1/2-13 Flex Type Hex Lock Nut Full Height Light Cadmium and Wax, Pkg of 100

1/4-20 Serrated Flange Hex Lock Nuts Case Hardened HR15N 78/90 Zinc Bake. Hex head screws are designed to be driven by a wrench or pneumatic tools.

External tooth lock nuts are nuts attached with lock washers typically used to help with convenience of assembly.

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.