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 6220-01-524-5966
NSN 6240-01-085-1314
NSN 5990-01-538-6115
NSN 5930-01-237-1727
NSN 6105-00-772-0730
NSN 6105-01-605-1355
NSN 5985-00-285-8466
NSN 6105-00-725-4104
NSN 5925-01-024-9568
NSN 5985-01-170-6912
NSN 5910-01-479-4977
NSN 6240-00-169-1478