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 6150-01-336-6540
NSN 6320-01-382-9676
NSN 5985-01-369-1578
NSN 6220-01-276-6536
NSN 6645-00-023-8386
NSN 5920-01-303-0240
NSN 5910-01-397-1441
NSN 5895-01-163-4468
NSN 5910-00-983-0022
NSN 6105-00-868-3006
NSN 5895-01-159-0288
NSN 5960-00-923-5047