One bearing surface 0.500 spherica radius, counterbore end chamfered and undercut
No other part numbers with same form, fit, and function found.
A nut, circular in shape, which may have wrenching facilities such as flats, holes, protrusions, slots or splines in or on the periphery or in the face opposite the bearing surface. For items having a thickness (or height) exceeding two times the outside diameter, use post, electrical-mechanical equipment. See also nut (1), plain, knurled. (when height or thickness and/or outside diameter is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)
Classification: Copper screws, nuts, bolts, rivets, and other fasteners not threaded
NSN 6685-00-245-7722
NSN 5999-01-064-3768
NSN 5999-01-256-9903
NSN 4140-01-135-4617
NSN 6145-01-310-3296
NSN 6145-01-201-6515
NSN 6685-01-469-3137
NSN 6620-01-652-4349
NSN 5905-01-593-3045
NSN 6105-01-642-2323
NSN 5998-01-165-0339
NSN 6240-00-946-7858