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 6610-01-315-7002
NSN 6150-00-317-5498
NSN 2925-01-327-3069
NSN 4140-01-246-3090
NSN 6650-01-294-5243
NSN 5935-00-438-9561
NSN 6135-00-557-8874
NSN 5930-01-256-2337
NSN 6110-01-167-8906
NSN 5930-01-459-7884
NSN 5996-00-500-7328
NSN 5835-00-148-9719