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 5905-01-535-9320
NSN 5835-01-327-6324
NSN 6685-01-377-9137
NSN 7035-00-922-5700
NSN 5930-01-505-0143
NSN 6240-01-365-7996
NSN 5990-00-111-3614
NSN 5998-01-032-0420
NSN 5999-00-666-3838
NSN 5915-00-225-6867
NSN 7035-01-591-8305
NSN 6650-01-317-7975