Which type of anchor requires a drilled hole in the floor for installation?

Expansion anchors are designed specifically to be installed in drilled holes in materials such as concrete, masonry, or stone. The installation process begins with creating a hole of the appropriate diameter and depth, into which the anchor is inserted. Once installed, the anchor expands as a bolt or screw is tightened, creating a secure, load-bearing connection that holds fast against pulling forces.

This method of installation is crucial when working with rigid materials, as it provides significant holding power by distributing the load across the anchor and the surrounding material. This makes expansion anchors ideal for heavier loads or applications where strength and safety are paramount.

In contrast, toggle anchors function differently, as they rely on a spring-loaded mechanism that secures them to a wall's inner cavity without requiring a drilled hole. Adhesive anchors, conversely, utilize a bonding agent to secure the anchor within a hole, while concrete screws are designed to tap into pre-drilled holes and do not need additional expansion. Thus, it is the unique requirement of a drilled hole for installation that distinctly identifies expansion anchors from the others listed.