Simpson Strong-Tie® Strong-Drive® SDWH Timber-Hex HDG Screw is a heavy-duty structural fastener made for tough outdoor jobs, especially in coastal and marine settings. With its hot-dip galvanized coating, it’s built to stand up to harsh weather and moisture. The SawTooth® point starts fast and usually doesn’t need predrilling, helping you save time on big timber projects. Plus, the large built-in washer head spreads the load, so you don’t need to mess with a separate washer. Great for replacing bulky bolts, spikes, or lag screws, this screw gives you strength and speed in one simple step.

Key Features

• Built for big jobs – 0.276" diameter shank for heavy-duty timber connections.
• Marine-ready protection – ASTM A153 hot-dip galvanized finish resists corrosion in coastal and wet environments.
• Fast, easy starts – SawTooth® point reduces driving torque and typically eliminates predrilling.
• No extra parts needed – Oversized 0.93" washer head eliminates the need for separate washers.
• Quick installation – 3/8" hex drive keeps the bit secure and makes driving easy.