Locknuts are commonly used to attach wheel rims to threaded bolt shafts. The nut "locks" because of a nylon insert that lines the center hole of the nut, which allows it to grip or lock onto the threads of the shaft. If the nylon insert becomes stripped, then removing the locknut can be difficult. There are three ways to remove a stripped locknut; try the easiest one before going on to the next technique. If all else fails, you will have to cut the locknut off by hand.

Nylon locknuts differ from a standard hex nut in that they have a nylon insert secured within lockthe nut. The nylon insert is located in a tapered section located at the back of the nut. When you install the nylon locknut onto a bolt or threaded stud, the nylon insert wraps around the threads and locks the nut in place. This gives a nylon locknut a distinct advantage over a lock washer when the bolt or threaded stud is subject to vibration, as the nylon locknut is unaffected by vibration.