A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5965-00-777-7037
NSN 7035-01-157-0028
NSN 5950-01-078-2807
NSN 5920-01-338-0707
NSN 5925-01-496-3953
NSN 5935-01-578-6762
NSN 5935-01-501-9042
NSN 6130-00-566-0347
NSN 6135-01-222-0703
NSN 5925-01-089-6970
NSN 5945-01-583-1514
NSN 5965-00-253-1302