A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6145-01-101-8211
NSN 5895-01-288-7533
NSN 5998-01-195-2291
NSN 5990-01-493-4039
NSN 6150-00-185-9995
NSN 6645-00-920-1412
NSN 5895-00-734-1987
NSN 6150-00-935-0369
NSN 5930-01-607-1823
NSN 6145-01-381-2529
NSN 5895-01-240-0569
NSN 5965-01-305-2858