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 5935-01-077-1970
NSN 5996-01-398-1632
NSN 5905-01-165-6611
NSN 5945-01-149-4291
NSN 6150-00-148-8515
NSN 5920-01-529-6313
NSN 6685-00-500-6933
NSN 6320-01-558-2141
NSN 5855-00-408-2611
NSN 5998-01-287-5129
NSN 5905-00-429-5671
NSN 6240-00-567-4795