Nylon locking nut is a round nut, and in its outer open four small slot, you can use the nut screw on the bolt, the locking nut should be equipped with a shaft washer, it can be used to make the small groove on the bolt and its peripheral groove relative to the fixed groove to prevent its loose . Bolt thread on the nuts embedded in the nylon extrusion, so that the nylon deformation, after installation, the nylon and the thread completely squeeze contact, the extruded nylon on the bolt has a lot of resilience, increased friction, so that the bolt is not easy to loosen.