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 6610-01-189-3001
NSN 6645-01-023-0005
NSN 6135-01-370-2599
NSN 6240-01-199-7653
NSN 6110-01-371-3049
NSN 6105-00-405-2343
NSN 6150-00-005-1791
NSN 5996-01-389-4067
NSN 5996-01-592-3011
NSN 5950-00-051-4532
NSN 5905-00-594-0302
NSN 5945-01-641-2789