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 6610-01-409-1781
NSN 6240-00-708-2083
NSN 4140-00-925-5188
NSN 6685-01-607-1192
NSN 6220-01-454-4022
NSN 5925-01-318-1082
NSN 6135-01-370-2599
NSN 6320-00-937-5625
NSN 5996-00-488-2273
NSN 6130-01-622-5377
NSN 5920-00-285-2245
NSN 6105-01-599-5240