Set screw

A set screw is a type of screw generally used to secure an object within or against another object. The most common examples are securing a pulley or gear to a shaft. Set screws are usually headless, meaning that the screw is fully threaded and has no head projecting past the major diameter of the screw thread. A blind set screw is almost always driven with an internal-wrenching drive, such as a hex socket, star, square socket, or slot. The set screw passes through a threaded hole in the outer object and is tightened against the inner object to prevent it from moving relative to the outer object. It exerts compressional or clamping force through the bottom tip that projects through the hole. An example application is when a set screw is screwed into a pulley hub so that its end-point bears firmly against the shaft. The fastening action is by friction between the screw and the shaft, often with some amount of elastic or plastic deformation of one or both. This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video

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