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 6150-00-278-7070
NSN 5975-01-384-1999
NSN 5935-01-448-5238
NSN 6220-01-192-3451
NSN 5835-00-928-5717
NSN 4140-00-311-6329
NSN 5998-01-517-6930
NSN 6620-00-443-4694
NSN 5960-01-467-7516
NSN 5985-01-384-3317
NSN 5990-00-761-9160
NSN 5960-01-458-0774