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 4140-01-089-9724
NSN 6145-01-027-9030
NSN 5930-01-308-0017
NSN 5975-01-474-6534
NSN 6110-01-560-4352
NSN 6145-01-478-1722
NSN 6110-00-404-1790
NSN 5985-01-509-3004
NSN 5925-00-130-2586
NSN 6220-00-396-0039
NSN 5990-01-334-8634
NSN 5965-01-051-3727