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 6110-01-309-3502
NSN 6105-01-559-1826
NSN 5905-00-185-6237
NSN 6150-00-374-5246
NSN 5999-01-206-0597
NSN 6610-00-960-5711
NSN 6130-00-107-0414
NSN 5915-01-311-3213
NSN 5975-01-341-3247
NSN 5945-00-540-1052
NSN 5895-00-779-2736
NSN 6620-01-468-3826