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 6685-01-020-6718
NSN 6135-01-300-8455
NSN 5855-00-466-2309
NSN 5950-00-692-3126
NSN 5835-01-424-4577
NSN 5920-01-206-0191
NSN 2925-01-132-5827
NSN 5990-01-440-7135
NSN 5920-01-631-4009
NSN 5855-00-014-5008
NSN 6650-00-239-9226
NSN 5835-01-141-8823