Closed End Rivets for Aluminum Boat: The Complete Guide

2024-01-09
Author: Rivmate Rivet

In the manufacturing and maintenance of aluminum vessels, the selection of fasteners directly determines the sealing performance and lifespan of the hull. Ordinary open rivets will corrode, loosen, and even leak water due to prolonged exposure to seawater and salt fog, ultimately affecting the structural safety of the vessel. Closed End Rivets for Aluminum Boat can provide strong mechanical locking. At the same time, it prevents water and air from penetrating, offering long-term anti-corrosion protection for aluminum vessels.

What Are Closed End Rivets and Why They Matter for Aluminum Boats

Closed End Rivets is a design of blind rivets with a completely sealed tail end. After installation, it can effectively prevent water, oil or gas from seeping into the tail end, thus achieving a 100% sealed connection.

a. Structure and Principles

The closed-type rivet is composed of a rivet body and a mandrel. During installation, the mandrel is pulled, causing the tail of the rivet body to undergo plastic deformation and forming a tightly sealed cavity.

When the core shaft is broken, the closed end seals the tail hole, thereby preventing any liquid or gas from passing through. This structure ensures the air tightness and water resistance of the joint, and suitable for applications in areas that are constantly submerged in water or have high humidity.

When the core shaft is broken, the closed end seals the tail hole, thereby preventing any liquid or gas from passing through. This structure ensures the air tightness and water resistance of the joint, and is particularly suitable for applications in areas that are constantly submerged in water or have high humidity, such as the bottom of ships, cabin joints, and aluminum plate connections.

b. Performance Comparison and Advantages

Compared with traditional open-ended blind rivets, the closed-type rivets have the following significant advantages:

Waterproof, oilproof, and gasproof —— Ensures that the aluminum hull seams will not leak over a long period of time.
Strong corrosion resistance —— Suitable for marine and high-salt environment.
Prevents core shaft from falling off —— The core shaft is fully locked in the rivet, preventing internal rust or loosening.
Higher structural integrity —— Suitable for long-term fixation in high-vibration and high-humidity environments.

c. Relevant Standards and Industry Certifications

The performance of closed-type rivets generally complies with the following international standards:

ISO 15983 – Standard for blind rivet structure and mechanical properties.
ASTM F1470 – Specification for blind rivets and corrosion resistance tests.

In the manufacturing of marine equipment and aluminum hulls, the selection of closed-type rivets that meet these standards can significantly enhance the water resistance and long-term durability of the hull.

Why Use Closed End Rivets for Aluminum Boats?

1. Watertight Sealing

The tail end of the closed-type rivets will form a completely sealed cavity during installation, effectively preventing water, oil or gas from seeping in from the back. This characteristic is particularly important in the hull bottom, aluminum plate joints and cabin seam areas, ensuring that the ship remains dry and sealed even when submerged for a long time. Moreover, the sealing structure can also prevent electrochemical reactions and avoid aluminum oxidation caused by water retention.

2. Corrosion Resistance

The marine environment has high salinity and high humidity, which accelerates metal corrosion. Closed-type rivets are usually made of aluminum alloy, stainless steel or Monel. These materials have excellent corrosion resistance in salt spray environments. In particular, 316 stainless steel closed-type rivets can maintain no-corrosion performance for over 1000 hours in the ASTM B117 salt spray test, making them ideal for use in marine and freshwater vessels. This durability ensures that the hull remains stable and reliable during long voyages and berthing.

3. Vibration & Shear Resistance

During the ship’s movement, it will experience continuous vibration and periodic impacts. If the connecting parts become loose, it will lead to structural cracks or even leakage.

During the installation process of the closed-type rivets, the core shaft is locked inside the rivet body, forming a high-strength mechanical locking structure. This design offers excellent shear and tensile strength, effectively resisting wave impacts and engine vibrations. Compared to ordinary open rivets, its structural integrity is stronger, significantly extending the service life of the hull.

4. Lightweight Strength

The closed-type aluminum rivets are not only lightweight but also have an excellent strength-to-weight ratio. They can provide reliable fastening performance without increasing the weight of the hull. This makes them an ideal choice for aluminum hulls, hatch covers, deck assembly, and lightweight fishing boats, among other structures.

Best Materials for Closed End Rivets in Marine Applications

In the assembly and maintenance of aluminum hulls, the choice of rivet material determines the anti-corrosion lifespan and structural stability of the vessel. Selecting the appropriate closed-end rivets for aluminum boat can enhance the waterproof performance and prevent electrochemical corrosion and structural fatigue.

a. Aluminum Rivets

Aluminum rivets are one of the most commonly used fasteners on aluminum ships. They are lightweight and do not have an electrochemical reaction with the aluminum hull, thus avoiding corrosion issues. The closed-type aluminum rivets also maintain excellent waterproof sealing properties, making them particularly suitable for freshwater environments or small vessels.

