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 6150-00-012-2715
NSN 5990-01-582-5238
NSN 5996-01-553-3705
NSN 5950-01-114-5759
NSN 6320-01-578-6006
NSN 5945-01-370-9728
NSN 6620-01-461-6427
NSN 5975-01-308-5624
NSN 6685-01-503-1087
NSN 7035-01-386-5722
NSN 5930-00-459-4392
NSN 5905-00-814-0289