any material. This means no chip residue, which is more environmentally friendly.

Expansion in Lower Layer

When the tail end of the rivet enters the lower layer material, the shape of the lower mold (anvil) forces it to undergo radial expansion. The tail end expands and embeds into the lower layer material, forming a structure similar to a “hook”. This process ensures a tight fit between different materials, even for combinations such as aluminum + steel or galvanized steel + composite materials, maintaining high strength and stability.

The experiment has proved that the expansion process of SPR can form a “circular stress zone”, significantly enhancing the tensile and shear strengths.

Mechanical Interlock

Ultimately, the tail end of the rivet is completely locked to the underlying material, forming a permanent mechanical bond. Unlike welding, this locking process has no heat affected zone (HAZ) and does not cause changes in the metal structure or damage to the coating. Unlike traditional riveting, it also does not require double-sided operation or additional fasteners.

 SPR joint has excellent fatigue performance and can remain stable even in environments with vibration and impact. For instance, in the automotive body-in-white (BIW), the fatigue life of the SPR connection is typically 1.5 to 2 times that of spot welding.

The entire process requires no drilling, no heat source, and no additional fasteners. Compared to traditional methods, the SPR connection is more efficient and stable, and is particularly suitable for mixed assembly of aluminum, steel, and composite materials.

Key Advantages of SPR Process

In modern manufacturing, self-piercing riveting (Self-Piercing Riveting, SPR) has gradually become the mainstream alternative to traditional welding and riveting due to its unique process. Its advantages mainly lie in the following aspects:

Rivmate SPR Rivet(Self piercing rivet)

a. No need for pre-drilling

SPR can be directly connected onto the material. This eliminates the need for drilling, which not only enhances production efficiency but also reduces tool wear and maintenance costs.

b. Suitable for different materials

It can efficiently connect combinations such as aluminum + steel, galvanized steel + composite materials. In these scenarios, welding often poses technical difficulties, but SPR can maintain high strength and stability.

c. No Heat Affected Zone (HAZ)

SPR belongs to cold processing and does not cause any changes in the material’s structure, nor does it damage the coating. Compared to welding, it can better maintain the original strength and corrosion resistance of the material.

d. Automated-friendly

The SPR process is easy to integrate with robotic production lines. The single-point connection time is usually around 1 second, which is suitable for large-scale automated production, such as the manufacturing of automotive body panels.

e. High connection consistency

The process has a high degree of standardization, relying on equipment rather than human accuracy. Compared to traditional riveting, SPR significantly reduces human errors and ensures the consistency of connections in mass production.

SPR has been widely applied in industries such as automobiles, aviation and home appliances. It not only optimizes production efficiency, but also provides a reliable connection solution for lightweighting and multi-material design.

SPR vs Other Joining Methods

In the manufacturing industry, common connection methods include traditional riveting, welding and bolt connections. Compared with these processes, self-piercing riveting (SPR) demonstrates unique advantages, while also having its limitations.

① Conventional Riveting

Traditional riveting requires pre-drilling, which involves multiple steps and has low efficiency. SPR, on the other hand, can be directly pressed into the material, eliminating the drilling process and shortening the production time.

② Welding

Self-Piercing Riveting VS. Welding

Welding relies on heat sources, which can easily cause material deformation, residual welding slag and heat-affected zones. SPR does not require heat energy, avoiding these problems. At the same time, it is more environmentally friendly and has lower energy consumption.

③ Bolting

The bolts are detachable and suitable for scenarios requiring maintenance. However, in comparison, the SPR connection is lighter and faster, and is particularly suitable for large-scale, one-time, permanent assembly.

Table: Joining Methods Comparison

Comparison DimensionSelf-Piercing Riveting (SPR)Conventional RivetingWeldingBolting
Installation SpeedFast (≈1 second per point, suitable for automation)Slow, requires pre-drillingMedium, requires welding preparationSlow, requires tightening
Applicable MaterialsDissimilar materials (aluminum + steel, steel + composites)Mainly similar metalsMainly similar metals, limited with dissimilar materialsBroad, suitable for almost all materials
Appearance QualityFlat, neat, no spatterVisible holes, average appearanceLikely spatter and discoloration, requires post-processingBolts exposed, affects appearance
Joint StrengthHigh strength, excellent fatigue resistanceModerate, depends on operator skillHigh, but prone to cracking under fatigueHigh, and detachable
Environmental ImpactNo heat, low energy consumption, eco-friendlyProduces chips (drilling waste), moderate eco-friendlinessHigh energy consumption, sparks and fumesModerate, requires additional fastener production

Applications of Self-Piercing Rivets

With the continuous pursuit of lightweighting, multi-materiality and high efficiency in the manufacturing industry, self-piercing riveting (Self-Piercing Riveting, SPR) has been widely applied in various industries. Its technological advantages not only address the shortcomings of traditional welding and riveting, but also drive the development of new-generation structural designs.

  • Automotive Industry
    SPR is widely used in aluminum alloy vehicle bodies and lightweight frame structures. For instance, Tesla and Jaguar Land Rover extensively employ SPR in vehicle body manufacturing, using it for the connection of different materials such as aluminum and steel. This process not only ensures structural strength but also reduces the damage to the coating caused by welding, thereby extending the lifespan of the entire vehicle.

Applications of SPR
  • Aerospace
    SPR can achieve reliable connections between aluminum alloys and composite materials. Compared to welding, it avoids the heat affected zone (HAZ) and can better maintain the material properties and fatigue life. Therefore, SPR is often used in aircraft skins, hatches, and composite structural components.
  • Architecture and Household Appliances (Construction & Appliances)
    In scenarios such as building curtain walls and metal roofs, SPR can quickly connect coated steel plates and maintain the integrity of the anti-corrosion layer. In the manufacturing of household appliances (such as refrigerators and washing machines), SPR is widely used in the assembly of thin-walled metal parts, not only providing a beautiful appearance but also enhancing production efficiency.

Limitations of SPR

Although Self-Piercing Riveting (SPR) has significant advantages in terms of efficiency, compatibility with different materials, and integration of automation, it is not the best choice in all application scenarios. Understanding its limitations can help manufacturing enterprises make more rational decisions in their process planning.

  • Initial equipment cost is relatively high
    SPR requires a dedicated press-bending machine, usually with hydraulic or servo drive systems. Compared to traditional riveting or welding equipment, the initial investment is higher. For small and medium-sized manufacturers, they must consider the payback period of the investment.
  • Not applicable to extremely thick or extremely hard materials
    The penetration and expansion capabilities of SPR rivets are limited. For materials with excessive thickness or hardness, a reliable locking structure may not be achievable. In such cases, welding or bolt connections might be more appropriate.
  • Belongs to a permanent connection
    Once the SPR is formed, it is difficult to disassemble without damaging the material. Therefore, it is not suitable for applications that require frequent assembly, maintenance or component replacement. For example, in electrical equipment or mechanical systems with high maintenance requirements, threaded fasteners remain a more reasonable choice.

Rivmate Expertise & Solutions

SPR Solutions

As a professional supplier of fastening technology, Rivmate offers manufacturing enterprises a comprehensive range of self-tapping riveting (SPR) products and services. Its advantages are not only reflected in the performance of the rivets themselves, but also in the systematic ability to adapt the process and provide technical support.

Product Features of Rivmate SPR

  • Multiple material options available: Offer aluminum, stainless steel, and steel rivets to meet various material combinations and strength requirements.
  • Comprehensive Grip Range compatibility solution: Cover a wide range of thicknesses from thin sheets to multi-layer structures, ensuring flexibility in assembly.
  • Compliant with international standards: All products meet the ISO 14589 / DIN 7337 standards, ensuring consistency and compatibility with global supply chains.

Services provided by Rivmate

  • Process Evaluation and Selection Guidance: Based on material properties and structural requirements, recommend the most optimal rivet solution for customers.
  • Compatibility Support for Automated Production Lines: Ensure that SPR rivets can be seamlessly integrated with existing press riveting equipment and robotic production systems, reducing additional investment.
  • Customized Solutions: For special application scenarios, provide non-standard rivet design, small-batch prototyping and verification, enhancing the flexibility of customer R&D and production.

