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 6650-01-147-7135
NSN 4140-00-832-3286
NSN 6240-00-150-6754
NSN 5915-01-249-0106
NSN 6320-00-882-7061
NSN 6645-01-444-3016
NSN 5998-01-544-5532
NSN 5945-00-226-1610
NSN 5925-00-630-8178
NSN 5945-01-147-4932
NSN 5985-01-178-0064
NSN 5915-01-633-9845