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 6220-00-531-6430
NSN 5999-01-406-5216
NSN 6105-01-256-2588
NSN 5915-01-439-2249
NSN 6145-01-519-8210
NSN 6650-01-392-0588
NSN 5990-00-840-6571
NSN 6150-01-399-7564
NSN 5965-01-099-2989
NSN 5915-00-194-4876
NSN 6610-00-684-1666
NSN 5935-01-054-3556