With the combination of standardized products + specialized services, Rivmate is not only a supplier of rivets, but also an important partner for enterprises to optimize assembly processes and enhance production efficiency.

FAQ

Q1: Can SPR replace welding?

It is possible in many scenarios. Especially in combinations of aluminum + steel, galvanized steel + composite materials, the reliability and consistency of SPR are often superior to welding. However, in thick plate steel structures or scenarios requiring extremely high load-bearing capacity, welding still has advantages. Therefore, SPR and welding are usually in a complementary relationship, rather than being completely substitutable.

Q2: Is SPR stronger than traditional rivets?

The strength performance varies depending on the application. SPR outperforms traditional riveting in terms of fatigue resistance, consistency, and automation efficiency, and does not rely on human accuracy. However, in some low-load and low-cost applications, traditional rivets are still sufficient. Therefore, SPR is more suitable for high-end manufacturing and mass production.

Q3: Is SPR suitable for the connection of aluminum and steel?

It is highly suitable. SPR is specifically designed for intermetallic material bonding, and can maintain high strength and durability in the aluminum + steel combination. Compared to welding, SPR does not damage the coating and does not create a heat affected zone (HAZ), thus better preserving the corrosion resistance.

Q4: Does Rivmate provide the SPR selection table and installation guide?

Yes. Rivmate offers standardized SPR selection tables, covering materials, Grip Range and application scenarios. It also provides installation guidelines and process consultation, helping customers achieve equipment compatibility and process optimization. For special requirements, Rivmate can also provide customized solutions.

Get Your SPR Solution with Rivmate Today

SPR workshop

Self-Piercing Riveting (SPR) has emerged as the preferred method for lightweighting and connecting dissimilar materials due to its advantages of being efficient, environmentally friendly, and reliable. It not only enhances production efficiency but also reduces energy consumption and subsequent processing costs. The application scope of SPR is expanding in industries such as automotive, aerospace, home appliances, and construction.

If you are looking for a better connection solution, Rivmate can offer you professional SPR selection tables, installation guidelines, and process evaluation support. Whether it’s standardized products or customized solutions, Rivmate can help your production achieve a more rapid, stronger, and greener upgrade.

📩 Contact Rivmate immediately to obtain exclusive SPR selection and process consultation services.

Reference

 An Overview of Self-piercing Riveting Process

What Are Self-Piercing Rivets and How Do They Work?

Types of Rivets

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What are the Key Advantages of Using Self-Piercing Rivets Compared to Traditional Rivets or Welding?

Table of Contents

In modern manufacturing, the trend of material diversity is becoming increasingly evident. Lightweight structures have led to the widespread use of aluminum, composite materials, and galvanized steel. However, these materials are often not suitable for traditional welding or ordinary riveting processes. This results in problems such as insufficient strength and damage to the heat-affected zone during assembly. Therefore, exploring more reliable and efficient connection methods has become an industry consensus.

This is precisely the background for the rapid rise of the Self-Piercing Rivets (SPR) technology. It does not require pre-drilling and does not rely on heat energy, enabling strong connections between different materials. Many automobile, aviation, and rail transportation manufacturers have listed it as their preferred process. So, what are the advantages of using self-piercing rivets compared to traditional riveting and welding? This article will deeply analyze why SPR technology has stood out in multiple manufacturing scenarios.

What is Self-Piercing Riveting?

Self-piercing riveting (SPR) is an advanced mechanical connection process. Its most significant feature is that it does not require pre-drilling. The rivet, under the action of hydraulic or servo pressure, directly penetrates the upper layer material and expands and forms in the lower layer material, ultimately achieving a reliable mechanical locking.

The process flow can be summarized into four steps: Compression → Penetration of the upper layer → Expansion → Locking. The entire process requires only one operation, which is highly efficient and stable.

Compared with traditional techniques, the differences are quite obvious:

Why Remove Self Piercing Rivets
  • Traditional Rivets: They require pre-drilling and usually require double-sided operation. The efficiency is low and it increases the process cost.
  • Welding: It belongs to a thermal processing method and will create a heat affected zone (HAZ), which may reduce the material strength and corrosion resistance. Especially for lightweight materials such as aluminum and galvanized steel, the welding effect is not ideal.
  • Self-Piercing Riveting (SPR): It can be completed in a single operation without pre-treatment and will not generate a heat affected zone. It can maintain connection strength and consistency in different material combinations.

For this reason, SPR has become a crucial connection technology in industries such as automotive, aviation and home appliance manufacturing, and is widely used to replace traditional riveting and welding processes.

Advantages of Self-Piercing Riveting over Traditional Riveting

Self-Piercing Riveting VS. Traditional Riveting

In modern manufacturing, efficiency and consistency are the core competitiveness. Self-piercing riveting (SPR) outperforms traditional riveting and is particularly suitable for industries that have higher requirements for production cycle and connection quality.

a. No Pre-Drilling Required

The SPR rivets can be directly pressed into the material. This eliminates the need for drilling steps, reducing process time and tool wear. Depending on the actual application, it can shorten the assembly time by 20% to 30%.

b. Single-Sided Access

Traditional riveting usually requires a two-sided cooperation, while SPR can be completed with just one side. It is particularly suitable for body closed cavities or complex structural components, significantly enhancing the design flexibility.

c. Faster Assembly Speed

The SPR equipment can be integrated with automated production lines, and the single-point riveting cycle usually lasts around 1 second. It is highly suitable for mass production, such as in the manufacturing of automotive body panels.

d. Consistent Quality

The SPR process is highly standardized and does not rely on manual drilling or precise riveting. The connection results are more stable and the defect rate is significantly reduced.

e. Weight Reduction

SPR rivets are usually lightweight and support multi-material connections. For the automotive and aerospace industries, this means that while maintaining strength, they can further meet the requirements of lightweighting and energy conservation.

Advantages of Self-Piercing Riveting over Welding

Self-Piercing Riveting VS. Welding

Self-piercing riveting (SPR) offers a more flexible and reliable solution. Its main advantages are as follows:

Suitable for joining of dissimilar materials

SPR can easily achieve connections of aluminum + steel, galvanized steel + composite materials, etc. In these scenarios, welding is difficult and often results in insufficient strength or unstable performance.

No Heat Affected Zone (HAZ)

Since no heating is required, SPR avoids the problems of metal structure changes and strength reduction. For galvanized steel, it can also maintain the integrity of the anti-corrosion coating and extend the service life of the material.

Eco-Friendly & Safer Process

The SPR process features no sparks, no gases, and no welding wires, making it safer to operate. Moreover, its energy consumption is lower than that of the welding process, aligning with the manufacturing industry’s goals of carbon reduction and sustainable development.

Better Finish & Consistency

No welding slag, splashing or burn marks will be produced. The connection points will be smoother and more aesthetically pleasing, with higher assembly consistency, reducing the need for subsequent grinding and surface treatment.

Improved Fatigue Resistance

The welding points are prone to cracking under long-term vibration or impact conditions. The SPR connection, however, demonstrates better fatigue resistance and is more suitable for dynamic working environments such as those in automobiles and aviation.

Comparison Table: Self-Piercing Riveting vs Welding

Comparison DimensionSelf-Piercing Riveting (SPR)Welding
Dissimilar Material JoiningCan join aluminum, steel, and composites; highly versatileLimited in most cases; aluminum + steel combinations are difficult
Heat Affected Zone (HAZ)No heat effect, no material deformation or strength reductionHeat affected zone present; may cause structural changes and strength loss
Coating ProtectionPreserves coatings, offering better corrosion resistanceCoatings often damaged, increasing corrosion risk
Eco-Friendliness & SafetyNo sparks, low energy consumption, safer; aligns with carbon reduction goalsHigh energy consumption, sparks, fumes, and safety risks
Appearance & ConsistencyClean joints, no spatter, higher quality consistencyRequires post-processing, appearance may be uneven
Fatigue PerformanceExcellent fatigue resistance, suitable for vibration environmentsProne to cracks, poorer long-term durability

Limitations of SPR

Although self-tapping riveting (SPR) is widely used in industries such as automobiles, aviation, and home appliances, its application still has certain limitations. Understanding these limitations can help enterprises make more rational and cost-effective decisions when choosing processes.

