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 5990-00-314-3522
NSN 5999-01-513-8019
NSN 5965-00-387-6880
NSN 5855-01-373-7538
NSN 2925-01-279-6692
NSN 6320-00-681-1324
NSN 5910-01-213-1848
NSN 5996-01-421-9391
NSN 5985-00-401-7230
NSN 5920-01-350-3163
NSN 5950-01-236-2503
NSN 5999-01-195-5712