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 5990-01-268-6767
NSN 5945-01-518-6778
NSN 5935-01-351-2893
NSN 5975-01-495-1343
NSN 6220-01-011-0865
NSN 6645-00-025-4771
NSN 5930-00-274-7167
NSN 6150-01-218-1767
NSN 5965-00-055-8013
NSN 6320-01-512-2031
NSN 6240-01-166-1807
NSN 5985-00-101-0698