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 5990-01-221-6361
NSN 6610-01-349-6333
NSN 5935-01-153-2662
NSN 6130-01-111-3205
NSN 6135-01-486-7973
NSN 5965-00-689-1545
NSN 5855-00-198-3197
NSN 2925-01-545-2717
NSN 5930-01-102-5340
NSN 5965-01-547-2587
NSN 5925-01-236-6722
NSN 5945-00-678-2859