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 4140-00-365-2531
NSN 6620-01-541-5480
NSN 5935-00-618-0209
NSN 5895-01-533-5725
NSN 5998-01-522-6000
NSN 5835-01-623-3328
NSN 5910-01-276-5581
NSN 6105-01-604-3435
NSN 5895-00-959-2284
NSN 6110-00-635-5275
NSN 5996-00-389-7404
NSN 5895-00-143-4194