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 2925-00-422-5159
NSN 6105-01-188-0390
NSN 5905-01-599-0074
NSN 6105-01-241-7525
NSN 6150-00-338-7354
NSN 4140-00-456-6139
NSN 5915-01-161-7353
NSN 6150-01-436-2746
NSN 6685-01-386-7239
NSN 5835-01-397-2865
NSN 4140-00-969-3943
NSN 5920-01-535-5340