Expandable anchors, often known as expansion anchors, are fasteners designed to secure objects to solid materials such as concrete, brick, or stone. The fundamental principle behind their design is the ability to expand under pressure, thereby creating a secure grip within the base material. When installed, the anchor's body expands outward, locking itself firmly in place, making it suitable for heavy loads and dynamic forces.

The advantages of using hex head bolts are numerous. First and foremost, their design allows for easy installation and removal. The hexagonal shape minimizes the likelihood of slipping, making it easier for mechanics and engineers to apply the necessary torque. Furthermore, hex head bolts can be used with a variety of tools, including wrenches and ratchets, enhancing their versatility.