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 6220-01-522-2729
NSN 6110-01-245-8507
NSN 5920-01-206-3977
NSN 5895-01-523-1379
NSN 6145-00-064-8612
NSN 6135-01-370-2599
NSN 5935-01-386-4651
NSN 5985-01-294-4721
NSN 6130-01-384-3977
NSN 6105-01-634-0322
NSN 5985-01-468-5674
NSN 6220-00-272-7497