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 6135-01-449-2144
NSN 5990-01-471-7858
NSN 5915-01-157-9579
NSN 5990-00-924-4167
NSN 5975-00-127-9989
NSN 5985-01-578-6310
NSN 6150-00-631-6641
NSN 6220-01-175-9052
NSN 2925-01-314-5833
NSN 4140-01-104-9279
NSN 5999-00-936-3776
NSN 5920-01-017-3233