In addition, aluminum has a high strength-to-weight ratio, which enables it to reduce the overall weight while ensuring structural safety. It is an ideal choice for lightweight vessels, fishing boats, etc. However, in a long-term saltwater environment, the anti-corrosion layer should be inspected regularly to prevent surface oxidation.

b. Stainless Steel Rivets

Stainless steel rivets are renowned for their high strength and excellent anti-corrosion properties. 304 stainless steel is suitable for general freshwater use, while 316 stainless steel, due to its molybdenum content, has a stronger resistance to chloride ion corrosion and is therefore highly suitable for marine environments.

However, during installation, special attention must be paid to the metal compatibility issue: Stainless steel should not come into direct contact with aluminum plates; otherwise, electrochemical corrosion may occur due to potential differences. In practical operations, EPDM / nylon gaskets can be added to the contact surfaces to block the electrical path.

c. Monel Rivets

Monel is a high-end marine alloy composed mainly of nickel and copper. It possesses extremely strong resistance to salt fog and acid-base corrosion, and is hardly corroded even in marine or port environments. Monel rivets are typically used in high-end yachts, military speedboats, and ships engaged in long-term maritime operations. They are costly, but have a lifespan of over 30 years, making them the preferred choice for applications requiring extremely high reliability. According to the ASTM B117 salt fog testing standard, Monel materials can remain free from significant corrosion for over 2000 hours.

How to Choose the Right Closed End Rivets for Aluminum Boats？

① Diameter vs Hole Size

The accuracy of the aperture directly affects the riveting strength and sealing effect. Generally, it is recommended that the hole size be 0.1–0.2 mm larger than the diameter of the rivet. If it is too small, it will cause installation difficulties or deformation; if it is too large, it will result in loosening and water leakage.

For example: When using 4.8 mm rivets, the ideal hole diameter should be 4.9 – 5.0 mm. For closed-type rivets, it is also necessary to ensure that the hole wall is smooth and free of burrs to prevent damage to the waterproof layer.

② Grip Range

Grip Range refers to the total thickness of the material that the rivet can firmly connect. When choosing, it is necessary to ensure that the Grip Range of the rivet covers the total thickness of two (or more) layers of material; otherwise, the rivet body will not expand sufficiently and the sealing performance will be affected.

Rivmate suggests:

If the total thickness of the material is 3.5 mm, the model with a Grip Range between 3 and 5 mm should be selected;
If the thickness varies significantly, the Multi-Grip Structural Rivets (Multi-Clamping Range Structural Rivets) can be used.

③ Head Type Selection

Dome Head

The surface is smooth and the installation is convenient;
It is suitable for the outer plates, decks, supports and other parts of the hull;
The round head can better distribute the stress and prevent local depression.

Countersunk Head

The head is level with the surface, suitable for smooth surfaces or areas with high decoration requirements;
It is commonly used for ship hull exteriors, cabin door edges, and interior decorative panels;
Before installation, it is necessary to chamfer the corners in advance to ensure that the rivet head fits perfectly.

④ Material Compatibility

In metal fastening, electrochemical corrosion (Galvanic Corrosion) is a common hazard. When two metals with different potentials come into contact and are exposed to an electrolyte (such as salt water), a small current is generated, causing corrosion. Therefore, the following principles should be followed:

Aluminum vs. Aluminum: Suitable for freshwater vessels, preventing electrochemical reactions.
Stainless Steel vs. Stainless Steel: Suitable for high salt spray or marine hulls.
If it is necessary to use them together, an anti-corrosion gasket (EPDM / nylon) should be added to isolate metal contact.

⑤ Recommended Models by Rivmate

Rivmate offers high-performance rivet solutions specifically designed for marine applications:

Rivmate Marine Closed-End Series – Specifically designed for marine vessel body sealing assembly, featuring 100% waterproof structure;
Rivmate Hybrid Rivets – Combination of aluminum and stainless steel core shaft, achieving both lightweight and high strength;
Rivmate 316 Stainless Rivets – Suitable for high-salt spray and marine environments, with a lifespan of over 25 years.

These products have all passed the ASTM B117 salt spray test and the ABYC H-1 ship structural fastening standard, demonstrating extremely high reliability in actual marine environments.

Maintain Aluminum Boats with Closed End Rivets

The correct maintenance method not only extends the lifespan of the hull, but also enables the closed end rivets to achieve the best waterproof and corrosion-resistant performance.

Conduct a routine inspection of key connection points every six months

The riveted connection points are the core areas where the hull is subjected to force and where sealing occurs. It is recommended to conduct a routine inspection every six months, with a particular focus on the following areas:

The junction between the bottom of the ship and the cabin;
The connection points where the supports, decks and outer plates meet;
The protective cover for the propeller and the area where the fuel tank is fixed.

During the inspection, it is necessary to confirm whether the head of the rivet is flat, and whether there are any signs of loosening, cracks or oxidation. If any minor movement is detected, a Rivmate closed-type rivet of the same specification can be used for re-fastening.

Regularly clean the hull to prevent the accumulation of salt

Salinity is the main factor causing metal corrosion. After each voyage, it is recommended to use high-pressure freshwater rinsing to clean the surface and riveted areas of the vessel, and use a neutral cleaner to remove oil stains. Key cleaning areas include: the bottom of the vessel, the edges of hatches, drainage holes, and rivet joints.

