A shoulder screw is a type of mechanical fastener for applications that require an unthreaded shaft to guide, space, or rotate parts. It consists of three main sections, including: Head: It provides a driving interface, usually hex or socket head, for tight fitting. Shoulder: The cylindrical portion without threads allows for precise alignment and smooth movement between the components. https://www.dalloyedbolts.com/shoulder-screw-manufacturers-suppliers-stockists-exporters.html