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 6220-01-029-5037
NSN 6610-01-088-5871
NSN 5915-01-451-4332
NSN 5975-00-478-2126
NSN 6650-00-824-5510
NSN 5855-01-178-6396
NSN 5990-00-422-2093
NSN 5895-01-109-1801
NSN 4140-01-231-4863
NSN 5910-00-677-7226
NSN 5935-01-470-1345
NSN 7035-01-462-5766