Maintaining dryness can significantly delay the electrochemical corrosion process. For ships that are frequently used at sea, a thorough cleaning and maintenance can be carried out once a month.

If find that the rivets are loose or have rust spots, replace them immediately

Once any looseness, detachment of the cap, or rust spots are observed on the rivets, they must be replaced immediately. Especially for the open-type rivets, the internal cavity is prone to accumulate salt, accelerating corrosion. When replacing, it is recommended to use Closed End Rivets first to ensure that the new joint has complete sealing performance.

Rivmate suggests using rivets of the same material or of a higher grade (such as 316 stainless steel or Monel) to prevent electrochemical reactions caused by metal mismatch.

Use Rivmate 316 stainless steel closed-type rivets for reinforcement and maintenance

After long-term use, even if there are no obvious structural issues, regular protective reinforcement can be carried out. The 316 stainless steel closed-type rivets series of Rivmate is specifically designed for marine environments. It has passed the ASTM B117 salt spray test for 1000 hours and demonstrates outstanding corrosion resistance.

Reinforcement and maintenance can be carried out under the following circumstances:

There are minor water seepage issues in the weld areas of the hull;
There is slight deformation at the aluminum plate joints;
The bottom of the ship or the compartments need to have enhanced anti-vibration connections.

This type of preventive maintenance can extend the lifespan of the aluminum ship structure by 3 to 5 years and reduce the risk of major repairs in the future.

FAQ

Q1: What size closed end rivets should I use for aluminum boats?

The size of the rivets should be determined based on the total thickness of the ship’s hull plates (Grip Range). Generally speaking, the diameter of the hole should be 0.1–0.2 mm larger than the diameter of the rivet to ensure that the rivet can be formed smoothly without loosening. For example:

For the connection of aluminum plates with a thickness of 3–4 mm, the 4.8 mm (3/16″) closed-type rivets can be selected;
For thicker structural plates (such as the bottom of a ship or a support), it is recommended to use 6.4 mm (1/4″) structural closed rivets to achieve higher shear strength.

Rivmate recommends using the models with Multi-Grip to reduce inventory and installation errors.

Q2: Are stainless steel rivets safe for aluminum hulls?

Not completely safe. Although stainless steel closed-type rivets (such as type 316) have excellent anti-corrosion properties, Galvanic Corrosion may occur when in contact with aluminum. If stainless steel rivets must be used on an aluminum vessel, insulating gaskets (EPDM, nylon, or anti-corrosion coatings) should be installed between the contact surfaces.

Q3: How do I waterproof rivets on my aluminum boat?

The key to achieving waterproofing is to use Closed End Rivets and follow the correct installation procedures. Before installation, it is necessary to apply waterproof sealant (Marine Sealant) or corrosion inhibitor at the hole opening; after the rivets are installed, the closed cavity at the tail end will completely prevent water from penetrating, thus forming a permanent seal. Compared to ordinary open rivets, the closed design significantly improves waterproof performance and reduces the need for long-term maintenance.

Q4: Can closed end rivets replace welding on small boats?

In certain structures, closed-type rivets can indeed replace welding. For small aluminum boats (Jon Boats, fishing boats, lightweight hulls), the use of closed-type structural rivets can achieve a fastening effect with strength comparable to that of welding. The advantages include:

One-sided installation makes construction easier;
No need for high-temperature operation, which will not damage the aluminum structure;
Waterproof, shockproof and maintenance-free.

However, for the main structural parts that are subjected to high impact or stretching loads, it is still recommended to use them in conjunction with welding or reinforcement components.

Ensure Lasting Strength and Sealing with Rivmate Closed End Rivets

Closed End Rivets for Aluminum Boat has been proven to be the most reliable and cost-effective waterproof fastening solution. It not only achieves a complete seal to prevent water and salt spray from entering, but also maintains excellent shear and tensile strength in high-vibration and high-humidity marine environments. Compared to welding and bolt connections, the closed-end rivet structure is lightweight, easy to install, requires no maintenance, and is particularly suitable for the structural assembly and long-term use of small and medium-sized vessels.

Rivmate has over ten years of experience in marine fastening technology, specializing in providing high-strength, corrosion-resistant marine riveting solutions for shipyards, maintenance technicians, and individual boat owners. Our products comply with the ASTM B117 salt spray test standard and the ABYC H-1 hull fastening specification, ensuring that each rivet can maintain stable performance in the most demanding marine environments.

👉 Click here to visit [Rivmate Marine Fastening Center]

Explore the complete Closed End Rivets for Aluminum Boats, installation tools and anti-corrosion solutions. Keep your aluminum boat waterproof, safe and reliable for every voyage in the future.

