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
 
 
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