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 4140-01-547-5589
NSN 6130-00-627-2521
NSN 6110-01-487-3916
NSN 5895-01-485-1618
NSN 5915-00-161-4409
NSN 6610-01-629-4140
NSN 6220-00-852-0367
NSN 5935-01-318-1115
NSN 6150-01-322-4269
NSN 5915-01-510-2296
NSN 6645-01-416-6979
NSN 6130-01-262-0693