Nut, hex, heavy duty (requested name)
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 5915-01-412-5984
NSN 6685-01-300-2630
NSN 6610-01-469-6235
NSN 5990-01-069-5795
NSN 2925-01-159-0506
NSN 5960-00-083-2793
NSN 5935-00-419-2530
NSN 5895-00-943-3552
NSN 6645-01-416-9207
NSN 6150-01-064-0131
NSN 6320-00-646-3311
NSN 5835-00-054-4607