5/16-18 Nylon Insert Hex Lock Nuts Stainless Locknuts, Hex Drive, Bright Finish, 304 Stainless Steel 18-8 SS, Coarse Thread, 100 of Pack

Nylon Insert Hex Locknuts Stainless Steel 304 (18/8) Nylon insert locknut is a kind of nut with nylon collar insert to resist turning.

When you install the nylon lock nut onto a bolt, the nylon insert wraps around the threads and locks the nut in place.

This gives a nylon lock nut a distinct advantage over a lock washer because the nylon lock nut is unaffected by vibration.

Its inner diameter might be slightly smaller than the major diameter of the bolt.

You probably feel a little resistance but it's normal.

The nylon insert locks the nut by friction against the screw under the applied radial compressive force.

Made of Stainless Steel 304 (18-8) which provides good strength and corrosion resistance in bad environments.