1/2-13 Two Way Reversible Hex Lock Nut Zinc and Wax (Pack Qty 400) BC-50NY by Shorpioen

This is the least expensive prevailing torque type of nut, designed for use with machine screws and low-carbon bolts (or 18-8 screws with the stainless nuts). It allows for automatic assembly because the top and bottom of the nut are identical. It creates a locking action even without being fully threaded onto its mating screw. | Steel: Nuts shall be made from a low-carbon steel which conforms to the following chemical composition requirements Carbon: 0.47% max.; Phosphorus: 0.12% max.; Sulfur: 0.23% max. Rockwell C28 maximum | 18-8 Stainless