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 5999-01-634-0576
NSN 6220-00-248-4483
NSN 5855-01-357-7907
NSN 5999-00-703-2008
NSN 5920-01-139-5973
NSN 6685-01-067-8474
NSN 5965-01-341-1480
NSN 5855-01-538-8616
NSN 6650-01-444-2152
NSN 6320-01-119-3935
NSN 5925-00-755-6504
NSN 2925-01-446-6523