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 4140-01-492-2784
NSN 5975-00-248-5590
NSN 6240-01-152-7046
NSN 6105-01-014-4669
NSN 5985-01-600-9950
NSN 6320-01-140-1763
NSN 6145-01-567-8789
NSN 2925-01-231-6312
NSN 7035-00-455-7666
NSN 6620-01-070-2215
NSN 5930-00-993-3244
NSN 6620-01-245-0184