A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5930-00-876-3243
NSN 6610-01-475-1921
NSN 5895-01-285-5086
NSN 6220-01-359-5767
NSN 2925-00-993-7715
NSN 6645-01-367-2581
NSN 5996-00-885-5114
NSN 5945-01-370-3463
NSN 5925-01-115-0209
NSN 6220-01-142-5840
NSN 5999-00-161-4685
NSN 6110-00-403-7118