Which fastener has a square or hex head and is designed to be turned with a wrench?

Which fastener has a square or hex head and is designed to be turned with a wrench?

• A. Stove bolt
• B. Lag
• C. Lead anchors
• D. Drop-in

Answer: (B)

A fastener designed to be turned with a wrench and featuring a square or hex head is a lag screw (lag bolt). The distinctive head shape is built to fit a wrench or socket, letting you apply a lot of torque to drive it deep into wood and create a very strong hold. Lag screws are heavy‑duty wood fasteners with coarse threads that bite into timber, typically used to secure heavy structural members or connect thick framing. You’ll usually drill a pilot hole first to prevent splitting and to let the screw bite cleanly. The other options serve different purposes and aren’t driven by turning a square or hex head with a wrench in the same way. Lead anchors and drop‑in anchors are types of masonry anchors installed into holes in concrete or brick; the anchor body is not what you turn with a wrench—it's the screw driven into the anchor. Stove bolts vary in head type but are generally smaller machine screws used for lighter or metal connections, not the heavy‑duty wood fastening that lag screws provide.

A fastener designed to be turned with a wrench and featuring a square or hex head is a lag screw (lag bolt). The distinctive head shape is built to fit a wrench or socket, letting you apply a lot of torque to drive it deep into wood and create a very strong hold. Lag screws are heavy‑duty wood fasteners with coarse threads that bite into timber, typically used to secure heavy structural members or connect thick framing. You’ll usually drill a pilot hole first to prevent splitting and to let the screw bite cleanly.

The other options serve different purposes and aren’t driven by turning a square or hex head with a wrench in the same way. Lead anchors and drop‑in anchors are types of masonry anchors installed into holes in concrete or brick; the anchor body is not what you turn with a wrench—it's the screw driven into the anchor. Stove bolts vary in head type but are generally smaller machine screws used for lighter or metal connections, not the heavy‑duty wood fastening that lag screws provide.