A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6320-01-355-2367
NSN 6105-00-838-9409
NSN 5920-01-389-2077
NSN 5985-00-561-0047
NSN 2925-00-474-4990
NSN 5935-00-797-2188
NSN 5855-01-570-3195
NSN 6610-00-840-6187
NSN 6220-01-382-2696
NSN 5985-00-156-4536
NSN 6130-01-276-2776
NSN 5985-01-089-9514