High Initial Investment

SPR requires dedicated press-bolt joining equipment, usually a hydraulic or servo-driven system. Compared with traditional riveting or welding, the equipment cost is higher and the initial investment pressure is greater. Small and medium-sized manufacturers need to assess the payback period when introducing this technology.

Not Suitable for Very Thick or Ultra-Hard Materials

The penetration and expansion depth of SPR rivets are limited. For materials with a thickness or hardness exceeding a certain level, reliable locking may not be achievable. In such cases, welding or mechanical fasteners are still typically required.

Permanent Joint

Once the SPR connector is formed, it is difficult to disassemble without damaging the material. Therefore, it is not suitable for products that require frequent assembly and maintenance. For example, in some electrical equipment or replaceable components, threaded fasteners are still a better choice.

To sum up, self-tapping riveting is not a universal solution. It excels in lightweighting, multi-material applications, and batch production, but enterprises still need to consider factors such as material properties, production scale, and maintenance requirements, and conduct a comprehensive assessment before implementing it.

Applications in Industry

Self-tapping riveting (SPR) has been widely adopted by multiple industries. It addresses the limitations of traditional welding and riveting in terms of lightweighting, multi-materiality, and corrosion resistance. Here are some typical application scenarios:

  • Automotive Manufacturing
    SPR is widely used in aluminum body panels and lightweight frames. Car manufacturers such as Tesla and Jaguar Land Rover all adopt SPR to achieve multi-material connections of aluminum and steel, and to enhance the strength and durability of the vehicle body.
  • Aerospace
    SPR can connect aluminum alloys with composite materials. Such combinations are particularly common in aircraft skins, hatches and structural components. Compared with welding, SPR avoids thermal influence and enhances fatigue life.

Applications of SPR
SPR Used in Automotive Manufacturing
  • Appliances and Construction
    In household appliances such as refrigerators and washing machines, SPR can efficiently connect thin sheet metals with coated steel plates while maintaining the surface integrity. The construction industry also employs SPR in areas like curtain walls and metal roofing to enhance construction speed and reliability.

Application Case Comparison Table

IndustryKey ChallengesSPR Solutions
Automotive ManufacturingDifficulties in aluminum + steel hybrid joining; welding easily damages protective coatingsSPR enables high-strength joining without welding, maintaining corrosion resistance
AerospaceAluminum alloy + composite materials cannot be efficiently welded; high fatigue life requirementsSPR provides stable mechanical locking, enhancing fatigue performance
Appliances & ConstructionThin sheet metals and coated steels are prone to deformation or corrosion; high efficiency requiredSPR avoids heat effects, preserves coating integrity, and improves production efficiency

Rivmate Expertise & Solutions

In the context of the continuous expansion of self-tapping riveting (SPR) applications, Rivmate has emerged as a reliable partner for manufacturing enterprises, thanks to its comprehensive product line and technical support. Its advantages are not only reflected in the performance of the rivets themselves, but also in its systematic process integration capabilities.

Main features of Rivmate self-tapping rivets:

  • Multiple material options: Offers steel, stainless steel, and aluminum alloy rivets, meeting the requirements for different material combinations and strength.
  • Wide range of Grip Options: Suitable for connecting plates of various thicknesses and layers, ensuring process flexibility.
  • Compliant with ISO and DIN international standards: Ensures product consistency and reliability, suitable for cross-border supply chain applications.

The value-added services that Rivmate can offer to customers:

Rivmate - nashville fastener fair USA 2025
  • Process Consultation and Selection Support: Based on material properties and structural requirements, assist customers in choosing the optimal riveting solution.
  • SPR Equipment Compatibility Solutions: Ensure that the rivets are compatible with existing press riveting equipment, avoiding redundant investment.
  • Customized Riveting Services: For special applications, support the development of non-standard rivets and small-scale trial production to accelerate product verification and introduction.

By integrating standardized products with professional technical support, Rivmate not only offers rivets, but also provides system solutions. This enables customers to gain long-term competitive advantages in areas such as improving assembly efficiency, ensuring connection quality, and reducing maintenance costs.

FAQ

Q1: Is SPR stronger than welding?

It is not solely determined by the “strength” single indicator. SPR outperforms welding in terms of intermetallic bonding, fatigue performance, and appearance consistency. Especially in the combination of aluminum and galvanized steel, SPR is more reliable than welding. However, in some thick plate steel structures, welding still has a higher load-bearing capacity.

Q2: Can SPR completely replace traditional riveting?

This is not the case. SPR is suitable for automated, large-scale, and multi-material application scenarios. Traditional riveting still has advantages under the conditions of low cost, small batch production, and disassemblability requirements. Therefore, the two are complementary in the manufacturing industry, rather than completely substituting for each other.

Q3: Can SPR be applied to composite materials?

Sure. SPR is widely used in the structures of aluminum alloys + composite materials, such as aircraft skins and car bodies. It can prevent the composite materials from being damaged during high-temperature welding. However, the appropriate type of rivets and pressure parameters need to be selected based on the laminated structure of the composite materials.

Q4: Can Rivmate provide a selection chart for SPR rivets?

Sure. Rivmate offers a standardized bolt selection guide, covering aspects such as material, Grip Range, and application scenarios. Customers can also receive customized selection support to ensure that the riveting solution is highly compatible with the production process.

Get Your Rivmate SPR Selection Guide Today

Self-Piercing riveting (SPR) has become a cutting-edge joining technology in modern manufacturing due to its efficient assembly, ability to connect different materials, environmental friendliness and low energy consumption, as well as high consistency. Especially in industries such as automobiles, aviation, home appliances and construction, SPR demonstrates advantages that traditional riveting and welding cannot match. With the development of lightweighting and multi-material trends, the application scope of SPR is expected to continue to expand.

Rivmate SPR Rivet(Self piercing rivet)

Looking for the best self-piercing riveting solution for your project? Contact Rivmate immediately to obtain our professional self-piercing rivet selection guide and communicate with our technical team. Whether it’s material assessment, equipment compatibility, or customized rivet design, Rivmate can provide you with efficient, reliable, and internationally compliant solutions.

📩 Contact Rivmate immediately to make your manufacturing process lighter, faster and stronger.

Reference

What Are Self-Piercing Rivets and How Do They Work?

What is self-piercing riveting (SPR) and how does it work?

Types of Rivets

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What is Self-Piercing Riveting?

Table of Contents

What is self-piercing riveting? As materials become increasingly diverse, traditional welding or bolt connections often fail to meet the demands for both lightweight and strength. Especially in applications involving aluminum alloys, high-strength steel, and multi-layer composite materials, issues such as heat affected zones, additional hole processing, and fatigue life have gradually exposed limitations. Companies began to seek more efficient and reliable alternative processes.

Self-Piercing Riveting (abbreviated as SPR) is precisely an innovative connection technology that conforms to this trend. It does not require pre-drilling or additional heating. Instead, it can complete the connection in a single pressurization process through specially designed rivets and molds. Nowadays, SPR has been widely applied in industries such as automobiles, aviation, and home appliances.

What is Self-Piercing Riveting?

Self-Piercing Riveting (abbreviated as SPR) is an advanced mechanical connection technique. Its most significant feature is that it does not require pre-drilling. The self piercing rivets are pressed directly into the material under high pressure, penetrating the upper layer of the material and expanding and deforming in the lower layer, thereby achieving reliable mechanical locking. The entire process does not rely on heat energy and does not cause the common heat-affected zone problems seen in welding, making it particularly suitable for the connection of aluminum alloys, high-strength steels, and multi-layer composite materials.

