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 5990-00-488-1091
NSN 6645-01-399-0661
NSN 6240-01-277-3762
NSN 5930-01-560-4669
NSN 6650-00-400-8371
NSN 5925-01-254-4781
NSN 6645-00-107-2148
NSN 5996-01-523-3834
NSN 5855-01-147-1509
NSN 6320-01-643-0850
NSN 5945-01-234-4487
NSN 6150-01-334-4147