A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5835-01-346-8909
NSN 5905-01-268-2661
NSN 5990-00-965-0495
NSN 5835-01-396-0640
NSN 2925-01-318-8853
NSN 2925-01-157-9204
NSN 6220-01-068-3100
NSN 5996-01-211-3562
NSN 5975-00-456-2257
NSN 6645-01-523-7171
NSN 5835-00-192-4843
NSN 5945-00-737-8083