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 6610-01-606-8788
NSN 6135-01-386-5709
NSN 6685-01-467-4166
NSN 6105-01-290-2068
NSN 5990-01-407-6615
NSN 6650-01-251-0584
NSN 6645-01-413-3506
NSN 4140-01-391-6462
NSN 5915-00-413-0675
NSN 5999-01-627-2686
NSN 5998-00-583-3159
NSN 6240-00-594-7138