Nylon Insert Lock Nuts, NU Series, Zinc

GRADE A NYLON INSERT LOCKNUT, ZINC CLEAR CR+3 (INCH)
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Nylon inset lock nuts are basically a 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 of the screw when it's subject to vibration.