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 6105-00-195-7065
NSN 4140-00-775-0808
NSN 6320-01-246-4390
NSN 5985-00-758-2056
NSN 5925-00-603-8077
NSN 6685-00-941-0534
NSN 5855-01-594-2892
NSN 5920-01-211-4365
NSN 6685-01-500-9530
NSN 6610-00-146-7028
NSN 5990-00-578-8850
NSN 5985-00-466-3574