To fasten one object within or against another, socket and set screws are utilized. Shoulder screws, often referred to as shoulder bolts or stripper bolts, are commonly employed in pulleys, linkages, and other moving elements. They can also be used as precision spacers or guide screws. Machine construction, as well as engine and machine maintenance, require socket head cap screws. For a variety of engineering, manufacturing, and automobile applications, headless socket set screws are utilized with pulleys or similar machine parts in a shaft.