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 4140-01-487-2159
NSN 5960-00-485-0601
NSN 6150-01-068-4231
NSN 4140-01-300-1573
NSN 6620-00-626-2769
NSN 5996-01-204-5129
NSN 6220-01-455-5881
NSN 5999-01-065-2785
NSN 5910-01-228-4730
NSN 6620-01-521-0580
NSN 6130-00-258-2716
NSN 6620-01-078-6372