A rivet is a commonly used permanent fastener that securely joins two or more materials together. It is usually made of metal and installed by inserting it into pre-drilled holes, then applying pressure or impact to its tail end to cause plastic deformation, thereby locking it in place. Once riveted, the joint is difficult to remove without damaging the parts, making rivets widely used in structures that require strong and reliable connections.
Common Features of Rivets
- Shape: Consists of a cylindrical shank and a pre-formed head; after installation, the tail end is deformed to form a “second head.”
- Materials: Aluminum, steel, stainless steel, copper, etc.
- Installation Method: Installed using manual or pneumatic riveting tools to create a non-removable connection.
Common Types of Rivets
- Solid Rivet — High strength; used in load-bearing structures such as bridges and aircraft.
- Blind Rivet (Pop Rivet) — Easy installation; can be set from one side, suitable for sheet metal connections.
- Hollow / Semi-Tubular Rivet — Requires less force; used in lightweight structures or decorative applications.
Why Use Rivets?
Compared with threaded fasteners, rivets have several advantages:
- Permanent fastening: Once installed, rivets do not loosen from vibration, making them ideal for structures under shear loads and impacts.
- Single-sided installation: Can be installed from one side where the back is inaccessible (e.g., aircraft skin, metal housings).
- Weight control: Aluminum rivets are lightweight, perfect for weight-sensitive designs.
- Environmental resistance: Stainless steel rivets are corrosion-resistant for harsh conditions; aluminum rivets are cost-effective for general environments.
- High efficiency & low cost: Riveting is fast, ideal for mass production, and requires little maintenance for loosening.
Stainless Steel Rivets
Stainless steel rivets, made from grades such as 304, 305, and 316, offer excellent strength and corrosion resistance, making them ideal for outdoor, humid, marine, and chemical environments. Grade 316 provides superior resistance to chloride-induced corrosion, making it the preferred choice for marine and coastal applications. Due to their higher hardness, stainless steel rivets require more force or specialized tools during installation but deliver a strong and long-lasting connection.
Aluminum Rivets
Aluminum rivets are lightweight, corrosion-resistant, and cost-effective, making them ideal for applications where weight reduction is critical, such as aerospace, transportation, and light equipment. Aluminum naturally forms a dense oxide film that offers good protection, but in seawater or when in contact with stainless steel, galvanic corrosion may occur. In dissimilar metal joints, it is recommended to use insulating washers or coatings. Aluminum rivets are softer, require less force to install, and enable faster assembly.
Stainless Steel vs Aluminum Rivets
| Feature | Stainless Steel Rivets | Aluminum Rivets |
| Strength | High strength, excellent shear and tensile resistance | Lower strength, suitable for light loads |
| Corrosion Resistance | 304/316 are corrosion-resistant; 316 recommended for marine use | Forms oxide layer for corrosion resistance, but prone to galvanic corrosion in seawater or contact with stainless steel |
| Weight | Heavier | Very light, ideal for weight reduction |
| Workability | Harder, requires more force or special tools to install | Softer, easy to install |
| Cost | Higher | Lower |
| Compatibility with Aluminum Parts | May cause galvanic corrosion (requires insulation) | Same material as aluminum parts, low corrosion risk |
Material Selection Recommendations
- Outdoor, humid, chemical, or marine environments → Use stainless steel rivets (preferably Grade 316)
- Aerospace, transportation, and lightweight equipment → Use aluminum rivets
- Aluminum-to-stainless connections → Add insulating washers or coatings to prevent galvanic corrosion
- Cost-sensitive, low-strength applications → Aluminum rivets are an economical choice
FAQs About Stainless Steel vs. Aluminum Rivets
Stainless steel rivets (preferably 316) are recommended due to their superior corrosion resistance in wet, salty, or chemical environments.
Aluminum rivets are best used with aluminum parts to avoid galvanic corrosion. When joining aluminum to stainless steel, use insulating washers or coatings.
Stainless steel rivets are harder and require more force or specialized tools. Aluminum rivets are softer and easier to install, allowing faster assembly.
Aluminum rivets are generally less expensive and suitable for applications with lower strength requirements. Stainless steel rivets are higher in cost but offer greater strength and durability.
Both provide permanent fastening and resist loosening from vibration, unlike threaded fasteners.
Contact MT.BOLTS
MT.BOLTS specializes in the manufacturing and supply of Steel Fasteners, including screws, bolts, nuts, and washers. Our products conform to international standards (ANSI / ASTM / DIN / ISO / JIS) and are available in various materials, dimensions, and surface finishes.
Contact us today to learn more about fasteners and to procure high-quality products. Our technical team is ready to provide expert support and custom selection solutions.
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