A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5975-01-499-3262
NSN 5905-01-430-5406
NSN 2925-00-236-9986
NSN 6620-01-325-6295
NSN 6130-01-212-3832
NSN 5960-01-472-5263
NSN 6130-01-642-7121
NSN 5985-01-525-2761
NSN 5965-01-524-4979
NSN 6240-01-140-4360
NSN 5990-01-492-6575
NSN 6130-01-055-2227