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 5998-01-388-4555
NSN 5935-01-340-1844
NSN 6685-01-445-6201
NSN 6150-00-989-2169
NSN 5920-01-346-4525
NSN 5996-01-610-6641
NSN 6620-01-481-1358
NSN 6650-01-573-0616
NSN 2925-01-515-3032
NSN 5910-00-833-8298
NSN 5895-00-585-0039
NSN 5935-00-616-2809