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 6110-01-057-3474
NSN 6220-00-057-2236
NSN 5895-00-135-3767
NSN 2925-00-491-3549
NSN 6220-01-527-9010
NSN 6320-00-082-5868
NSN 6135-00-044-3860
NSN 5999-01-094-6563
NSN 5985-01-378-5835
NSN 5835-01-301-0022
NSN 6610-01-633-8931
NSN 5975-00-221-7175