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 6110-00-976-3361
NSN 6220-01-342-3887
NSN 6150-01-579-3177
NSN 6650-01-473-6717
NSN 5950-01-540-3561
NSN 5998-01-384-3789
NSN 5905-00-905-5813
NSN 5835-00-710-7537
NSN 5975-01-547-7230
NSN 5835-01-642-4705
NSN 5945-01-307-4456
NSN 5990-01-100-1840