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 6685-00-901-7219
NSN 5915-01-608-5264
NSN 5945-01-659-2175
NSN 5930-01-513-9261
NSN 5915-01-237-4645
NSN 5895-00-955-5569
NSN 6610-00-176-5486
NSN 6105-01-152-7605
NSN 5905-01-029-3665
NSN 5905-00-491-3933
NSN 5960-00-567-2380
NSN 6685-01-198-0875