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 6610-01-174-1622
NSN 6650-01-123-0111
NSN 6150-01-479-8575
NSN 5999-00-487-7926
NSN 5975-01-085-4892
NSN 6110-01-427-0161
NSN 6240-01-452-9418
NSN 6135-01-074-8220
NSN 5960-01-449-1310
NSN 5960-00-579-0298
NSN 6240-01-139-1066
NSN 5935-01-185-2373