Self Locking Domed Cap Nut

You’ll find the self locking domed cap nuts in car engines, chassis parts, airplane panels, and heavy-duty machines like tractors or cranes. Built with hardened steel, they lock tight on their own-no rattling loose, even with constant shaking. Free samples available to test before you commit.

Product details and parameters

The self locking domed cap nut is a specialized fastener designed to stay securely in place even under heavy vibration or movement. It combines a domed cap shape with a built-in locking mechanism, usually a nylon insert or deformed threads, to prevent loosening over time. Unlike regular nuts, the self locking domed cap nut offers both a finished look (thanks to its smooth dome) and reliable performance. It’s commonly used in machinery, automotive, and construction projects where safety and durability are top priorities.

Self locking domed cap nuts save time and hassle. You don't have to keep checking if they are still tight, and you don't have to worry about them loosening.That dome top also covers up sharp points—no more scratched arms on playground equipment or snagged clothes on furniture. For stuff like machines or vehicles, it means less downtime because you’re not always fixing loose bolts. Sure, they cost a bit more, but think of it like buying a good phone case—it’s basic protection that just works. No fancy tricks, just fewer headaches.

Our market distribution

Why choose us

Xiaoguo®’s self locking domed cap nut is made from hardened steel—no fancy terms, just tough stuff. They lock tight on their own, so vibrations won’t shake them loose. Perfect for fixing machinery or car parts. Bulk orders? We’ve got you covered with factory prices.