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 2925-00-142-9919
NSN 2925-00-706-5902
NSN 6610-00-419-0315
NSN 6130-00-551-8316
NSN 5975-00-037-8680
NSN 5895-01-274-6625
NSN 6320-01-252-2307
NSN 5930-01-627-9741
NSN 5855-00-466-2309
NSN 6135-00-062-5080
NSN 5930-01-437-5891
NSN 4140-00-270-8075