Hanger bolts are threaded on both ends. They have a lag screw thread on one end and a machine screw thread on the other. These fasteners are great for installing sheet metal overhead, attaching fixtures to the ceiling, and electrical wiring. Hanger bolts are best suited for installing in a pre-drilled hole and cannot be used with a standard screwdriver. If you have any questions or comments, please use the "Contact Us" link at the top of the page.