Hillman 5/16-in Zinc-plated Hex-head Lag Screw

5/16-in Zinc-Plated Hex-Head Lag Screw Hex lag screws, also called lag bolts, are used in wood construction The threads on lag bolts are designed to embed into the wood, rather than relying on a nut to secure the connection Coarse threads requiring a pre-drilled hole with minimal clearance above the fastener Hex drive for controlled traction with a socket or wrench.