The principle of its process can be simplified into the following four steps:

  1. The rivets are pressed into the surface of the material under high pressure;
  2. They penetrate the upper layer of the material but do not penetrate the lower layer;
  3. They expand in the lower layer of the material, forming an anchoring deformation;
  4. A permanent connection is achieved, with excellent tensile and shear strength.

The following is the schematic diagram of the SPR process (example):

schematic diagram of the SPR process

The key advantage of this process lies in its high efficiency and consistency. The installation cycle of a rivet is usually less than 1 second, making it suitable for automated production lines. According to automotive industry research data, the use of SPR can reduce the weight of the vehicle body by 5% – 10%, while maintaining or even enhancing the structural strength.

Advantages of SPR

Advantages of SPR

Self-Piercing Riveting (SPR) has rapidly gained popularity in the automotive, aerospace and home appliance manufacturing industries, and is gradually replacing some traditional welding and bolt connection methods. Its advantages are not only reflected in efficiency and cost, but also in the significant improvement of material compatibility and product performance. Here are the six core advantages:

1. No Pre-Drilling Required

The traditional bolt or riveting process requires pre-drilling, which increases the number of steps and time. SPR, however, does not require pre-drilling. The rivets are directly pressed into the material under high pressure and the locking is completed.

  • Fast production cycle: Installing a single SPR rivet typically takes less than one second;
  • Reduction of equipment wear: Avoiding the wear of cutting tools caused by drilling;
  • Less material waste: No scrapping due to errors in hole positions.

2. Material Flexibility

Welding usually requires that the materials have similar compositions and thicknesses; otherwise, cracks or joint failures are likely to occur. SPR has an advantage in this regard:

  • Different Material Connection: Can easily connect combinations with high welding difficulty such as aluminum + steel, aluminum + magnesium, and aluminum + composite materials;
  • Multi-layer Structure: Can achieve a firm connection of up to 3-4 layers of stacked materials;
  • Support for Lightweighting Trend: The proportion of aluminum body panels is expected to exceed 30% by 2025 (source: IHS Markit), and SPR precisely meets this demand.

Advantages of SPR

3. High Strength and Durability

The SPR connector has been precisely designed and possesses excellent mechanical properties:

  • Shear resistance and peel resistance are higher than those of spot welding;
  • Longer fatigue life: Under repeated loading conditions, the joint’s lifespan can be increased by 20% – 30%;
  • Stronger corrosion resistance: Due to the absence of welding heat affected zone, the material coating remains intact.

4. Eco-Friendly Process

Compared with welding, SPR has more advantages in terms of energy consumption and environmental impact:

  • No need for arcs or sparks, enhancing workshop safety;
  • Energy saving: Energy consumption is approximately 30% lower than that of resistance spot welding;
  • Reduced emissions: No welding smoke or ozone is produced, improving the working environment;
  • Compliance with environmental protection: Compliant with EU RoHS and automotive industry sustainable development requirements.

5. Automation Ready

SPR is highly suitable for automated production lines:

  • Easy integration of robots: The riveting equipment can be installed on a six-axis robot to enable multi-angle operations;
  • High consistency: The installation depth and expansion angle of each rivet are all controlled;
  • High efficiency: In the body shop, one production line can install tens of thousands of SPR rivets, with efficiency not inferior to spot welding.

6. Aesthetic & Consistent Finish

The joint surface formed by SPR is smooth and free of heat marks, and has excellent appearance consistency:

  • No need for secondary polishing: Eliminates the post-processing of solder joints;
  • Surface coating remains intact, facilitating subsequent spraying or electrophoretic processes;
  • Stable quality: Reduces appearance defects caused by variations in operators.

Limitations of SPR

Although self-piercing riveting (SPR) has advantages such as high efficiency, environmental friendliness, and compatibility with multiple materials, there are still certain limitations in practical applications, which require enterprises to make trade-offs when selecting types and planning processes.

High investment cost of the equipment

SPR requires specialized riveting equipment and dies. Compared with spot welding, the initial investment is higher, especially in vehicle assembly lines or large-scale production lines, where the equipment cost may amount to several million dollars. Although the operating cost is lower in the long run, the financial threshold is relatively high for small and medium-sized manufacturing enterprises.

Not suitable for super thick or high-hardness materials

Limitations of SPR

SPR is more suitable for thin plates and medium-thickness materials (typically 0.5 – 4 mm). When the material is too thick or has a high hardness, the rivets may not fully expand, resulting in a decrease in connection strength. This limits its application in heavy machinery and thick plate structures.

Permanent connection, not easy to disassemble

Once an SPR joint is formed, it is a permanent mechanical lock. Compared with bolt connections, it cannot be easily disassembled or reassembled. If the product requires regular maintenance or replacement of parts, SPR is not the best choice. This is also an important factor that some manufacturers need to consider in the assessment of maintenance accessibility and life cycle cost.

Comparison with Other Joining Methods

In modern manufacturing, common joining methods include welding, traditional riveting and bolted connections. Self-piercing riveting (SPR), with its high efficiency, lightweight and environmental-friendly features, has demonstrated obvious advantages in certain applications. However, different processes have their own applicable scopes, and a comprehensive selection should be made based on material, structure and maintenance requirements.

Compared with Welding

Overview of Welding Technology
  • SPR does not require a heat source and does not produce a heat-affected zone (HAZ), thus maintaining better mechanical properties of the material.
  • It can connect materials that are difficult to weld, such as aluminum alloys and high-strength steels.
  • It is more suitable for parts with coatings or surface treatments as it does not damage the coating.

Compared with Conventional Riveting

  • SPR does not require pre-drilling, offering a faster process and shorter production cycle.
  • Locking can be achieved in a single stamping operation, reducing the number of procedures.
  • It avoids the problem of material stress concentration caused by drilling.

Monel Blind Rivets - Buy High Quality Monel Rivets from Rivmate

Compared with Bolting

  • SPR is lighter in weight, does not require nuts and washers, and is suitable for lightweight design.
  • Installation is faster, eliminating the need for tightening and preload force detection steps.
  • However, bolts are detachable, while SPR provides a permanent connection.

Comparison Table: Self-impacting Riveting vs. Welding vs. Bolt Connection vs. Traditional Rivets

Characteristic / ProcessSelf-Piercing Riveting (SPR)WeldingBolted JointConventional Riveting
Requires Pre-Drilled HoleNoNoYesYes
Requires Heat SourceNoYesNoNo
Applicable MaterialsMultiple (e.g., Aluminum + Steel, Composites)Best with Similar MaterialsAlmost All MaterialsMultiple Materials, but Drilling Required
Strength PerformanceHigh Shear & Peel StrengthHigh, but May Decrease Due to HAZHigh (Depends on Bolt Grade)Moderate
ServiceabilityPermanent, Non-RemovablePermanent, Removal Requires CuttingRemovable, ReusablePermanent
Weight PerformanceLightweight, No Nuts/Washers NeededRelatively Light, Local Reinforcement at WeldHeavier, Requires Additional ComponentsHeavier, Uses Solid Rivets
Production EfficiencyVery High, ~1 sec/pointHigh, but Process DependentModerate, Torque Control RequiredModerate, Requires Drilling + Riveting
Environmental PerformanceNo Smoke/Sparks, Low Energy ConsumptionHigh Energy Use, Smoke and Sparks PresentNeutralNeutral

Applications of SPR

Applications of SPR

Self-Piercing Riveting (SPR) has been widely adopted in various industries due to its efficiency, environmental friendliness and compatibility with multiple materials. Here are three typical application scenarios:

Automotive Industry

SPR plays a crucial role in the trend of automotive lightweighting. The combination of aluminum alloy and high-strength steel is the core for reducing the weight of the vehicle body, and SPR can achieve stable and reliable connections between different materials.

