A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5975-01-037-2796
NSN 6150-01-176-5651
NSN 6150-00-456-8509
NSN 5975-01-248-3717
NSN 6130-01-422-1850
NSN 5910-01-026-4009
NSN 6620-01-600-0479
NSN 5915-01-116-2932
NSN 5965-01-422-9770
NSN 6105-01-599-7133
NSN 5910-00-836-8588
NSN 5990-00-019-2486