A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 6105-00-256-0113
NSN 5930-01-381-6277
NSN 5960-01-468-4407
NSN 5945-01-315-9553
NSN 6145-01-515-9871
NSN 6150-00-862-3247
NSN 6650-00-954-4428
NSN 5905-01-485-3050
NSN 6130-01-123-2694
NSN 2925-01-113-6904
NSN 5935-01-586-3856
NSN 6105-01-396-2195