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 6320-00-270-8222
NSN 6320-01-240-4637
NSN 6135-00-271-0407
NSN 5935-00-137-8901
NSN 6130-01-634-0603
NSN 5985-01-294-5468
NSN 6105-01-063-7704
NSN 6240-01-213-4905
NSN 5920-01-123-9854
NSN 5920-00-149-1469
NSN 5985-01-390-6297
NSN 5996-00-900-5251