A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6220-01-462-2613
NSN 6220-00-103-9973
NSN 6240-01-396-3109
NSN 6320-01-371-3047
NSN 7035-01-509-1959
NSN 6220-01-605-5991
NSN 5975-01-580-5490
NSN 6240-01-188-7282
NSN 5905-00-932-3323
NSN 6145-01-249-4329
NSN 5915-01-325-9426
NSN 5950-00-832-0560