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 6320-01-392-3531
NSN 5960-01-462-6267
NSN 5965-01-602-0471
NSN 5990-00-226-7894
NSN 6150-00-309-5215
NSN 5996-01-018-9708
NSN 5895-00-873-0677
NSN 5975-01-107-7509
NSN 6135-00-267-9432
NSN 4140-01-046-0119
NSN 6650-01-141-4817
NSN 6150-00-019-9633