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 5925-01-523-4838
NSN 5960-01-055-6675
NSN 5996-01-467-9391
NSN 7035-00-402-4971
NSN 5935-01-643-5493
NSN 5910-01-109-1864
NSN 6150-00-100-4757
NSN 5920-00-028-4339
NSN 5920-01-442-3395
NSN 5930-01-587-9122
NSN 6240-01-212-3529
NSN 5965-00-583-4865