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 5990-01-476-8813
NSN 5855-01-556-7130
NSN 5965-01-425-2039
NSN 6150-01-260-2413
NSN 5990-01-623-0082
NSN 6110-00-359-5571
NSN 6220-01-525-0373
NSN 5915-01-633-9845
NSN 5999-00-196-3635
NSN 5975-01-339-7470
NSN 5915-01-349-2782
NSN 5999-00-421-6051