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 6110-01-552-6442
NSN 6620-01-619-2978
NSN 5998-01-508-9581
NSN 6620-00-392-9835
NSN 5999-01-394-6736
NSN 5996-01-377-3743
NSN 5905-00-369-1644
NSN 6610-01-141-7014
NSN 6220-00-141-6150
NSN 5996-01-364-7934
NSN 5998-01-557-1500
NSN 7035-01-627-6614