3 grooves 0.312 in. W 0.500 in. Lg on periphery
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 6110-01-527-1971
NSN 5950-01-282-9852
NSN 6620-01-185-5541
NSN 6130-01-464-4286
NSN 5910-01-317-3865
NSN 2925-01-462-1620
NSN 5960-01-104-0074
NSN 5835-01-030-2519
NSN 6105-01-278-9220
NSN 5985-01-338-6686
NSN 6685-00-779-0774
NSN 5930-01-327-6975