A nut, flat on top and bottom, having 4 flat sides. For items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)
NSN 5920-01-415-5020
NSN 5960-00-401-0794
NSN 5930-01-423-8976
NSN 6240-01-116-3382
NSN 5835-01-382-4592
NSN 5998-01-217-1754
NSN 6650-01-327-0323
NSN 6650-01-034-6040
NSN 5945-00-081-4030
NSN 5930-00-383-9513
NSN 5999-01-376-4009
NSN 6130-01-295-8954