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 6610-01-633-8931
NSN 6220-01-344-7616
NSN 5910-01-441-9397
NSN 6320-00-725-0754
NSN 5985-00-584-3795
NSN 5895-00-938-3541
NSN 5935-00-597-5055
NSN 5996-01-273-3934
NSN 5895-01-227-2157
NSN 6150-01-645-7321
NSN 5998-00-102-7926
NSN 5930-01-042-7881