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 5998-01-626-6429
NSN 6610-01-535-0310
NSN 6150-01-325-8921
NSN 6620-00-355-1734
NSN 5998-01-381-2536
NSN 5930-01-380-6106
NSN 2925-01-197-7864
NSN 5965-00-064-5435
NSN 6220-00-734-8874
NSN 5920-00-250-8290
NSN 5895-01-599-2833
NSN 6135-01-309-2299