All-Metal Lock Nut

An all-metal lock nut is a nut with a locking feature that resists loosening from vibration. It has no plastic insert and relies on metal deformation or a prevailing torque design.

An all-metal lock nut holds a bolt or stud where vibration can loosen a plain nut. It takes a bolt or stud of the same thread and class, and often a washer under the nut. A spanner or socket sets it.

All-metal lock nuts are often made in steel, stainless steel, brass, nickel alloys or plastic. Stainless steel grades such as 304 and 316 are common for corrosion resistance. Nickel alloys are chosen for high temperature or chemical exposure.

This is a general guide to checking this kind of part. It says nothing about any supplier's parts.

Ask for a certificate of conformance that states the material and locking performance. On receipt, check the thread and locking feature for damage.