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 6240-00-499-3276
NSN 5960-00-880-0457
NSN 6685-01-411-5749
NSN 6650-01-154-1870
NSN 5935-01-315-5178
NSN 5905-01-175-0310
NSN 6130-01-327-8788
NSN 6220-01-176-3686
NSN 6320-01-296-3181
NSN 6105-00-998-8227
NSN 5950-01-463-9075
NSN 5835-00-122-6476