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 6110-01-534-4567
NSN 5985-01-220-7205
NSN 5935-00-559-4023
NSN 5895-01-330-8806
NSN 5920-00-491-9163
NSN 6130-00-596-9565
NSN 5996-01-248-4383
NSN 5905-01-206-8685
NSN 5930-01-517-3095
NSN 5965-01-513-9978
NSN 5999-01-170-5722
NSN 7035-01-201-9850