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 6150-01-158-9433
NSN 4140-01-388-7707
NSN 5999-01-531-6468
NSN 5915-01-608-2495
NSN 5975-01-526-5656
NSN 7035-00-703-3535
NSN 5999-00-018-6718
NSN 5835-01-081-9345
NSN 5915-00-398-0675
NSN 6150-00-456-0421
NSN 6610-01-425-1523
NSN 4140-01-054-2279