Lock washers and lock nuts prevent this from happening. lock washers, when tightened to the required torque beneath an ordinary fastener, will exert a spring tension against the fastener to keep it from vibrating loose. lock nuts typically have a malleable insert that deforms to grip the threads of the bolts they’re threaded on to, which in turn keep the nuts from vibrating loose.
Hex nuts with lock washers are used to reduce loosening caused by vibration. they have a spinning lock washer with external teeth that dig into the bearing surface, which locks the fastener in place.
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