A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5930-01-571-7289
NSN 6620-01-542-0494
NSN 5905-01-322-7542
NSN 5965-00-104-3121
NSN 6145-01-461-8062
NSN 6320-00-483-0451
NSN 2925-00-555-4578
NSN 6150-00-596-9882
NSN 5998-01-588-6863
NSN 5930-00-393-3930
NSN 5945-01-154-0881
NSN 6220-01-479-1289