Positive locking device

A positive locking device is a device used in conjunction with a fastener in order to positively lock the fastener. This means that the fastener can not work loose from vibrations. The following is a list of positive locking devices:^[1]

A split beam nut and a split pin
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

References

^ Timings, Roger Leslie (2005), Newnes Mechanical Engineer's Pocket Book (3rd. ed.), Newnes, ISBN 9780750665087, http://books.google.com/?id=IZdDk1cMlLcC.