Nylon insert lock nut is a prevailing self-locking nut fitted with a nylon ring insert. During tightening, the nylon ring deforms and grips the screw thread to create friction resistance against rotation. It can resist loosening caused by vibration and dynamic load without damaging the bolt thread. Material: carbon steel, stainless steel; finishes: zinc plated, black oxide. Widely used in machinery, automotive and electronic assemblies.