A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6110-00-669-6726
NSN 5985-01-028-0015
NSN 5935-01-364-0161
NSN 5975-01-146-4796
NSN 2925-01-421-9665
NSN 6685-01-382-1366
NSN 5990-00-730-6269
NSN 5990-01-107-1003
NSN 5975-00-673-9869
NSN 6110-01-633-9660
NSN 6105-00-066-4529
NSN 5935-00-968-0370