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 5855-01-417-3250
NSN 6110-01-519-9131
NSN 6145-00-239-1304
NSN 6150-01-463-1854
NSN 6620-01-383-7519
NSN 5950-01-634-0677
NSN 7035-01-106-3476
NSN 6650-01-145-5173
NSN 5905-00-061-8602
NSN 6130-00-486-0570
NSN 5998-01-615-2017
NSN 5910-01-075-0862