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 5930-00-692-4996
NSN 6240-00-937-6083
NSN 6645-01-012-5972
NSN 6240-00-368-8541
NSN 6240-00-758-6392
NSN 6135-00-170-8819
NSN 6645-00-816-5337
NSN 5915-01-089-8809
NSN 6150-01-476-2470
NSN 5895-01-485-3952
NSN 6685-01-087-9081
NSN 5925-00-529-3950