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 6135-00-269-5843
NSN 5965-01-422-9770
NSN 4140-00-422-5571
NSN 6130-01-556-9061
NSN 5925-01-141-6688
NSN 5990-01-309-3740
NSN 6105-01-301-0741
NSN 6650-00-299-1839
NSN 6130-01-227-5538
NSN 5915-01-338-3556
NSN 5945-01-254-3773
NSN 6610-01-283-2341