Self-Locking Nut with their internal thread form the counterpart of a screw and ensure that the attached screw does not come loose. Lock nuts are resistant to vibration & torque. Nuts are designed to wear faster than bolts. For self-locking nuts, it is acceptable to reuse them as long as there is still some locking action. The number of components is also reduced by the self-locking feature of the nut since no further securing elements are needed. Lock nuts feature a unique design that prevents them from loosening when exposed to vibrations. Because the nut insert hole is smaller than the bolt it creates so much friction between all of the threads that are in contact that the nut cannot vibrate loose.