A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5996-01-356-7346
NSN 6610-00-194-0676
NSN 5985-01-445-3482
NSN 4140-01-364-0109
NSN 2925-00-115-5857
NSN 5985-00-670-0176
NSN 6220-01-459-8017
NSN 5945-00-413-2659
NSN 4140-01-359-1665
NSN 5895-01-612-2943
NSN 5925-01-028-6504
NSN 6685-01-031-8827