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 5915-00-208-4686
NSN 5985-01-005-5274
NSN 6320-01-054-3046
NSN 6320-01-512-2031
NSN 6110-01-410-8934
NSN 2925-00-412-2046
NSN 5910-00-014-2558
NSN 5935-01-403-2844
NSN 6150-00-015-7284
NSN 5835-00-682-5177
NSN 6145-00-188-3657
NSN 5925-01-497-4490