A locknut, also known as a lock nut,
Locking Nut, prevailing torque nut,stiff nut or elastic stop nut, is a nut that resists loosening under vibrations and torque. Elastic stop nuts and prevailing torque nuts are of the particular type where some portion of the nut deforms elastically to provide a locking action.The first type used fiber instead of nylon and was invented in 1931.
Locknuts, jam nuts, lock washers, and thread-locking fluid are ways to prevent vibration from loosening a bolted joint.
