A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6105-01-584-3987
NSN 7035-00-631-3782
NSN 2925-01-157-9204
NSN 7035-01-261-9850
NSN 6620-01-386-5914
NSN 5960-01-231-9119
NSN 5930-01-119-5131
NSN 5965-01-300-9664
NSN 6110-01-205-2287
NSN 5950-01-511-5909
NSN 6110-00-288-4179
NSN 5998-01-200-4102