Which fastener is used on concrete?

• A. Expansion anchor bolt
• B. Toggle bolt
• C. Sleeve anchor
• D. Concrete screw

Answer: (A)

When fastening into concrete, you want a method that actually grips the solid material rather than just threading into it. An expansion anchor bolt does this by being set into a predrilled hole and then tightened. As the bolt is tightened, a sleeve or wedge inside the anchor expands against the hole walls, creating a secure mechanical grip in the concrete. This makes it a reliable choice for anchoring heavy loads in concrete or masonry.

A toggle bolt won’t work well in solid concrete because it relies on wings that open behind a hollow cavity, which isn’t present in solid material. A sleeve anchor also works in concrete and can be effective, but the expansion anchor bolt is the classic, straightforward option for solid concrete and is widely used for strong, permanent anchors. Concrete screws can be used too, but they depend on threads cut into the concrete and are chosen for different scenarios.