A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5996-01-341-7403
NSN 6685-01-116-8177
NSN 5930-00-868-4490
NSN 5965-00-520-2686
NSN 6150-00-218-9618
NSN 5925-01-474-6358
NSN 5835-00-147-5062
NSN 6620-01-495-7446
NSN 6110-00-816-9715
NSN 5999-00-678-4271
NSN 6240-01-023-2013
NSN 6220-00-111-3188