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Flanged Acorn (Dome) Nut – Black Oxide Stainless Steel
Flanged acorn nuts are designed to cover and protect exposed bolt threads while providing a clean, finished appearance. The domed cap fully encloses the threaded end, enhancing safety and aesthetics in visible applications. The integrated flange acts as a built-in washer, distributing clamping force evenly over a larger surface area. Serrated flange versions provide a locking action by biting into the mating surface to resist loosening under vibration, while smooth flange versions offer a non-locking alternative that will not damage the contact surface and allows for reuse.
Material & Finish
Manufactured from stainless steel with a black oxide finish, these nuts combine corrosion resistance with a distinctive dark appearance.
- Abrasion resistant, does not peel, chip or rub off
- Reduces friction, prevents galling
- Does not change the strength of the stainless steel
- Practically no dimensional change to base fastener
- The spray applied during the coating process wears off over time, revealing an attractive matte black finish
Use
Black oxide stainless flanged acorn nuts are widely used in automotive assemblies, motorsport applications, industrial machinery, architectural installations, agricultural equipment, food processing systems, and clean energy projects. They are ideal for installations where exposed fastener ends must be protected from damage, contamination, or injury while maintaining a professional appearance. The flanged design makes them particularly suitable for applications requiring improved load distribution and vibration resistance.
Also known as: dome nut, hexagon domed cap nut with integrated washer.
