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 6105-00-683-1000
NSN 5975-01-313-1880
NSN 6105-00-035-8809
NSN 6320-01-212-8749
NSN 6645-00-842-4653
NSN 5945-01-624-2924
NSN 5910-01-197-8498
NSN 5835-01-108-4980
NSN 6240-01-159-8314
NSN 6320-01-652-3806
NSN 5996-01-248-7293
NSN 5915-01-371-6480