Reference

The Ultimate Guide to Aluminum Boat Rivets

Aluminium Rivets for Boats: Your Ultimate Guide

How to Rivet Metal to Wood？

How to Rivet Metal to Woo

Purchasing cost of zinc plated blind rivets

What Is Riveting in Metal Work？

What Is Riveting in Metal

Custom Rivet Manufacturer in China - Custom Pop Rivets for your Project

What Metal Are Rivets Made Of

What Metal Are Rivets Mad

How to Install Pop Rivets? - Pull the Mandrel Until it Breaks

How to Rivet Metal to Metal

How to Rivet Metal to Met

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Wholesale Blind Rivets from Rivet Manufacturer

How to Choose Blind Rivets for Solar Industry

In the solar photovoltaic industry, blind rivets for solar industry have become key fasteners for connecting metal frames, borders, and installation components. Unlike general industrial environments, photovoltaic systems are exposed outdoors for long periods, facing multiple challenges such as high temperatures, humidity, wind loads, and long-term vibrations. The requirements for fasteners in the solar industry are far higher than those in general mechanical assemblies. This article will conduct an in-depth analysis from five dimensions: material selection, structural type, corrosion resistance, mechanical strength, and installation efficiency. It aims to help you understand how to choose the appropriate blind rivets for solar industry for different photovoltaic scenarios and provide professional suggestions and application solutions from Rivmate.

Understanding Blind Rivets in Solar Applications

In solar photovoltaic systems, blind rivets for the solar industry play an extremely crucial role in connection. Blind rivets are mechanical fasteners that can be installed from a single side. Their core structure consists of a rivet body and a mandrel. During installation, the mandrel is pulled, causing the tail of the rivet body to undergo plastic deformation, thereby forming a reliable mechanical lock between the workpieces. After the mandrel breaks, it remains inside the rivet body, further enhancing the connection strength and anti-vibration performance.

Blind rivets are widely used in various structural connection scenarios in photovoltaic systems.

Rapid assembly of support structures: Quick fixation between aluminum alloy profiles to ensure the overall stability of the structure.
Fixation of component frames: Used for the combination of aluminum frames and connecting parts to ensure that photovoltaic panels do not shift under long-term wind loads.
Installation of cable trays and windproof clamps: In photovoltaic power stations, blind rivets can achieve lightweight and maintenance-free fastening effects.

Compared with welding and bolted connections, blind rivets have significant advantages:

Single-sided installation: Particularly convenient in narrow or inaccessible structures.
Strong vibration resistance: The mechanical locking after riveting effectively resists stress changes caused by wind loads and thermal expansion and contraction.
Maintenance-free: No need for regular tightening or coating maintenance, suitable for photovoltaic systems with a lifespan of over 25 years.

In addition, blind rivets are not restricted by material types and can be used for connections between various metals such as aluminum, steel, and stainless steel, making them a standardized fastening solution in the manufacturing of photovoltaic racks and modules.

Key Requirements for Choosing Blind Rivets in the Solar Industry

In solar photovoltaic systems, blind rivets are not only fasteners but also an important guarantee for structural reliability. The selection of rivets must simultaneously meet multiple requirements such as durability, strength, weather resistance and installation efficiency. The following are the four key standards for rivets in the photovoltaic industry:

① Superior Corrosion Resistance

The design lifespan of photovoltaic systems is typically over 25 years, and they are exposed to complex environments such as high humidity, acid rain, and salt fog for an extended period. Ordinary aluminum rivets are prone to corrosion under these conditions, leading to loose connections or even failure.

Therefore, it is recommended to use stainless steel rivets (A2/A4 grades) or anodized aluminum rivets, as they can maintain a corrosion-resistant stability of over 1000 hours in the ASTM G85 and ISO 9227 salt spray tests.

This protective performance is particularly crucial for photovoltaic power stations located in coastal areas, deserts or high-salt environments.

② Thermal and UV Resistance

The photovoltaic power station usually operates in a working environment ranging from 70°C to 90°C during summer, and the surface of the components is exposed to intense ultraviolet radiation.

The rivets must have excellent thermal stability and must not loosen due to thermal expansion and contraction. Aluminum alloy and stainless steel rivets perform exceptionally well under thermal cycling conditions, maintaining stable clamping force. At the same time, surface treatment (such as anodization) can prevent ultraviolet aging and extend the service life.

③ Mechanical Strength and Grip Range

The photovoltaic support needs to withstand strong winds, snow loads and long-term vibrations, and has extremely high requirements for the mechanical properties of the fasteners. The rivets should have high shear strength and tensile strength to ensure the stability of the connection point over a long period. It is recommended to use Structural Blind Rivets, whose core shaft locking structure can significantly enhance the vibration resistance and prevent the photovoltaic panel from shifting or the support from losing stability due to loosening.

Furthermore, during the selection process, it is necessary to ensure that the length of the rivets matches the thickness of the material based on the Grip Range.

④ Installation Efficiency and Consistency

The construction of a photovoltaic power station usually involves tens of thousands of connection points. The efficiency of on-site construction directly affects the overall project duration and labor costs.

Using an air riveting gun or cordless electric riveting gun can significantly increase the installation speed and maintain consistent tension output. Compared with traditional manual tools, automated equipment can reduce operational errors and ensure consistent quality at each connection point, which is crucial for large-scale projects.

