Includes inch thread sizes. These Grade 8 steel locknuts are 25% stronger than our medium-strength steel nylon-insert locknuts.

Threads at the top of these metric locknuts expand to grip the bolt on all sides for a stronger hold than distorted-thread locknuts.

Made from 18-8 stainless steel, these flex top locknuts have good chemical resistance and may be mildly magnetic.

These locknuts have a curved washer that acts as a spring for easy installation and mild vibration resistance. The smooth rim makes them less likely to scratch materials when tightened than locknuts with a tooth lock washer.

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.