Industrial Fastener · Nuts Series
Cap Nut / Acorn Nut
Cap nuts (also called acorn nuts or dome nuts) have a closed, domed top that conceals the bolt thread end. They serve both a decorative purpose and a protective function — sealing the bolt from contamination and protecting hands from a sharp thread end.
Product Overview
Cap Nut / Acorn Nut sourcing essentials
Cap nuts (also called acorn nuts or dome nuts) have a closed, domed top that conceals the bolt thread end. They serve both a decorative purpose and a protective function — sealing the bolt from contamination and protecting hands from a sharp thread end.
DIN 1587 (high crown), DIN 917 (low crown), ISO 4759
Carbon steel, Stainless 304/316, Brass
Cap nuts (also called acorn nuts or dome nuts) have a closed, domed top that conceals the bolt thread end. They serve both a decorative purpose...
Inspection records, lot labels, certificate options, and destination-ready packing.
Technical Data
Specification range
Final dimensions, mechanical properties, finish, and packing are confirmed against the RFQ and applicable standard.
| Standards | DIN 1587 (high crown), DIN 917 (low crown), ISO 4759 |
|---|---|
| Size Range | M3 – M30 |
| Material | Carbon steel, Stainless 304/316, Brass |
| Surface Finish | Zinc plated, Polished, Chrome, Stainless, Brass |
Common surface finishes
Select an option to review its sourcing note. Exact coating system, thickness, and corrosion requirement are confirmed with the order.
Quality Control
Checked before consolidation and export
Each order is matched to the specified standard and verified at practical control points before shipment.
RFQ confirmation
Standard, size, grade, pitch, finish, certificates, packing, and destination are locked before production.
Lot verification
Critical dimensions, thread fit, markings, finish appearance, and packing labels are sampled and recorded.
Shipment approval
Photos and required reports are organized before consolidated loading and export documentation.
Buyer Questions
Frequently asked questions
Can the bolt protrude through a cap nut?
No — the cap nut has a closed dome. The bolt length must be selected so the thread does not bottom out inside the nut. If the bolt is too long, it will hit the inside of the dome before the nut is fully tightened.
Ready to quote Cap Nut / Acorn Nut?
Send the standard, size, grade, finish, quantity, packing requirement, and destination. Availability and lead time are confirmed with the inquiry.