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 6240-01-548-2197
NSN 5998-01-262-0103
NSN 5950-00-984-2536
NSN 5950-00-144-4139
NSN 6150-01-018-8126
NSN 5920-01-214-8430
NSN 5990-01-043-3400
NSN 5930-00-971-6950
NSN 6110-01-274-7774
NSN 6110-01-416-9129
NSN 5835-01-345-6697
NSN 5835-01-654-4570