Best Materials for Blind Rivets in Solar Structures

In solar photovoltaic systems, the selection of the material for the rivets directly affects the lifespan and safety of the structure. As the system is exposed to high temperatures, humidity, sand and salt fog for an extended period, choosing the appropriate material is more crucial than selecting the structural form. The following is an analysis of the performance of several common rivet materials and their recommended applications.

a. Stainless Steel 304 / 316

Stainless steel is the most popular high-end rivet material in the photovoltaic support industry. Its greatest advantage lies in its excellent corrosion resistance and mechanical strength, which ensures stable connection even in environments with salt fog, acid rain and high humidity.

304 stainless steel is suitable for regular outdoor applications;
316 stainless steel contains molybdenum and can resist corrosion from chlorides, making it particularly suitable for coastal areas or photovoltaic power stations in high salt spray environments.

According to the ASTM B117 salt spray testing standard, 316 stainless steel can remain free of corrosion after 1000 hours of testing, making it the preferred choice for long-term outdoor structures.

b. Anodized Aluminum

Anodic oxidation aluminum rivets possess excellent anti-corrosion properties and lightweight advantages. They are lightweight, easy to install, and are particularly suitable for aluminum profile supports and frame components. Additionally, the anodizing process can form an oxide protective layer on the surface, enhancing resistance to ultraviolet rays and corrosion resistance.

These rivets are commonly used in photovoltaic projects that require moderate strength but are sensitive to cost, such as distributed rooftop power stations.

c. Zinc-Plated Steel

Galvanized steel rivets, due to their high strength and economic efficiency, have become a choice for certain low-cost projects. The galvanized coating can provide short-term corrosion protection, but it is prone to oxidation and peeling in high-salt spray or high-humidity environments.

This type of material is more suitable for indoor or non-coastal photovoltaic applications, and is not recommended for use in areas with high humidity, acidic conditions, or heavy dust.

d. Hybrid Rivets

The composite rivets usually adopt a combined design of aluminum rivet body + stainless steel core shaft. It combines the lightweight property of aluminum with the high strength of steel, making it a solution that balances performance and cost. This design effectively prevents the rivet body from corroding and provides sufficient shear strength, making it highly suitable for the assembly of photovoltaic rails, component fixation, and wind-resistant fixture installation.

Industry Standards Reference

To ensure the reliability and consistency of the materials, Rivmate recommends following the following international standards when making the selection:

IEC 61215 – Standard for mechanical load testing of photovoltaic modules, used to assess the impact of fasteners on the overall structure.
ASTM B117 – Standard for salt spray test, used to verify the anti-corrosion performance.

Types of Blind Rivets for Solar Applications

In the solar industry, blind rivets have a variety of applications. A solar panel cannot be stabilized without the use of blind rivets. I will list you some of the commonly used blind rivets in the solar industry.

Blind Rivets for Solar Panel

The installation of solar panels requires the selection of blind rivets of appropriate length, suitable material and weather resistance. The following types of blind rivets are often used for solar panel installation.（Lockbolt Rivet, Bulbtite Rivet, Hemlok Rivet）

Blind Rivets for Solar Tracking Bracket

It takes a lot of strength to hold a solar tracking bracket in place, and many types of blind rivets are needed as well. Commonly used blind rivets are rivet nuts, bulbtite rivets, bom rivets, lockbolt rivet, monobolt rivet, hemlok rivet.

Best Practices for Installing Blind Rivets in Solar Mounting Systems

Advantages	Reasons to Use Blind Rivets
lightweighting	Blind rivets are lighter than welded and bolted connections, contributing to the portability and installation efficiency of solar panels.
Structural Strength	Blind rivets provide reliable structural strength to securely fasten solar panels.
Preventing Material Damage	The process of installing blind rivets poses a low risk of damage to the solar panel material and does not generate high temperatures or vibrations.
Quick and Easy Installation	The installation process of blind rivets is relatively simple and fast, saving installation time and labor costs.
Reversibility and Repairability	Blind rivets provide reversible connections for easy removal and replacement of solar panel or racking components.

FAQ

Q1: What are the best blind rivets for solar panel installation?

In solar photovoltaic installations, the best choice is structural or closed-end blind rivets. These types of rivets have high shear strength and excellent waterproof sealing properties, and can withstand wind loads, vibrations, and rain erosion.

Rivmate suggests using 316 stainless steel structural blind rivets in the photovoltaic support frames and component frameworks to ensure long-term stability and corrosion resistance.

Q2: Are stainless steel rivets necessary for solar structures?

Yes, it is recommended to use stainless steel rivets, especially in outdoor environments. Photovoltaic systems are usually exposed to high temperatures, humidity and ultraviolet rays, and ordinary aluminum or galvanized rivets are prone to rust.

Type 304 stainless steel is suitable for routine projects, while Type 316 stainless steel, due to its molybdenum content, offers superior corrosion resistance in high salt spray, marine or humid hot environments.

Q3: How to prevent rivet corrosion in solar mounting systems?

