Nylon Insert Lock Nuts are also known as stop nuts. Lock nuts are used for fastening to a bolt when mechanically joining materials together. The bolt threads into the nylon material are located at the top of the nut. The purpose of the nylon insert is to prevent backing off or loosening from vibration.
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Nylon Insert Lock Nuts have a captive undersized nylon washer that creates friction with the mating threads to prevent loosening
Helps resist the effects of vibration and other forces