7/8-9 NE Nylon Insert Lock Nut - Grade 2 - Carbon Steel - Zinc Clear Trivalent - Coarse - Pkg of 5

Nylon insert hex lock nuts provide a durable undersized washer that forms a compression grip that binds on the threads of the mating fastener to resist loosening. fasteners can be adjusted or removed after installation, while the locking feature resists loosening without the nuts being seated for limited reusability and long lasting reliability.