To prevent the corrosion of rivets, the key lies in selecting matching materials and providing adequate surface protection. First of all, use rivets that are compatible with the connected materials to avoid electrochemical corrosion (such as the contact between aluminum and steel). Secondly, in high-humidity environments, use anodized aluminum or stainless steel rivets, and add anti-corrosion gaskets (made of EPDM or nylon material). For large-scale photovoltaic power stations, regular salt spray tests and rechecks of the anti-corrosion coating should be conducted to ensure the reliability of the fastening points over the long term.

Q4: Can blind rivets replace bolts in solar supports?

In most photovoltaic installations, blind rivets can partially replace bolt connections, especially for structures with single-sided installation or limited space. Compared to bolts, blind rivets have advantages such as fast installation, resistance to vibration, and maintenance-free. They are highly suitable for fixing photovoltaic supports and frames. However, for areas that require removable or high dynamic loads (such as main structure connections), it is still recommended to retain bolts or use a mixed fastening method.

Power Your Solar Projects with Rivmate Blind Rivets

Selecting the appropriate blind rivets is crucial for ensuring the long-term stability and high reliability of the photovoltaic structure. High-strength and corrosion-resistant rivets not only can withstand extreme climates and wind loads but also significantly reduce the maintenance costs in the later stage.

For solar systems that have been exposed to the elements for more than 25 years, a reliable fastening solution means safer power generation, less downtime for maintenance, and higher return on investment.

Rivmate boasts extensive industry experience and specializes in the design and manufacture of high-performance fasteners for photovoltaic supports, component installation, and cable management systems. Our engineering team provides professional-grade products that comply with ASTM, ISO, and IEC standards to global customers, and offers optimized solutions for different climate conditions.

Whether you are a manufacturer of photovoltaic brackets, an EPC contractor, or a maintenance engineer, Rivmate can provide you with reliable and efficient riveting solutions.

👉 Visit [Rivmate Solar Fastening Center] to learn how we use structural blind rivets and intelligent electric riveting tools to help you achieve faster installation, longer lifespan, and higher reliability in your solar energy project.

Reference

Solar Power Systems

How To Choose The Right Fastening Solution For Your Renewable Energy Project

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Are Rivets Stronger Than Bolts ? How to Choose Rivets or Bolts ?

2024-01-04
Author: Rivmate Rivet

Are rivets stronger than bolts ?Not sure how to choose the right fasteners for your project? This blog can solve your problem. I show you the benefits and applications of rivets and bolts. You can quickly solve your confusion with this article.

What is a Rivet ?

Blind rivets, also known as pop rivets, are a kind of rivets suitable for single-sided riveting. Its high reliability, connection strength, long life, easy to operate and use, can be used for aluminum alloy, structural steel and composite materials connection.

Blind Rivet consists of two parts, which are rivet body and nail core. In the production process, the rivet body is usually produced using wire cold heading, plate stamping or tube processing.

Blind rivets are suitable for use where the joint can only be riveted from one side. The rivet is placed into a pre-drilled hole and the core is pulled with a special riveting tool to deform and expand the rivet body to realize the fixing.

What is a Bolt ?

Bolt is a common fastener used to join two or more parts. It usually consists of a rod-like body with external threads, a head, and a nut.

The body of the bolt has external threads for securing the bolt to a part. The head of the bolt typically has a hexagonal shape to allow it to be turned using a wrench or wrench. A nut is a part with internal threads that is used to secure a bolt to another part by threading it to match the bolt’s external threads.

A bolt is used by threading the body of the bolt through the hole of the part to be joined, and then screwing the nut onto the body of the bolt so that the two parts are tightly joined together. By tightening the nut, the bolt creates a pre-pressure that makes the connection stronger and more stable. Bolts can also be disassembled and reused, giving them greater flexibility and convenience.

Are Rivets Stronger Than Bolts ?

	Rivets	Bolts
Threading	No threading required	Requires threading of connected parts
Strength and Stability	Provides high strength, permanent connection	Higher strength and stability
Suitable for thin plates	For thin plate connections and thin materials	Suitable for a wide range of materials
Tools	Specialized installation Tools	Brick marking can be done with a hand-held tool
Installation	Quick installation, no thread rotation required	Requires threaded swivel mounting for slower speeds
Disassembly and Reuse	Not easy to disassemble, need to cut the pins short to unattach. Cannot be reused.	Installation can be accomplished using standard tools and is reusable
Usage Scenarios	Unilateral mounting. Both sides mounted.	Installation on both sides only

Rivet vs Bolt Strength Analysis

Shear Strength:
Rivets perform exceptionally well in double-shear structures, with uniform force distribution and effective load dispersion. Particularly, structural rivets, with shear strength reaching 10–12 kN (for a diameter of 6.4mm), are often used in high-vibration areas such as bridges and vehicle frames. In contrast, bolts rely on the frictional force of the threads to transfer shear force, and their structural stability is slightly inferior.
Tensile Strength:
Bolts have a distinct advantage in tensile loads. Their axial preload effectively prevents joint opening, making them suitable for heavy-duty and disassemblable structures. Rivets, lacking the thread preload, are not suitable for high tensile force applications.
Vibration and Fatigue Resistance
Riveted connections without threaded notches have smaller stress concentrations and better fatigue resistance. In contrast, bolts tend to loosen under vibrating conditions and require additional anti-loosening measures (such as thread locking agents or spring washers).
Serviceability & Durability
Rivets are permanent connections and almost maintenance-free. Bolts, on the other hand, can be repeatedly disassembled and assembled, which is convenient for inspection and replacement, but it also means that the connection may weaken due to frequent disassembly and assembly.

