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 6645-00-175-8156
NSN 6650-00-071-3102
NSN 5915-01-629-5322
NSN 5895-01-351-2191
NSN 6650-00-113-4102
NSN 6320-01-255-2096
NSN 5855-01-060-8521
NSN 6645-00-880-8045
NSN 6110-00-988-0920
NSN 6150-01-552-6160
NSN 5895-01-526-3837
NSN 5855-01-054-9014