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 5920-00-614-9281
NSN 5920-01-043-4848
NSN 5999-00-229-6602
NSN 5935-01-126-7192
NSN 6320-01-551-3553
NSN 5895-01-198-2228
NSN 5925-00-171-0307
NSN 6620-01-322-8382
NSN 6320-01-388-9450
NSN 6620-00-280-2874
NSN 6135-01-557-9656
NSN 6135-01-052-9634