Positive locking device

A positive locking device is a device used in conjunction with a fastener in order to lock the fastener. This means that the fastener cannot work loose from vibrations. The following is a list of positive locking devices:

A split beam nut
A castellated nut and a split pin
A hex nut or cap screw and a tab washer
A hex nut or cap screw and a lock plate
Safety wiring with various types of fasteners

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