A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5910-01-444-3547
NSN 6685-00-514-6364
NSN 5910-01-363-9908
NSN 5945-00-816-2479
NSN 5975-01-122-6086
NSN 5905-00-611-4303
NSN 6685-01-202-5338
NSN 5999-01-331-0628
NSN 5915-00-786-3208
NSN 6130-01-364-7415
NSN 5905-00-408-5876
NSN 5975-01-415-5771