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 7035-01-249-4547
NSN 5999-01-415-5090
NSN 5960-01-411-5899
NSN 6320-00-646-3311
NSN 5996-00-682-2226
NSN 6130-01-209-0115
NSN 5925-01-431-5460
NSN 5910-01-613-8842
NSN 5835-01-485-0210
NSN 6105-01-307-7428
NSN 4140-01-570-8071
NSN 5975-00-305-4604