A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5975-01-238-7371
NSN 6220-00-316-2500
NSN 6105-00-399-0574
NSN 6240-01-045-3820
NSN 5950-00-916-9881
NSN 5965-01-138-1865
NSN 5915-00-473-9299
NSN 6135-01-396-0704
NSN 5935-01-282-5479
NSN 5910-01-591-5097
NSN 5915-00-783-4480
NSN 6240-01-650-1742