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 6620-00-420-1061
NSN 6135-00-097-8162
NSN 6220-01-539-0923
NSN 5950-01-249-0987
NSN 5920-00-911-3452
NSN 5930-00-518-1642
NSN 5996-01-472-2858
NSN 5998-01-517-9959
NSN 6620-01-597-7200
NSN 5920-01-521-4262
NSN 5950-00-724-5642
NSN 5960-00-096-7140