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 6650-01-137-3278
NSN 5910-00-328-8916
NSN 5975-01-099-6418
NSN 5910-01-303-8113
NSN 4140-01-273-3962
NSN 6645-01-645-9117
NSN 5925-00-583-8922
NSN 6145-00-427-7201
NSN 5960-00-441-5147
NSN 6110-00-999-1592
NSN 5930-00-291-5400
NSN 5925-01-395-6479