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 6240-01-137-1279
NSN 5920-01-518-5020
NSN 6620-00-920-1671
NSN 5998-01-034-0876
NSN 5835-00-813-1724
NSN 5999-01-463-3026
NSN 6105-01-374-0347
NSN 5925-01-624-4903
NSN 5985-01-574-2870
NSN 5910-01-349-3058
NSN 5910-00-647-4059
NSN 4140-01-084-0949