An expansion shield or expansion anchor is used for very heavy materials needed to be anchored into concrete, brick, or block. They are commonly used when the installation calls for shear load or the bolt will be exposed to vibration and side pressure.

There are different types of an expansion shield, namely, single expansion, double expansion, and lag screw expansion.

Structural members which need anchors to be attached to masonry involves ledger beam, girders, floor and roof diaphragms, and other materials that might need to transfer their load to the masonry. Not only do anchors transfer gravity loads to masonry but they also can transfer lateral loads as well.

There are a variety of applications possible for construction anchors. Typically, they are used to secure objects to materials that are normally resistant to screw or nails, for example, concrete. There are a lot of different types of anchors to choose from depending on your needs.