Which of the following is a screw-type anchor?

• A. Cross-plate
• B. Deadman
• C. Expansion
• D. Screw

Answer: (B)

The main idea here is how the anchor grabs the substrate to resist pulling forces. A screw-type anchor gains its grip by a threaded or helical element that cuts into and locks with the surrounding material as it’s installed, creating a reliable mechanical bite and friction along the length of the embedded portion.

In this context, the Deadman is the screw-type anchor because it relies on a buried member (like timber, pipe, or plate) connected to the load. As pull is applied, the load transfers into that buried piece and the surrounding soil provides resistance along the length of the embedded member, functioning much like a screw that is worked into the ground and secured by friction and soil shear. This makes it behave like a screw-type anchor in terms of how it develops resistance to movement.

The other options work differently: expansion anchors rely on a sleeve or wedge that expands behind the substrate when loaded, and cross-plate isn’t a screw-type device. A direct “screw” anchor would be a fastener that uses threads to grip as it’s driven in, but in this context the Deadman is classified as the screw-type option.