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Nylon lock nuts also called nyloc nuts, nylon-insert lock nuts, polymer-insert lock nuts, or elastic stop nuts, are six-sided nuts that have a locking feature to withstand vibrations and avoid loosening. They have a nylon insert located at the top that has a smaller internal diameter. This insert wraps around the thread thereby generating friction to prevent movement and lock the nut in place. Nylon lock nuts are made either from stainless, mild, or high-tensile steel and are available in various steel grades.