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 6320-01-512-2031
NSN 6240-01-538-5525
NSN 5996-01-508-6801
NSN 6145-00-996-8879
NSN 6150-01-242-9239
NSN 5930-01-228-8724
NSN 6610-01-461-8180
NSN 4140-00-390-2373
NSN 6610-01-644-2546
NSN 6105-00-954-0757
NSN 5905-01-481-6999
NSN 5960-01-206-0743