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 6620-00-151-5363
NSN 6150-01-195-0993
NSN 5975-00-202-2367
NSN 5950-00-069-6895
NSN 5999-01-245-8500
NSN 5965-01-125-3830
NSN 6240-00-933-7641
NSN 5915-00-890-0929
NSN 6130-01-264-5190
NSN 5998-01-473-7931
NSN 6110-01-065-0232
NSN 5998-00-371-4424