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 6645-01-297-5639
NSN 6610-00-469-8534
NSN 6650-00-754-2276
NSN 6105-01-505-1830
NSN 5965-01-571-7958
NSN 5965-01-441-9850
NSN 6150-00-925-2465
NSN 5975-01-367-7565
NSN 5910-01-398-5136
NSN 5975-00-997-8661
NSN 5920-01-590-3576
NSN 6240-01-268-2223