Hex nut with a nylon-filled collar at its back end. When a screw reaches the collar, the threads and nylon form a tight, frictional fit, restricting movement on the screw when it is subjected to vibration.
Designed to be used with like-material machine screws and bolts. It is able to be reused more times than a two-way reversible nut. Nylon will being to deteriorate at temperatures from 150-300F.
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