What is a Hanger Screw?
You may have wondered how table and chair legs magically stay attached to the table, usually with no visible signs of hardware. In reality, it’s not magic at all that keeps them in place, but rather a simple device called a hanger screw, or sometimes a hanger bolt. A hanger screw is a screw with no head. It is designed to be driven into wood or other soft material. There are wood screw threads on one end, which is pointed, and machine threads on the other. The two threads may meet in the middle, or there may be an non-threaded shaft in the center. Hanger screws come in various sizes of threads, for example, 1/4 inch (.64 cm) or 5/16 inch (.79 cm). The thread length may vary from between 1-1/2 inches (3.8 cm) to 3 inches (7.6 cm). Installation generally requires the use of a special wrench. The type hanger screw you’ll need will depend on the application. Table and chair legs, for example, must be attached firmly to the table, and would require a fully threaded screw, so there is no gap
