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 5905-01-146-2414
NSN 5920-01-489-7090
NSN 5960-00-443-1483
NSN 6685-01-553-3715
NSN 5910-00-533-6345
NSN 6610-01-543-8567
NSN 5930-00-156-3386
NSN 5835-00-309-2373
NSN 6240-01-133-1723
NSN 5998-01-469-8618
NSN 5945-00-279-3223
NSN 7035-01-302-5359