A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5915-00-902-8664
NSN 5996-01-546-2025
NSN 5920-01-611-4892
NSN 6645-01-495-0939
NSN 6130-00-258-9169
NSN 5998-01-170-2069
NSN 2925-01-430-4206
NSN 5910-00-221-2889
NSN 6145-00-992-7617
NSN 6145-01-436-2146
NSN 5915-00-733-7439
NSN 5998-00-813-9216