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 5920-01-305-0721
NSN 6645-01-537-3114
NSN 5998-01-064-3938
NSN 5855-01-129-1327
NSN 4140-01-629-4684
NSN 6240-01-189-6955
NSN 6110-01-172-0451
NSN 6150-00-244-1964
NSN 6645-01-464-4937
NSN 5855-01-247-0012
NSN 5935-00-186-8025
NSN 6320-01-607-1491