About half the height and 10% wider than standard nylon-insert locknuts, these locknuts are often referred to as thin heavy locknuts. Use them in low-clearance applications or jam one against a heavy 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 the same locknut made with low-strength steel.

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.

Since they’re about half the height and 10% wider than standard nylon-insert locknuts, these locknuts are considered thin heavy locknuts. Use them in light duty low-clearance applications or jam one against a heavy 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.

Zinc-plated steel locknuts provide mild corrosion resistance in wet environments.

Black corrosion-resistant-coated steel locknuts are more corrosion resistant than zinc-plated locknuts in wet environments. They’re also known as black luster locknuts.

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

These locknuts have good chemical resistance and may be mildly magnetic. About half the height and 10% wider than standard nylon-insert locknuts, these locknuts are considered thin heavy locknuts. Use them in low-clearance applications or jam one against a heavy 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.

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

These locknuts have excellent resistance to chemicals and salt water. They’re known as thin heavy locknuts because they’re about half the height and 10% wider than standard nylon-insert locknuts. Use them in low-clearance applications or jam one against a heavy 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. They may be mildly magnetic.

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