These metric locknuts have an irregularly shaped thread at the top of the nut that grips the bolt for a stronger hold than nylon-insert locknuts.Nylon lock Nut is hexagonal Nut used with Nylon lock Nut is hexagonal Nut used with bolts and washers of the same material finish and grade. The nylon ring creates rotational resistance when displaced by a mating male threaded fastener thus preventing loosening.Metric Lock Nuts. Use a locknut over or in place of a regular nut to resist loosening due to machine vibration or torque. There are two main types of lock nut. A nylon insert nut has a slightly smaller thread than the bolt to provide added grip.

The metric locknuts are precision manufactured on cold and hot forming equipment to ensure a uniform bearing area and chamfered top and to provide consistent prevailing-torque results. Applications: High volume assembly locknut.