Button Head Cap Screw is a type of fastener that is commonly used in machinery and assembly applications. This screw has a rounded head with a flat top surface and a cylindrical shape that tapers down towards the threaded shaft. The threaded portion of the screw is designed to mate with a threaded hole or nut, allowing for a secure connection. Moreover, the button head design of the screw provides a larger surface area for a wrench or screwdriver to grip, making it easier to tighten or loosen.