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 6320-00-024-1004
NSN 6110-00-334-3361
NSN 6650-01-348-2407
NSN 6130-01-200-3600
NSN 6620-01-352-5640
NSN 5835-01-229-6964
NSN 6145-01-481-1539
NSN 6110-01-632-6148
NSN 5975-01-437-8869
NSN 6620-01-107-2965
NSN 4140-00-006-7710
NSN 5985-00-244-1378