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 6610-01-388-0563
NSN 5910-01-077-8368
NSN 6620-00-075-6667
NSN 5960-00-116-1115
NSN 5905-00-326-4829
NSN 5895-01-225-5094
NSN 5975-01-231-9669
NSN 5915-01-328-7525
NSN 5935-01-590-7503
NSN 5925-00-396-2412
NSN 5998-01-155-1664
NSN 5999-01-480-0426