Rivet vs Bolt Material Comparison

In the field of engineering fastening, the material and manufacturing process directly determine the strength, durability and applicable environment of fasteners. Rivets and bolts of the same material have significant differences in mechanical properties and corrosion resistance. Therefore, correct material selection is crucial for structural safety.

① Comparison of Material Composition

Rivets are typically made of:
- Aluminum Alloy: Lightweight and corrosion-resistant, suitable for automotive and aviation lightweight structures.
- Carbon / Alloy Steel: High strength, commonly used in bridges and mechanical equipment.
- Stainless Steel 304 / 316: Resistant to salt spray and fatigue, ideal for outdoor or high-humidity environments.
- Monel / Nickel Alloy: Extremely corrosion-resistant, used in marine and aviation structures.
Bolts are often made of:
- High-strength Alloy Steel (Grade 8.8 / 10.9 / 12.9): Possessing excellent tensile strength.
- Carbon Steel: An economical option, widely used in building and mechanical connections.
- Stainless Steel: Suitable for assemblies requiring long-term corrosion resistance.

② Differences in Processing and Connection Principles

Rivet connection achieves permanent fastening by means of “plastic deformation locking”. When cold or hot riveting, the rivet expands in the hole and fills the gap, forming a tight bond. This connection method has no stress concentration points at the threads and has excellent fatigue resistance.
Bolt connection achieves clamping through “pre-tightening force + friction”. The pre-tightening torque provides an initial pressure, but the threads can cause stress concentration and loosening risks. Therefore, in high-vibration environments, anti-loosening washers or thread locking compound are usually required.

③ Rivmate Technical Data

Rivmate test data shows:

The shear strength of the standard 6.4mm structural blind rivet can reach 12.5 kN, which is approximately 80% of the strength of an M8 high-strength bolt.
The weight of an aluminum alloy rivet is only one-third that of a steel bolt of the same size, offering a significant advantage in lightweight assembly.

Industrial Applications: Where Rivets and Bolts Excel

Rivets and bolts play different roles in various industrial fields. The choice of which fastening method to use depends on load characteristics, maintenance requirements and environmental conditions. Research by Rivmate shows that rivets excel in permanent connections and lightweight structures, while bolts have more advantages in maintainable and high-preload structures.

Aerospace

In aircraft manufacturing, rivets play an absolute leading role. The structures used in aviation are mostly made of aluminum alloys and titanium alloys. Welding may cause thermal deformation, while rivets can form high-strength connections at room temperature.

Advantages: Lightweight, high vibration resistance, and long fatigue life.
Representative Applications: Aircraft fuselage skin, wing frame, and cabin panels.

Aerospace rivets (such as those made of Monel and titanium alloys) can maintain stable structural performance throughout a service life of over 25 years.

Automotive Manufacturing

Rivets and bolts are used in parallel in the lightweighting of vehicle bodies and the assembly of electric vehicles.

Rivets Predominant: Suitable for aluminum alloy body, doors, and battery pack structures, facilitating automated installation.
Bolts Predominant: Applied to chassis, suspension, and powertrain systems, facilitating maintenance and replacement.

The Rivmate Structural Blind Rivet has a shear strength of 11kN at the vehicle body connection points and can replace spot welding structures.

Construction & Infrastructure

Large structures such as bridges and steel trusses often use high-strength bolts (Grade 10.9/12.9), which are easy to disassemble for maintenance and inspection.

Rivet Application: In the early days of steel bridges, hot riveting was commonly used. Nowadays, it is only employed in certain structural repairs or decorative connections.
Bolt Application: High pre-tension and friction-type connections ensure structural stability. If maintenance-free and better vibration resistance are pursued, Rivmate Structural Rivet can be considered as an alternative solution.

Rivet vs Bolt: Advantages and Disadvantages

In the field of structural fastening, rivets and bolts each have their own advantages. The choice of which method to use should be determined based on factors such as load type, vibration conditions, maintenance cycle, and structural accessibility. The following is a professional comparison summarized by Rivmate:

Advantages of Rivets

Excellent vibration resistance: The riveted structure forms a tight bond through plastic deformation, unlike bolts which may loosen due to vibration.
Permanent connection: Suitable for structures that cannot or do not need to be disassembled later, such as aircraft skins, bridge nodes, vehicle frames, etc.
Good fatigue resistance: The stress is evenly distributed, especially in the double shear structure, effectively reducing local stress concentration.
Lightweight advantage: The weight of aluminum alloy and stainless steel rivets is only 30%–50% of that of the same specification bolts, which is particularly important in automobiles and aviation.