  • Whole vehicle application: Brands such as Tesla, Jaguar Land Rover, and BMW have widely adopted SPR technology.
  • Application areas: Lightweight components such as body frames, doors, engine covers, and luggage compartment covers.
  • Industry data: According to the European Automobile Manufacturers Association (ACEA), using SPR technology can reduce the weight of the vehicle by 5% to 10%, while maintaining or improving crash safety.

Applications of SPR

Aerospace

In the aerospace field, the material combinations are more complex, often involving a multi-layer structure of composite materials + aluminum alloys + titanium alloys. SPR has provided a reliable solution for this.

  • Advantage: Avoid thermal damage to the composite material caused by welding; maintain interlayer strength.
  • Application scope: Lightweight structures such as fuselage skins, hatches, and wing panels.
  • Industry trend: Manufacturers like Boeing and Airbus are gradually testing SPR to replace some traditional mechanical fasteners, reducing assembly time and maintenance costs.

Construction & Appliances

SPR is not only applicable to high-end manufacturing, but also has been adopted in the construction and home appliance industries.

  • Construction Field: Used for rapid installation of steel plate roofs, curtain walls and metal frames. SPR can penetrate galvanized steel plates and coated plates while maintaining the anti-corrosion performance.
  • Appliance Field: Widely applied in thin plate connections of products such as refrigerators, washing machines and air conditioners.
  • Value Enhancement: Improves assembly efficiency, reduces coating damage caused by hot welding, and enhances appearance quality.

Self-tapping riveting is not only a key technology for automotive lightweighting, but is also expanding to various industries such as aerospace, construction, and home appliances. As the demand for different materials, high strength, and environmentally friendly processes continues to increase, the application scope of SPR will continue to expand.

Rivmate Expertise & SPR Solutions

As a professional supplier specializing in mechanical fastening technology, Rivmate has accumulated rich experience in self-tapping riveting (SPR) field. The company not only offers various specifications of SPR rivets, but also can customize overall solutions for customers, helping enterprises enhance production efficiency and product performance.

a. Varied Selection of Rivets

SPR Solutions

Rivmate supplies SPR rivets in various materials such as aluminum, stainless steel and high-strength steel. Different materials can meet various requirements including lightweighting, corrosion resistance and high strength, ensuring suitable options for industries such as automotive, aviation and home appliances.

b. Process Optimization and Automation Support

Rivmate is not only a supplier of rivets, but also offers process optimization suggestions. The engineering team can recommend the best riveting solution based on the material characteristics and product structure of the customers. At the same time, Rivmate supports automation line integration, helping customers quickly transition from experimental verification to mass production.

c. Strict Standards and Quality Assurance

All Rivmate SPR fasteners strictly adhere to international standards such as ISO, DIN, and IFI. They have undergone rigorous testing in terms of dimensional tolerance, mechanical properties, and durability, ensuring that each joint is reliable and consistent.

d. Customized Engineering Services

Rivmate offers a complete process support ranging from engineering selection to customized solutions. Customers can enjoy services such as material testing, sample verification, and connection strength assessment, ensuring the optimal match between the rivets and the process. This “one-stop” service significantly shortens the development cycle and reduces potential production risks.

FAQs on Self-Piercing Riveting, SPR

Q1: What is the main difference between self-tapping riveting and traditional riveting?

Traditional riveting usually requires pre-drilling, followed by inserting and securing solid or hollow rivets. Self-tapping riveting (SPR) does not require pre-drilling. The rivets penetrate the upper layer material under high pressure and expand to form in the lower layer. This means that the SPR process is faster and more efficient, while also reducing the weakening of the material caused by drilling.

Q2: Is SPR suitable for the combination of aluminum and steel, or steel and steel?

Yes. SPR is highly suitable for cross-material bonding, especially for the combination of aluminum and high-strength steel, which is a typical requirement for lightweight automotive bodies. At the same time, SPR is also applicable to steel + steel and aluminum + aluminum connections. Industry data shows that in aluminum + steel joints, SPR can maintain excellent shear strength and fatigue resistance, and is more consistent than welding.

Q3: Is SPR stronger than welding?

It depends on the specific application. SPR joints typically outperform spot welding in terms of peel strength and fatigue life, but in some thick plate welding scenarios, welding may be more suitable. The advantage of SPR lies in the absence of a heat-affected zone (HAZ), and the material properties are not damaged by heat. Therefore, it often performs better in the fields of aluminum alloys and composite materials.

Q4: Can the SPR process completely replace welding?

At present, SPR cannot fully replace welding. The reasons are as follows:

  • For extremely thick or highly hard materials, SPR is difficult to achieve effective connection;
  • In some structural components, welding still has cost and strength advantages;
  • SPR is more suitable for the connection of lightweight car bodies, thin plates, and multi-layer heterogeneous materials.

Therefore, in actual manufacturing, multiple processes are often combined. For instance, in the manufacturing of car bodies, SPR is frequently used in conjunction with spot welding and bonding to balance strength, efficiency and cost.

Unlock the Future of Lightweight Manufacturing with SPR

Self Piercing Rivets Factory In China

Self-tapping riveting (SPR) has become an important trend in modern manufacturing. It does not require pre-drilling and does not rely on heat sources, enabling efficient connection of dissimilar materials such as aluminum alloys and steel. In the automotive, aerospace, construction, and home appliance industries, SPR is gradually replacing traditional welding and bolted connections. Its advantages lie in lightweighting, high strength, environmental friendliness, and compatibility with automation, bringing higher production efficiency and product value to enterprises.

If your enterprise is in search of a more reliable and efficient connection process, Rivmate can provide you with comprehensive support. From nail selection, process optimization to integration of automated production lines, our engineering team can tailor solutions specifically for you.

👉 Contact Rivmate immediately to obtain the SPR selection guide, or communicate directly with the engineering team to explore the self-tapping riveting solution that is most suitable for your product.

Reference

What is self-piercing riveting and how does it work?

What Are Self-Piercing Rivets and How Do They Work?

Types of Rivets

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Blind Rivets Offer a Number of Advantages over Threaded Bolts

Table of Contents

In the modern manufacturing and assembly fields, fasteners are indispensable core components. They determine the strength, reliability and assembly efficiency of structures. With the increasing demands for lightweight and efficient production, engineers constantly compare the pros and cons of different fastening solutions. In this process, the advantages of blind rivets over thread bolts have become the focus of industry attention.

Why do engineers increasingly prefer blind rivets over bolts in more and more scenarios? The answer lies not only in their significant reduction of assembly time but also in their adaptability to single-sided operation environments. According to statistics, the use of blind rivets can increase assembly efficiency by approximately 20% to 30%, while reducing rework rates and inventory complexity. These advantages have made blind rivets gradually become the preferred alternative to bolts in industries characterized by rapid iteration, cost sensitivity, and precise assembly.

What Are Blind Rivets?

Blind rivets are a type of single-sided mechanical fastener. Unlike bolts, they can secure the object without needing to come into contact with the back side of the workpiece. This characteristic makes them an ideal solution for addressing “unreachable backside” assembly problems.

Basic Structure

Blind rivets are mainly composed of two parts –

Head: Forms the final locking surface and provides stable clamping force.
Mandrel: Breaks during installation, pushing the head to expand and achieving fastening.

During installation, the operator only needs to use a special pull riveting gun. After inserting the rivet into the workpiece from the front, pull the core shaft to cause the cap to expand. Once the core shaft breaks, a permanent and reliable connection is formed. The entire process is fast, simple, and does not require thread processing.

What Are Zinc Plated Blind Rivets

Typical Application Industries:

  • Aerospace: Assembly of structural components, requiring lightweight and high strength.
  • Automobile manufacturing: Body panels, exhaust systems, etc., often accompanied by vibrations and thermal expansion.
  • Construction engineering: Metal curtain walls, steel structure joints, suitable for large-scale installation.
  • Electronic enclosures: Suitable for fixing thin sheet metals or plastic parts.
  • HVAC systems: Connections of ducts and enclosures, fast installation, suitable for batch construction.

