With triangular base on bottom ofnut with 3 each drilled holes 0.070 inch id by 0.125 inch long by 0.105 inch thick
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 5895-00-494-0781
NSN 5895-00-461-8837
NSN 5998-00-904-7610
NSN 6150-01-628-3584
NSN 5935-00-081-8430
NSN 5855-00-472-2055
NSN 5905-01-192-5318
NSN 6135-01-560-8130
NSN 4140-01-036-1953
NSN 6320-01-216-1678
NSN 2925-01-011-8732
NSN 5925-00-594-0840