A head screw is a type of fastener that is commonly used in various applications. It is a threaded rod with a head on one end and a pointed tip on the other. The head of the screw is used to tighten or loosen the screw. There are various synonyms for the term head screw such as bolt, nut, stud, cap screw, socket head cap screw, hex head cap screw, machine screw, anchor screw, self-drilling screw, roofing screw, wood screw, drywall screw, and lag screw. Each type of screw has specific applications, sizes, and material requirements. It is essential to choose the appropriate type of screw for a specific task.