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 6105-01-274-5951
NSN 5998-01-591-7600
NSN 6220-00-841-1275
NSN 5915-00-102-7864
NSN 5835-01-106-1456
NSN 5835-01-132-5894
NSN 5996-01-382-9710
NSN 6610-00-186-9180
NSN 6240-01-443-0519
NSN 5985-01-231-9759
NSN 5985-00-106-6146
NSN 5835-00-594-4921