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 5990-01-443-2931
NSN 4140-01-409-1764
NSN 5985-00-364-7835
NSN 6110-01-122-5916
NSN 6320-01-459-6992
NSN 5935-01-392-1115
NSN 5935-00-843-4680
NSN 6135-01-610-7335
NSN 6135-00-175-1268
NSN 5835-01-658-8290
NSN 5960-00-243-9155
NSN 6135-00-196-5267