A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6105-01-278-9220
NSN 5975-01-590-8745
NSN 6240-00-826-8426
NSN 5945-00-360-6512
NSN 5985-01-424-0768
NSN 5990-01-385-6634
NSN 6110-01-027-1501
NSN 6130-00-240-4765
NSN 5855-01-288-6341
NSN 5835-01-012-5065
NSN 5999-00-131-4506
NSN 5905-00-835-5000