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 5855-00-494-9581
NSN 5990-01-548-3711
NSN 5965-00-825-6734
NSN 5975-01-121-0461
NSN 5915-01-342-3139
NSN 5925-01-412-6175
NSN 6220-01-112-2706
NSN 5985-00-243-4160
NSN 6130-00-919-0062
NSN 5835-00-470-4295
NSN 5915-01-652-5881
NSN 5920-00-826-0949