Disadvantages of Rivets

It cannot be disassembled. If repair is needed, it must be drilled apart.
The installation process is complex and requires special riveting equipment and molds.
Pre-tightening force cannot be applied and it is not suitable for high-tension structures.

Advantages of Bolts

Removable and Reusable: Facilitates maintenance, replacement and regular inspection.
High Tensile Strength: The pre-tightened threads can effectively withstand axial loads, suitable for heavy-duty applications such as bridges, machinery and construction.
Easy Installation: High degree of standardization, universal specifications worldwide, facilitating replacement and on-site operations.

Disadvantages of Bolts

Prone to Loosening: Requires anti-loosening measures (such as locking washers, thread sealants) in a long-term vibrating environment.
Significant Stress Concentration: The root of the thread is a typical fatigue source point, which is prone to cause crack propagation.
Heavier Weight: The overall structure weighs approximately 20% – 30% more than the riveted solution.

Rivmate Engineering Insights: Choosing the Right Fastening System

In industrial assembly and structural design, choosing the right fastening system determines the reliability of the structure, maintenance cycle and cost control. Rivmate, as a professional fastening technology supplier, based on thousands of engineering verifications, has summarized the following suggestions:

If the structure is subjected to long-term loads and high-vibration environments

It is recommended to use the Rivmate Structural Rivet Series. These rivets feature a locking core design, enabling permanent mechanical locking even under extreme conditions.

Application Scenarios: Automotive body frames, wind turbine towers, rail vehicles, bridge joints.
Technical Characteristics: Shear strength ≥ 12kN, vibration loosening resistance performance is 30% better than high-strength bolts.

If the connection needs to be frequently disassembled and assembled or requires pre-tightening control

Choose Rivmate Bolt Fastening Solutions (bolt fastening system). Rivmate’s high-strength locking bolt system offers precise torque control and reusability, making it suitable for maintainable structures.

Application scenarios: Construction machinery, heavy-duty equipment, and building steel structures.
Technical features: Adjustable preload force, tensile strength up to 10.9/12.9 grade standards.
Additional options: Optional coating anti-corrosion treatment and torque locking technology to extend service life.

Rivmate's systematic fastening solution

Rivmate offers a full range of fasteners from aviation-grade high-strength rivets to industrial lock bolt systems, along with hydraulic, electric and automated installation tools to achieve efficient and safe assembly. Rivmate Technology Commitment: Each product is certified by ISO 9001 / IATF 16949 and verified by ASTM / ISO / DIN standard mechanical performance tests.

FAQ

Q1: Are rivets stronger than bolts in shear?

Yes, in most double-shear structures, rivets typically exhibit superior shear strength compared to bolts. This is because rivets achieve full-contact locking through plastic deformation, enabling uniform stress distribution, whereas bolts primarily rely on friction and localised clamping forces to bear loads. For instance, the Rivmate 6.4mm structural rivet achieves a shear strength of 12.5 kN, equivalent to 80% of an M8 high-strength bolt.

Q2: Can rivets replace bolts in structural applications?

In certain instances, yes. For permanent, vibration-resistant, or difficult-to-maintain structures—such as those in aviation, automotive bodies, or bridge joints—rivets are the superior choice. However, for connections requiring periodic maintenance or disassembly, bolts remain more suitable. Rivmate recommends employing rivets in static loads and high-vibration environments, while utilising bolts in maintainable structures. Combining both achieves optimal performance.

Q3: Why are airplanes riveted instead of bolted?

Aerospace structures demand lightweight construction and fatigue resistance. Rivets are lightweight, require no threaded structures, and do not induce stress concentrations or fatigue crack propagation. Furthermore, rivets form reliable connections between dissimilar materials—such as aluminium alloys and titanium alloys—without thermal influence. Consequently, over 90% of aircraft skins and frames utilise riveting techniques.

Q4: Which is better for vibration — rivet or bolt?

Rivets are demonstrably superior to bolts. Bolts may loosen or experience a reduction in preload under prolonged vibration, whereas the mechanical locking properties of rivets ensure a permanently secure fastening. This is the primary reason rivets are extensively employed in railway rolling stock, automotive chassis, and wind turbine structures.

Q5: Are rivets permanent?

Yes. Once installed, rivets form a permanent, non-removable connection. Should maintenance or replacement be required, disassembly must be achieved through drilling or mechanical cutting. Consequently, Rivmate engineers recommend evaluating future maintenance requirements during the design phase to determine whether to employ riveting or a detachable fastening method.

Discover Rivmate Structural Rivet & Bolt Solutions

In the field of structural fastening, Rivets are not always superior to Bolts. However, they do perform better in terms of shear resistance, vibration resistance and fatigue resistance. In contrast, bolts still have the advantage in scenarios that require high tensile loads, ease of maintenance and repeatable assembly. Therefore, the best solution needs to be reasonably selected and combined based on working conditions, load forms and usage cycles.

Contact us immediately to learn about Rivmate’s high-strength structural rivets and fastening solutions. Obtain the technical data sheet, selection recommendations and performance test report. Make each fastening operation achieve a perfect balance of structural reliability, manufacturing accuracy and operational safety.