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 5910-01-507-5641
NSN 5905-01-065-0696
NSN 5925-01-503-6177
NSN 5835-01-105-6170
NSN 6620-01-296-0871
NSN 5935-00-128-1588
NSN 6685-01-518-8908
NSN 6685-01-091-3094
NSN 5935-01-582-5835
NSN 5998-01-439-0537
NSN 5999-01-628-2798
NSN 6130-01-548-1030