These nuts are designed to secure ASTM A325 bolts in structural joints. Also known as heavy hex nuts, they are about 10% wider and taller than standard hex nuts and distribute the load over a large area.

Steel nuts without a finish are weldable and ready to be painted or finished.

Black-oxide steel nuts have a dark surface color and are mildly corrosion resistant in dry environments.

Hot-dipped galvanized steel nuts have a thick coating for good corrosion resistance. They must be used with other hot-dipped galvanized fasteners.

For technical drawings and 3-D models, click on a part number.

About half the height and 10% wider than standard nylon-insert locknuts, use these in low-clearance applications or jam one against an extra-wide hex nut to hold it in place. The nylon insert grips the bolt to resist loosening without damaging threads. They're reusable, but their holding power lessens with each use. Comparable in strength to Grade 8 bolts, these locknuts are about three times stronger than low-strength steel extra-wide thin locknuts.

Steel locknuts without a finish are ready to be welded, painted and finished.

Black-phosphate steel locknuts resist corrosion in wet environments.

For technical drawings and 3-D models, click on a part number.