According to market research data, blind rivets account for approximately 12-15% of global fastener applications, and their demand is still steadily increasing. The reasons for this are their high assembly efficiency, low maintenance costs, and strong reliability. This also explains why more and more manufacturers prioritize blind rivets over traditional bolt solutions during the design stage.

What Are Threaded Bolts?

A bolt is a mechanical fastener that requires two-sided contact. It is usually used in conjunction with a nut and achieves clamping and fixation through the engagement of threads. Compared to blind rivets, it requires both sides of the workpiece to be in contact, and thus requires more installation space.

Main Features

Threaded Bolts
  • Removable: The bolt connection can be disassembled and reassembled during subsequent maintenance.
  • Reusable: Under conditions where force is permitted, the bolt can be used repeatedly.
  • Requires Torque Control: During installation, a tool must be used to apply the appropriate torque to ensure accurate tightening force.
  • Reliable Load-bearing: Suitable for high-load and long-term usage scenarios.

Common Application Scenarios:

  • Heavy machinery: Such as engineering equipment and mining machinery, must withstand high impacts and continuous loads.
  • Structural engineering: In bridges and steel structures, bolts are the key load-bearing components.
  • Large-scale assembly: Such as wind power equipment and ship manufacturing, require maintainability and replaceability.

According to industry data, bolts account for over 40% of the global fastener market. This is because they have strong load-bearing capacity and high maintainability. However, they have certain limitations in terms of installation efficiency and space compatibility.

Core Advantages of Blind Rivets over Threaded Bolts

Blind rivets have more advantages in terms of single-sided installation, cycle efficiency, weight reduction, anti-loosening, overall cost and appearance. They are suitable for scenarios where the backside is inaccessible, the production line cycle is tight, and weight reduction is critical.

① Single-Sided Installation

Q Rivets Installation
  • Just perform the operation on the front side. There is no need to hold the back nut or enter the sealed cavity.
  • This is particularly crucial for structures that are difficult to access. Such as closed profiles, boxes, interlayer panels, air ducts and vehicle interior.
  • Typical comparison: At the same position, using bolts requires two people (one to tighten on the front side and the other to support on the back side). Blind rivets can be completed by one person.
  • Result: Reduces collaborative work at the workstation and rework. Reduces on-site safety risks (fewer entries into narrow spaces).

② Faster Installation Process

  • The blind rivets are installed in a single pull riveting operation. No torque wrench, stall control or secondary recheck is required.
  • Production line cycle comparison (typical range):
    • Blind rivets: 2 – 4 seconds per point (depending on hole preparation and part retrieval and placement).
    • Screws + nuts: 8 – 20 seconds per point (part retrieval, hole alignment, gasket placement, hand tightening, torque application, recheck).
  • Rough calculation: Each point saves 6 – 16 seconds. Assuming an hourly labor cost of $25, for each product with 100 points, direct labor savings can be $4.2 – $11.1 per piece (excluding quality inspection and rework). This is more significant for large-scale assembly lines.

③ Lightweight Solution

  • Under the same clamping force and structural stiffness, the blind rivet assembly is significantly lighter than “screw + nut + washer”.
  • Example: Common 4.8 mm aluminum blind rivets are approximately 0.5 – 0.8 g per point; M5×12 carbon steel screws + nuts + washers are approximately 4 – 5 g per point.
  • The weight reduction can be 70 – 90% (depending on the material and size).
  • For automotive, rail transit and aviation interior applications, there are quantifiable benefits in terms of vehicle/whole-machine energy consumption and range.

④ Excellent Vibration Resistance

  • The bolt’s vibration resistance relies on frictional preload. It may loosen under long-term vibration and requires spring washers, nylon locking, thread sealant or secondary inspection.
  • The blind rivets become permanently locked after forming. There is no problem of thread slippage.
  • In the body panels, exhaust insulation plates, HVAC ducts, and equipment covers, blind riveting connections are more stable and quieter under high-frequency and low-amplitude vibration conditions.

⑤ Cost Efficiency

  • Fewer parts: The blind rivets are single pieces. The bolt system usually includes bolts, nuts, washers, and even anti-loosening devices.
  • Shorter assembly steps: Fewer parts to take, less alignment, no torque tools or calibration required.
  • Easier inventory management: Fewer SKUs, lower obsolescence and mismatch risks.
  • Rough TCO formula:
    • Total cost = (fastener unit price) + (installation time × labor cost) + (quality inspection/retirement) + (inventory holding) + (tool depreciation/calibration).
    • Blind rivets often offset the price difference with lower installation and quality inspection costs, and are more cost-effective throughout the entire life cycle.

⑥ Clean Finish & Low Maintenance

  • The surface is smooth and does not expose any threads. This reduces the risk of scratches and impacts, making it suitable for the exteriors of household appliances, electronic enclosures, and visible components of the passenger cabin.
  • The surface treatment and color can be selected (aluminum rivets, coloring caps, closed type, etc.), with high consistency.
  • No torque re-inspection is required, and the maintenance frequency is low; it is suitable for products with low accessibility after batch delivery.

Real-World Fits

Typical Applications for Blind Rivets in Solar Mount Systems

HVAC/Air Duct System: One-sided operation + Fast pace + Low noise, friendly for construction and maintenance.
Automobile Body and Thermal End Components: Resistance to vibration and weight reduction, suitable for thin plates and multi-layer laminates.
Aviation/Railway Interior Decoration and Cabin Components: Lightweighting and Appearance Consistency.
Electronic and household appliance shells: Thin plates, plastic-gold composite materials, with high requirements for the visible surfaces.
Building Metal Curtain Wall / Profiles: Closed profiles, inaccessible areas on the backside.

Data Snapshot

Assembly cycle: Blind riveting 2 – 4 seconds per point vs Screw fastening 8 – 20 seconds per point.
Weight: Typical reduction of 70 – 90% (aluminum blind rivets vs carbon steel bolt system).
Manual: 6 – 16 seconds per point Savings, $4 – $11 per piece (100 points) Direct labor is visible.
Quality inspection and maintenance: For blind riveting, there is no need for torque recheck. For bolts, force and angle control as well as regular inspections are required.

Limitations of Blind Rivets

Although blind rivets have significant advantages in terms of single-sided installation, assembly efficiency, weight reduction, and vibration resistance, they are not a universal solution in all applications. Understanding their limitations can help make more reasonable decisions during the design and selection stages.

a. Permanent connection, difficult to disassemble

After blind rivets are installed, they achieve a permanent locking effect. If removal is required, usually the surrounding material needs to be drilled out or damaged. This implies that they are not suitable for scenarios where frequent disassembly, regular maintenance, or replacement of components are necessary. In contrast, bolt connections offer greater maintainability.

Are there galvanic corrosion problems

b. Limited load capacity

Blind rivets are more suitable for thin sheet metals and medium-strength connections. In extremely heavy and high-stress conditions, such as bridge connections, mining machinery, and main load-bearing parts of wind power, bolts or welding are more reliable. Although there are already high-strength structural blind rivets, in general, bolts still have an advantage in static loads and high shear loads scenarios.

c. Materials and Corrosion Risk

Common materials for blind rivets include aluminum, stainless steel, carbon steel, and coated steel. If the material selection is incorrect, electrochemical corrosion (such as aluminum rivets with carbon steel) may occur. The solution is to choose a material with an electrochemical potential close to that of the base material, or to use coated, anti-corrosion coatings and sealed blind rivets. In marine, chemical, or outdoor environments where exposure is long-term, designers must pay special attention to this issue.

Comparison Table of Blind Rivets and Bolts

During the design phase, engineers usually need to make trade-offs among assembly efficiency, maintenance requirements, load-bearing capacity and cost. The following table visually presents the key differences between blind rivets and bolts:

FeatureBlind RivetsThreaded Bolts
InstallationSingle-sided (front access only)Double-sided (bolt + nut)
Installation SpeedFast (2–4s per point)Slower (8–20s per point)
RemovabilityNo (permanent joint)Yes (reusable)
Vibration ResistanceHigh (permanent lock)Lower, may loosen
WeightLight (up to 70–90% reduction)Heavier
Cost EfficiencyLower (fewer parts, faster assembly, simpler inventory)Higher (more parts, torque control, frequent checks)
Typical ApplicationsAerospace, automotive, HVAC, electronics, constructionHeavy machinery, bridges, large assemblies, serviceable structures

  • Blind rivets are more suitable for industries involving mass production, lightweight structures, and limited installation space.
  • Screws, on the other hand, are indispensable in scenarios with extremely high load-bearing capacity, the need for repeated disassembly, and long-term maintenance.

