Tri-groove nuts are narrower than sloped and drilled spanner nuts to fit in tight spaces. Install with a tri-groove socket bit and either a drive handle or an open-end wrench.

The most tamper-resistant nuts we offer, these have a hex head that breaks away upon tightening, leaving a non-removable cone. Install with a standard wrench.

Sloped sides make these nuts difficult to grasp with standard hand tools to reduce the risk of unwanted removal.

These locknuts have an irregularly shaped thread at the top of the nut that grips the bolt for a stronger hold than nylon-insert locknuts.

Comparable in strength to Grade 8 bolts, these locknuts are about 25% stronger than medium-strength steel locknuts.

These Grade 9 locknuts are about 20% stronger than high-strength steel locknuts and are often used in heavy machinery, such as earth-moving equipment.