Tapered washer
Tab washer
Internally toothed washer
Machine washer
Circlip
Wing nut
Castle nut
Self locking nut
Permit the clearance
Decrease frictional grip
Increase the frictional grip
Loosen the nut due to vibration
Split pin
internal circlip
Frictional locking pin
EXternal circlip
Plain washer
Bolt and chuck nut
