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 5996-00-344-1250
NSN 6135-01-390-1841
NSN 5855-01-469-7732
NSN 5905-01-580-3012
NSN 5990-00-488-1091
NSN 2925-01-385-6661
NSN 6150-01-206-7986
NSN 5905-01-266-0277
NSN 6645-00-371-1861
NSN 6650-00-434-0188
NSN 7035-01-068-5077
NSN 6650-01-028-2820