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 6620-01-386-5914
NSN 5920-00-406-2712
NSN 6240-01-625-1279
NSN 5930-00-589-5269
NSN 6620-00-643-1402
NSN 6645-01-209-0264
NSN 6650-01-462-9709
NSN 6135-01-421-3189
NSN 5950-01-335-6578
NSN 5950-00-133-8953
NSN 5945-01-352-5852
NSN 5895-01-508-8310