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 6620-01-428-7072
NSN 7035-01-040-6373
NSN 6110-00-819-4917
NSN 6105-01-462-6111
NSN 5960-01-284-4118
NSN 5990-01-419-0661
NSN 5930-01-342-6244
NSN 4140-01-627-6868
NSN 5920-01-212-9504
NSN 5999-01-435-6541
NSN 6645-00-292-5053
NSN 5905-01-344-7453