About Nylon Insert Locknuts:Nylon Insert Lock Nuts are also known as stop nuts. Lock nuts are used for fastening to a bolt when mechanically joining materials together. The bolt threads into the nylon material are located at the top of the nut. The stainless steel hexagonal nylon lock nut is the hexagonal nut, which is screwed together with the bolt or the screw for the fastening function. These lock nuts greatly reduce loosening under vibrations and torque with a nylon insert.It is an original part that all production machinery must use. The stainless steel lock nut is the mechanical equipment The tightly connected parts can only be connected together through the inner thread, stainless steel lock nuts and screws of the same specification. Stainless steel self-locking nuts have a much better anti-rust effect than ordinary galvanized lock nuts. It is equipped with a nylon washer to prevent loosening. Its specifications are inches.If you have any questions when using, please feel free to contact us by Amazon message.