Blind rivets represent an efficient and lightweight solution, while bolts represent a solution with high strength and maintainability.

Rivmate Expertise & Solutions

As a professional fastener supplier, Rivmate offers a full range of blind rivet solutions to meet the assembly requirements of various industries. Its products not only cover multiple materials, but also demonstrate a deep understanding of industry scenarios in terms of design and application.

Multiple material options available

The Rivmate blind rivets cover materials such as aluminium, stainless steel, Monel alloy, and copper.

Custom Raw Material
  • Aluminum: Lightweight, suitable for automotive and electronic enclosures.
  • Stainless Steel: Corrosion-resistant, suitable for construction and outdoor applications.
  • Monel Alloy: Resistant to salt fog and chemical media, commonly used in marine and chemical environments.
  • Copper: Conductive, suitable for electronics and electrical industries.

Widely varying grip range

Rivmate’s product design covers a wide range of grip range from thin plates to thick plates. This enables customers to reduce the variety of parts during the design stage and decrease the number of inventory SKUs.

For OEM manufacturers and distributors, it helps to reduce inventory holding costs and enhance supply chain efficiency.

Industry Optimization Series

The Rivmate blind rivets have been developed into customized series for the automotive, construction and electronics industries.

  • Automobile: Body panels, exhaust system, lightweight components.
  • Construction: Curtain walls, steel structure joints, HVAC system.
  • Electronic industry: Connection of metal and plastic shells to ensure both aesthetics and durability.

Technical Support and Value-added Services

Rivmate not only offers products, but also provides full-process technical support:

  • Model Selection Support: Assist customers in choosing the optimal model based on materials, loads, and environments.
  • Strength Verification: Through data testing and experiments, ensure the reliability of the connection.
  • Inventory Optimization: Help customers reduce the number of SKUs and achieve lower inventory and higher turnover.

FAQ

Q1: Can blind rivets replace all bolts?

No. Blind rivets are suitable for scenarios of single-sided installation, lightweight and batch production. However, in super heavy-duty structures, high-load areas or situations requiring frequent disassembly, bolts still cannot be replaced. Engineers should make reasonable selections based on load, material thickness, and maintenance requirements.

Q2: Can the blind rivets be removed after installation?

Blind rivets are of permanent connection. If disassembly is required, usually drilling or cutting is needed, which may damage the base material. Therefore, it is not recommended to use blind rivets in areas where repeated assembly or maintenance is necessary. In such scenarios, bolts or screws are more suitable.

Q3: How should one choose blind rivets in high-intensity or high-temperature environments?

It is advisable to choose structural blind rivets or high-performance materials (such as stainless steel, Monel alloy).

  • High-strength Requirements: It is recommended to use structural blind rivets, as their clamping force and shear resistance are superior to those of conventional products.
  • High Temperature Environment: Avoid using aluminum materials and instead choose stainless steel or nickel-based alloy blind rivets.

At the same time, reference should be made to international standards such as ISO 15977 to ensure that the selection meets the load and safety requirements.

Q4: Can Rivmate offer alternative solutions to reduce the assembly costs?

Sure. Rivmate not only offers blind rivet products, but also provides services such as specification optimization, strength verification and inventory management.

  • By reducing the number of SKUs, the inventory holding cost can be lowered.
  • By implementing rapid installation, the labor cost can be reduced.
  • By matching the appropriate materials, the rework and maintenance costs can be decreased.

Choose Smarter Fastening, Choose Rivmate

Rivmate Rivet Factory in Jiangsu, China

Blind rivets have significant advantages over bolts in most medium and light applications. They perform better in terms of installation efficiency, structural weight reduction, cost-effectiveness, and vibration resistance. Particularly in industries such as automobiles, aviation, electronic enclosures, and construction, blind rivets can help manufacturers achieve faster production line cycle times, lower total costs, and higher reliability.

If you are currently struggling with the selection of bolts and blind rivets, or if you wish to further reduce the assembly cost, please feel free to contact Rivmate.

  • Obtain the professional “Blind Rivet vs. Bolt Selection Guide”;
  • Consult our engineering team to obtain the “optimal solution tailored to your product and process”.

📞 Act Immediately: Partner with Rivmate and enhance your competitiveness with a more professional fastening solution.

Reference

Blind Rivets Offer a Number of Advantages over Threaded Bolts

When Would You Use a Rivet Instead of a Bolt?

Types of Rivets

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What is the Grip Length of a Rivet?

Table of Contents

One of the common problems when choosing or installing rivets is “what is the grip length of a rivet”. The grip length refers to the total thickness of the material that the rivet can firmly grip when fixed. It directly determines whether the rivet can be formed correctly and whether the connection point has sufficient strength. If the grip length is too short, the rivet cannot fully expand, which may lead to loosening; if it is too long, the rivet may deform unevenly, reducing the structural reliability. Therefore, correctly understanding the grip length is a crucial step in ensuring the quality of riveting.

However, many users often confuse grip length with the total length of the rivets, resulting in incorrect selection or installation. This is a parameter that is frequently misunderstood but is of crucial importance. This article will deeply analyze the concept of grip length, explain its relationship with the material thickness and the diameter of the rivets, and provide practical selection methods.

Definition of Grip Length

In the application of rivets, Grip Length (the thickness range of the material that the rivet can secure) refers to the range of material stacking that the rivet can firmly hold. In other words, it represents the total thickness of the material that the rivet can effectively grip and keep firmly in place after installation. For example, if the combined thickness of two plates is 5mm, then the selected rivet’s grip length must cover this thickness in order to form a qualified rivet connection.

It is particularly important to note that Grip Length ≠ Rivet Length (total length of the rivet).

  • Rivet Length refers to the complete length of the rivet from its head to its tail.
  • Grip Length is only related to the thickness of the material that can be clamped and does not include the deformed part at the tail after expansion.

Many beginners often mistakenly take the total length of the rivet as the clamping thickness, which leads to incorrect selection and affects the connection strength. The correct approach is: First calculate the thickness of the material stack, then select the type based on the grip length, and finally confirm whether the total length of the rivet matches the installation requirements.

👉 The figure below illustrates the position of Grip Length (a cross-sectional view of the head, shaft, and expansion zone):

Grip Length vs Rivet Length
  • Head of the rivet: Exposed, serving a fixing function.
  • Grip Length: The thickness range of the material stack.
  • Bulging area at the tail: Deforms during installation and is used for locking the material.

Why Grip Length Matters

In the application of rivets, the Grip Length directly determines the strength and reliability of the connection. If the grip length is too short, the rivet cannot fully grip the material, and the connection point is prone to loosening or even detachment. On the contrary, if the grip length is too long, the tail end may not expand adequately, and there may be situations such as rotation, slippage, or uneven deformation.

Installation stability also depends on the correct grip length. Only when the clamping length matches the thickness of the material can the rivet form uniform and stable deformation during installation. Either too short or too long will increase the difficulty of installation and even result in the failure of the rivet.

Types of Multi Grip Blind Rivets

From the perspective of cost efficiency, choosing the wrong grip length can lead to rework, material waste, and potential failure costs. In large-scale production or engineering projects, such losses can escalate into significant economic burdens. According to industry data, improper selection of fasteners can increase the rework rate by 10% – 15%, directly increasing manufacturing and maintenance costs.

More importantly, in industries with high reliability such as construction, transportation, and aviation, the standards are extremely strict. For instance, the US aviation standard NAS, the US industrial fastener standard IFI, and the international standard ISO all clearly stipulate that the rivets must be correctly selected based on the grip length. These standards not only ensure the connection strength but also guarantee safety and long-term durability.

