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 6650-00-287-5868
NSN 6220-01-084-0287
NSN 6240-01-271-2222
NSN 5990-01-160-6978
NSN 7035-01-385-3628
NSN 6145-01-509-1059
NSN 5998-01-503-3128
NSN 5920-01-074-4333
NSN 6240-01-556-7096
NSN 6320-01-362-4863
NSN 5960-01-486-1996
NSN 5835-01-457-7951