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 5905-01-160-0044
NSN 5935-00-715-1147
NSN 4140-01-545-7754
NSN 5945-01-452-1067
NSN 6650-01-440-3520
NSN 5985-00-778-5164
NSN 6150-00-948-1797
NSN 7035-01-595-5270
NSN 6240-01-386-5952
NSN 6620-00-716-0001
NSN 5920-01-164-8260
NSN 5998-01-185-5980