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 4140-01-074-2588
NSN 5975-01-326-0268
NSN 6130-01-445-3613
NSN 5915-01-358-0164
NSN 5975-01-626-9900
NSN 6130-01-512-9572
NSN 5835-00-518-2740
NSN 5960-00-752-6175
NSN 6645-01-100-3296
NSN 6645-00-628-6515
NSN 5855-01-498-4949
NSN 6650-00-754-2276