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 5935-01-609-7178
NSN 5999-01-305-1835
NSN 6620-01-036-6687
NSN 6110-00-229-1360
NSN 6645-01-143-7838
NSN 5999-00-276-9299
NSN 5965-01-568-0102
NSN 6110-00-998-8474
NSN 5998-01-055-1759
NSN 6105-00-226-0211
NSN 6240-01-542-9964
NSN 2925-00-644-0028