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 5975-00-843-2585
NSN 5996-01-618-7620
NSN 6685-00-242-6722
NSN 7035-00-320-5644
NSN 5935-01-003-6004
NSN 5990-00-679-6157
NSN 5915-00-421-9140
NSN 5905-00-209-1045
NSN 5960-01-632-6576
NSN 5996-01-202-1392
NSN 5910-01-201-5280
NSN 6610-01-383-7419