A nut, flat on top and bottom having 6 flat sides. For items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see locknut, electrical conduit. See also locknut, tube fitting. 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 6240-00-088-5989
NSN 5998-01-012-8730
NSN 4140-01-275-2729
NSN 5835-01-363-4527
NSN 5930-01-065-4623
NSN 6620-00-115-9050
NSN 6150-00-386-1996
NSN 6110-01-332-7826
NSN 6145-01-051-7012
NSN 5945-00-197-7673
NSN 5950-01-016-6942
NSN 5945-01-121-0141