One bearing surface has concave shape to threads
No other part numbers with same form, fit, and function found.
A nut, round in shape, having all or part of its outer surface knurled. It may have provisions for external wrenching. For items having a thickness (or height) exceeding two times the outside diameter, use post, electrical-mechanical equipment. See also nut (1), plain, round. (when height or thickness, and/or outside diameter is designated as a tolerance dimension, the maximum dimension will be used to determine compliance).
Classification: Nuts of iron or steel
NSN 7035-01-509-1959
NSN 5960-01-399-4327
NSN 6620-01-643-6817
NSN 6110-01-200-7447
NSN 5930-01-427-3676
NSN 6150-01-208-2238
NSN 6645-01-137-7974
NSN 6105-01-452-9935
NSN 5935-00-071-8831
NSN 5985-00-506-0532
NSN 6240-00-522-3998
NSN 5965-01-208-3488