Socket head cap screws are a type of fastener characterized by a cylindrical head with a hexagonal recess (or socket) that allows for tightening or loosening using an Allen wrench or hex key. They are typically made of high-strength materials such as alloy steel, stainless steel, or other metals, and are used in applications requiring a strong, flush, or low-profile fastening solution.

These screws are commonly employed in machinery, automotive, and industrial equipment where precise torque and secure fastening are essential.