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 4140-01-049-3977
NSN 4140-01-290-5230
NSN 5895-00-455-0248
NSN 5960-00-866-9660
NSN 5925-00-081-9135
NSN 5935-01-335-4660
NSN 5895-00-406-1603
NSN 6220-00-138-5969
NSN 5910-01-145-4297
NSN 5998-01-421-3179
NSN 6130-00-247-8871
NSN 6610-01-566-8198