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 5965-01-168-8180
NSN 5945-01-526-5830
NSN 5999-01-450-4892
NSN 6610-01-438-8246
NSN 5965-00-764-1841
NSN 5910-00-925-6200
NSN 6150-01-545-6897
NSN 5965-01-571-5678
NSN 6150-01-322-7075
NSN 6685-01-241-2325
NSN 6620-01-364-0195
NSN 5915-01-191-5334