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 5895-01-384-3736
NSN 6685-01-061-5508
NSN 6320-01-612-7035
NSN 6240-01-068-3491
NSN 5915-01-532-6173
NSN 5965-00-393-1294
NSN 5935-01-327-2759
NSN 5920-01-006-0417
NSN 5905-01-641-4362
NSN 6645-01-578-1920
NSN 6145-01-519-8210
NSN 2925-01-037-5383