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 7035-01-605-3375
NSN 5999-01-435-2300
NSN 6645-01-514-7901
NSN 5910-01-147-0146
NSN 4140-01-223-0116
NSN 6650-00-276-9838
NSN 6620-00-290-6505
NSN 5895-00-728-3655
NSN 2925-01-014-0118
NSN 5910-01-161-4718
NSN 4140-01-440-5856
NSN 6645-01-592-2557