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 6650-01-241-7978
NSN 5985-01-082-6679
NSN 5935-01-099-6562
NSN 5930-01-487-4842
NSN 5855-01-020-7982
NSN 4140-01-457-5539
NSN 5935-01-400-1996
NSN 5998-00-890-2586
NSN 5999-01-275-5836
NSN 5920-01-066-3117
NSN 6645-00-833-2395
NSN 6320-00-725-0754