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Lock Nut

A lock nut (also known as a locking nut, jam nuts, lock washers, prevailing torque nut, stiff nut or elastic stop nut) is a nut that resists loosening under vibrations and torque. The elastic stop nut and prevailing torque nut is a particular type where some portion of the nut deforms elastically to provide a locking action.

A close look at the lock nut shows that it has a nylon sleeve. As the nut is tightened, the thread on the shaft / axle cuts into the nylon, holding it firmly in position. If a normal nut is used, it will loosen because of friction and vibration of the system.

Lock nuts are very useful and are used by engineers and mechanics.

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