4 wrenching flats
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: Nuts of iron or steel
NSN 6135-01-386-5709
NSN 6220-00-379-4044
NSN 4140-00-083-1120
NSN 6645-01-326-7316
NSN 6145-01-068-4668
NSN 4140-00-406-3577
NSN 5985-01-439-4649
NSN 5925-01-590-0171
NSN 5915-01-555-8852
NSN 5998-00-171-1134
NSN 6135-01-526-0144
NSN 5930-01-053-6780