A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5990-00-845-2864
NSN 5855-01-241-1054
NSN 5945-01-415-5087
NSN 5975-01-432-9406
NSN 5910-00-969-3569
NSN 6130-01-430-0158
NSN 5835-00-711-3371
NSN 5905-00-775-4733
NSN 6320-01-302-5157
NSN 2925-01-483-2389
NSN 5935-01-406-3208
NSN 6130-00-469-0640