1/2-13 Serrated Flange Hex Lock Nuts Case Hardened HR15N 78/90 Zinc Bake, Pkg of 250

5/16-18 Nylon Insert Flange Stop Hex Lock Nut Zinc. Hex head screws are designed to be driven by a wrench or pneumatic tools.

1 1/4-12 Thin Pattern Nylon Insert Hex Lock Nut Fine Thread Zinc Yellow. Hex head screws are designed to be driven by a wrench or pneumatic tools.

Lock nuts remain stiff when placed on bolts. They are useful in applications where vibration may cause a fastener to come loose. Lock nuts are also able to be used to keep other nuts in place by threading over them.

Hex Nut with assembled external tooth lock washer. Washer is free-spinning and provides clamping to mating material when tightened.

Nylon Lock Nuts contain a nylon collar insert to help prevent turning. The insert deforms elastically over screw threads. The nylon insert applies a compressive force against the screw to lock the nut.