DIN 7331 specifies countersunk head semi-tubular rivets, designed for flush fastening applications where a smooth and flat surface finish is required after installation. These rivets feature a semi-tubular shank, which reduces installation force while maintaining strong mechanical properties.
Widely used in automotive, aerospace, electronics, and furniture manufacturing, DIN 7331 rivets provide secure and durable connections without the need for threads or welding. Their countersunk head design ensures a level surface, making them ideal for applications where protruding heads could interfere with functionality or aesthetics.
🔹 Key Features of DIN 7331 Rivets
✔ Countersunk Head Design: Allows for a flush finish when installed.
✔ Semi-Tubular Shank: Reduces force needed for installation while maintaining structural integrity.
✔ Lightweight & Strong: Suitable for applications requiring a balance of strength and weight reduction.
✔ Multiple Material Options: Available in steel, stainless steel, aluminum, and brass.
✔ Corrosion Resistance: Optional coatings such as zinc plating or anodizing for enhanced durability.
🔹 DIN 7331 Rivet Dimensions (mm)
| Nominal Diameter (d1) | Head Diameter (d2) | Head Height (k) | Shank Length (l) | Inner Diameter (d3) | Countersink Angle (α) |
|---|---|---|---|---|---|
| 2.5 | 5.0 | 1.2 | 4 – 20 | 1.0 | 90° |
| 3.0 | 6.0 | 1.5 | 5 – 25 | 1.2 | 90° |
| 4.0 | 8.0 | 2.0 | 6 – 30 | 1.6 | 90° |
| 5.0 | 10.0 | 2.5 | 8 – 35 | 2.0 | 90° |
| 6.0 | 12.0 | 3.0 | 10 – 40 | 2.4 | 90° |
📌 Note: The values in the table are approximate. Verify with official DIN 7331 documentation for precise tolerances.
🔹 Material & Surface Treatments
DIN 7331 semi-tubular rivets are manufactured in different materials to suit various applications:
- Carbon Steel: Provides high strength for industrial applications.
- Stainless Steel (A2, A4): Corrosion-resistant for outdoor and marine environments.
- Aluminum & Brass: Lightweight and corrosion-resistant options for automotive and electronics.
- Surface Coatings: Zinc-plated, nickel-plated, or anodized to improve corrosion resistance.
🔹 Applications of DIN 7331 Countersunk Head Rivets
DIN 7331 rivets are commonly used in:
✅ Automotive & Aerospace: Flush fastening for aerodynamic and aesthetic purposes.
✅ Sheet Metal Fabrication: Used for smooth and strong joints in industrial assemblies.
✅ Electronics & Appliances: Provides secure and clean fastening for enclosures.
✅ Furniture Manufacturing: Ensures seamless joints in metal and wooden structures.
✅ Industrial Machinery: Used in conveyor systems, equipment, and structural components.
📌 Important Notice on Standards Validity
This information is for reference purposes only. Users should consult official sources and updated standards to ensure compliance with current regulations. The validity of standards may change over time, so it is recommended to verify them through recognized engineering and standardization organizations (ISO, DIN, ANSI, etc.).
📌 Check with relevant standardization bodies in your region to confirm whether a specific standard is still valid and applicable. Regulations and industry requirements may vary based on region and application.