How to Measure and Choose the Correct Grip Length

Choosing the correct grip length is the first step in ensuring the quality of rivet connections. Here are the recommended steps:

Step 1: Measure the total thickness of the material

Use a caliper or grip gauge to measure the thickness of all the materials that need to be tightened. This should include the gap, tolerance, surface coating, and thickness of the gasket. Ignoring these details will result in a shorter grip length, thereby causing installation problems.

Step 2: Refer to the manufacturer's Grip Range chart

Most rivet manufacturers (such as Rivmate) will provide a Grip Range chart. Just compare the total thickness of the material with the chart to find the appropriate grip length range. Rivmate also offers its own Grip Chart, which can be used as a reference tool to quickly confirm the matching model.

the grip range of blind rivet

Step 3: Recommended Nail Length

Once the grip length is determined, the corresponding total length of the rivet (rivet length) can be recommended by the chart or the selection software. Usually, the total length of the rivet = grip length + an appropriate allowance, which is used for the tail to be expanded and shaped.

Common Errors to Avoid:

  • Only the thickness of the bare material was measured, without including the paint, anodized layer or adhesive.
  • The additional layers such as gaskets and seals were ignored.
  • The selection was made solely based on experience, without referring to the grip chart or industry standards.

Recommended Tools:

  • Grip Gauge (Clamping Length Measuring Tool): The most commonly used specialized tool, which can directly display the grip length.
  • Digital Caliper: Suitable for quickly measuring the thickness of material stacks.
  • Selection Software or Mobile Application: Some manufacturers provide digital tools that can automatically recommend the appropriate nail type based on the input thickness.

By following the above methods, users can not only avoid selection errors but also improve installation efficiency and ensure long-term stability and reliability of the connection.

Grip Length vs. Grip Range

What Are Black Anodized Pop Rivets and Their Uses

In the selection of rivets, Grip Length and Grip Range are often confused with each other, but they have different meanings.

  • Grip Length: This refers to the specific material thickness that the rivet can grip. It is a fixed point value used to determine whether the rivet can match a particular thickness.
  • Grip Range: This indicates the thickness range covered by a certain type of rivet. Rivets of the same model can be applicable to various material thicknesses, as long as they fall within this range, installation can ensure reliability.

For example: The Grip Range of a certain type of rivet is marked as 0.062″—0.125″(1.6—3.2mm). This means that this rivet can be used for material combinations with a total thickness ranging from 1.6mm to 3.2mm. Users only need to confirm that the measured total thickness falls within this range, and then they can be assured to use it.

Correct understanding of these two terms can prevent errors in procurement caused by confusion. For instance, if one only focuses on the point value of grip length but ignores the grip range, one might select a model that lacks adaptability and tolerance margin, thereby increasing the risk of assembly.

Remember: Grip Length is a single point, while Grip Range is an interval. In practical applications, Grip Range is more commonly found in selection tables and product catalogs, facilitating users to quickly match the material thickness.

Case Studies

Case 1: Incorrect Choice of Grip Resulted in Re-work

A certain transportation equipment manufacturer selected the components based solely on the total length of the rivets, without taking into account the actual grip length. As a result, some rivets failed to fully expand, causing loosening and rotation problems. Eventually, over 30% of the rivets required rework, directly resulting in delays in work time and material waste. This case clearly demonstrates that ignoring grip length can seriously affect assembly quality and production efficiency.

Case 2: Selecting the Right Model Enhances Efficiency

Another customer used the “Grip Range” chart provided by Rivmate for component assembly in aviation. By accurately measuring the material thickness and selecting the appropriate grip length, the success rate of assembly was increased to 98%. The rework rate significantly decreased, and the overall assembly efficiency improved by approximately 15%. Not only did this save labor costs, but it also reduced inventory pressure.

Case 3: Industry Application Feedback

  • Aerospace sector: Customer feedback indicates that the correct selection of grip length can effectively meet the NAS and ISO standards, avoiding potential safety hazards caused by the failure of fasteners.
  • Transportation industry: In the manufacturing of railway carriages, Rivmate rivets, due to their high grip length matching degree, have increased assembly efficiency by 12% and significantly reduced maintenance frequency.
  • Furniture manufacturing: Customer reports show that after adopting the recommended grip length, the connection between wood and metal parts becomes more stable, reducing the rate of after-sales maintenance.

These cases demonstrate that: The correct selection of Grip Length is not only a technical issue, but also a key aspect of quality and cost management. Through scientific measurement and reasonable selection, enterprises can achieve the best balance among safety, efficiency and economic benefits.

FAQs

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Q1: What if the material thickness falls between the two Grip Lengths?

A: Always choose the rivet model whose material thickness falls within the Grip Range. If the thickness is exactly at the critical value, it is preferable to select the one with a grip range that is closer to the actual value rather than relying on a single grip length point value. This ensures that the tail expansion is sufficient and the connection is stable.

Q2: Can we use rivets with a longer Grip Length?

A: It is not recommended. When the Grip Length is too long, the tail end of the rivet cannot fully extend, which may result in rotation, loosening or insufficient connection strength. Industry standards (such as NAS, IFI) clearly stipulate that the rivet must match the material thickness to ensure installation quality.

Q3: Does Grip Length Affect Shear/Compression Strength?

A: Yes. Incorrect grip length will prevent the rivet from achieving the ideal expansion form, thereby reducing the shear strength and tensile strength. For instance, when the grip length is too short, the bearing capacity of the connection point is insufficient; when it is too long, the expansion is incomplete and the strength also decreases. A correct grip length can ensure that the strength is close to the design value of the rivet.

Q4: Does the thickness of the coating need to be calculated separately?

A: Required. Any additional thickness – including coatings, anodizing, sealants or gaskets – should be included in the total material thickness. If this part is ignored, the actual grip length will be shorter, causing the rivets to fail to form correctly. Especially in the aviation and transportation industries, the standard requires that the coating thickness must be precisely considered to ensure long-term reliability.

Rivmate Expert Recommendations

Before the formal riveting process, Rivmate advises users to ensure the following three key parameters:

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  1. Material Thickness: Accurately measure the total thickness, including the coating, gap, and washer.
  2. Material Type: Different materials (aluminum, steel, stainless steel) have different requirements for the expansion form and strength of the rivets.
  3. Structural Strength Requirements: Select the appropriate shear and tensile strength based on the application scenario to ensure compliance with industry standards.

Rivmate not only offers products, but also provides technical support and selection assistance to customers. Through the Grip Range chart, selection software and consultation with engineers, customers can quickly find the optimal rivet solution, avoiding rework and cost waste caused by incorrect selection.

Meanwhile, Rivmate has developed bolting solutions for multiple industries, including aviation, transportation, furniture, and construction. We can offer:

  • Online Selection Tool: Just input the material thickness and type, and it will automatically recommend the appropriate model.
  • One-on-One Technical Support: A team of professional engineers will assist you in resolving installation issues.
  • Customer Exclusive Channel: Quick connection for sample application and large-scale procurement demands.

Through scientific measurement and professional support, Rivmate helps customers achieve the optimal balance between safety, efficiency and cost control.

Get the Right Grip, Every Time – Start with Rivmate

Rivmate Rivet Factory in Jiangsu, China

In the application of rivets, Grip Length is a key parameter that ensures the strength and reliability of the connection. Incorrect selection can lead to assembly failures, rework, and additional costs, while correct selection can significantly improve installation efficiency and structural durability. Whether in aviation, transportation, furniture, or construction industries, having a correct understanding and application of grip length is a prerequisite for achieving high-quality assembly.

Rivmate invites you to learn more:

Take immediate action to ensure that every riveting operation is precise, reliable and efficient.

Reference

Understanding Blind Rivet Designs and Sizes

Multi-Grip Rivets vs Standard Grip Rivets: Pros and Cons

Types of Rivets

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