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 6220-01-654-5210
NSN 5915-01-097-0459
NSN 5990-00-064-7839
NSN 5935-01-418-0935
NSN 6130-01-317-4239
NSN 5835-00-794-7500
NSN 5998-01-538-9129
NSN 6610-01-322-7677
NSN 5990-00-130-1930
NSN 5996-01-517-2328
NSN 5925-01-081-0436
NSN 5910-01-542-1970