A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5950-00-312-5369
NSN 6685-01-258-2455
NSN 5925-00-342-3637
NSN 5975-00-361-7793
NSN 5950-00-872-1362
NSN 6620-01-327-3011
NSN 5915-00-054-4029
NSN 5975-00-553-3998
NSN 5925-00-932-3027
NSN 5920-01-303-6841
NSN 6220-01-328-6574
NSN 6130-00-670-7758