Back Home / Fasteners / Nuts / LOCK NUT NYLON UNC ZINC 1/2″-13 GR 2 LOCK NUT NYLON UNC ZINC 1/2″-13 GR 2 SKU: LN1213 Categories: Fasteners, Nuts Hex nut with a nylon-filled collar at its back end. When a screw reaches the collar, the threads and nylon engage for a tight, frictional fit. Restricts movement of the screw when it is subjected to vibration. Designed to be used with like-material machine screws and bolts. Reusable. Less expensive than Grade C Stover lock nuts. The nylon collar will begin to deteriorate at temperature from 150° to 350° F. Proof load: 90,000 psi. minimum. Size: 1/2″-13. Zinc plated. Case Quantity: 50 Log In For Pricing