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 6650-00-547-4557
NSN 5996-01-179-8130
NSN 4140-01-418-8717
NSN 5996-01-371-2958
NSN 5925-00-175-9349
NSN 5998-01-657-7942
NSN 6150-01-416-1234
NSN 5998-00-572-9182
NSN 6610-00-301-6365
NSN 5996-01-440-9660
NSN 5996-01-358-7886
NSN 7035-01-429-7954