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 6240-00-879-0771
NSN 6620-01-510-3501
NSN 6685-01-248-0946
NSN 5996-01-388-1275
NSN 5945-01-603-0361
NSN 5935-00-916-3860
NSN 5945-00-370-9477
NSN 5950-00-278-1201
NSN 5960-01-364-1318
NSN 7035-01-258-7661
NSN 6145-01-571-2565
NSN 5925-00-704-4491