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 5945-01-594-2332
NSN 6150-01-259-7888
NSN 6240-00-583-9863
NSN 5920-01-261-4801
NSN 7035-01-145-5059
NSN 5915-01-378-7039
NSN 6320-00-300-5556
NSN 4140-01-507-4469
NSN 5998-00-329-9586
NSN 6320-01-285-1922
NSN 5935-00-672-5645
NSN 6610-01-313-4276