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 5915-01-345-4846
NSN 6620-01-169-9470
NSN 5965-01-209-2838
NSN 6685-00-007-1404
NSN 5905-01-453-0679
NSN 6150-00-692-7043
NSN 2925-00-471-1128
NSN 6650-00-423-2178
NSN 5990-00-785-1876
NSN 6620-01-364-0195
NSN 5895-00-450-8368
NSN 5975-01-184-2736