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 6110-00-578-7243
NSN 6650-00-379-5434
NSN 6610-00-224-4252
NSN 5998-01-660-6726
NSN 4140-01-603-3104
NSN 2925-00-233-5644
NSN 5999-01-327-2916
NSN 5910-01-223-8026
NSN 5960-00-854-7171
NSN 2925-01-311-7840
NSN 6610-01-522-5357
NSN 6240-01-476-7935