Bolt size unc 5/16 inch and metric
No other part numbers with same form, fit, and function found.
A washer which is usually round with a centrally located hole. Its edges and two bearing surfaces are so designed that applied pressure brings into play the spring tension and/or frictional locking principle which materially resists any tendency toward turning. It may be made of one or two pieces
Classification: Spring washers and other lock washers, iron or steel
NSN 5920-01-050-7474
NSN 5950-00-777-4134
NSN 6145-01-560-2978
NSN 6685-01-641-3574
NSN 5960-01-256-4719
NSN 5920-01-449-2172
NSN 5975-01-571-9579
NSN 6320-01-616-0843
NSN 5990-01-452-0911
NSN 6685-01-449-2450
NSN 5930-01-399-7649
NSN 5985-00-918-2962