Acorn Cap Nuts (DIN 1587) – 304 (A2-70) Stainless Steel Dome Nuts
These 304 (A2-70) stainless steel acorn cap nuts (also called dome nuts or cover nuts) are made to DIN 1587. The closed domed head completely covers the protruding bolt end — protecting the thread from damage and eliminating sharp edges, while giving a clean decorative finish.
Technical Specifications
| Parameter | Specification |
|---|---|
| Standard | DIN 1587 |
| Nut Type | Acorn / Cap Nut (closed dome) |
| Thread | M4 – M20 (Metric Coarse, Right Hand) |
| Material | A2-70 (304) Stainless Steel |
| Surface Finish | Passivated |
| MOQ | 5,000 pcs (M3–M12), 1,000 pcs (M14+) |
| Lead Time | 5-12 days (standard), 15-25 days (custom) |
| Packaging | Bulk in cartons / Plastic bags / Custom labeling |
Applications
- Architectural railings and balustrades
- Furniture and fixtures with exposed fasteners
- Automotive and motorcycle trim
- Playground and public equipment (safety — no sharp edges)
- Decorative exposed bolted joints
Certifications
ISO 9001:2015 certified manufacturing. Material test certificates (MTC) per EN 10204 3.1 available on request. RoHS and REACH compliant.
Frequently Asked Questions
What is an acorn nut used for?
An acorn (cap) nut has a closed domed top that completely covers the protruding end of the bolt. It protects the thread from damage and corrosion, removes the sharp thread edge for safety, and gives exposed joints a clean, finished appearance.
What is the difference between an acorn nut and a standard hex nut?
A standard hex nut leaves the bolt thread exposed. An acorn nut (DIN 1587) fully encloses the bolt end inside a dome, making it the preferred choice for visible, decorative or safety-critical joints.
Can acorn nuts be used outdoors?
Yes. The A2-70 (304) stainless steel construction with passivated finish provides excellent resistance to atmospheric corrosion, making these nuts suitable for outdoor railings, furniture and marine-adjacent installations.
Do you provide material certificates?
Yes. Material test certificates per EN 10204 3.1 are available on request, and our manufacturing is ISO 9001:2015 certified. RoHS and REACH compliance documentation can also be provided.