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 6620-00-257-2783
NSN 5905-01-574-0359
NSN 6110-01-174-6249
NSN 6650-01-622-0706
NSN 5920-01-005-2023
NSN 6130-01-069-2514
NSN 5996-00-226-5364
NSN 5975-01-290-3717
NSN 6150-01-532-7534
NSN 5998-01-368-4012
NSN 6240-01-591-2467
NSN 6110-00-133-2429