Self‑locking nut is a nut with self-locking function to resist loosening under vibration and dynamic load. The common type is nylon insert lock nut, the nylon ring interferes with screw thread to generate friction resistance. It can be reused for a limited number of times without damaging bolt threads. Material: carbon steel, stainless steel; finishes: zinc plated, black oxide. Widely used in machinery, automotive and electronic assemblies.