The Simpson Strong-Tie SDWS221000DB-R50 Strong-Drive SDWS TIMBER Screw (Exterior Grade) is a 10-inch structural wood screw built for heavy wood-to-wood fastening in exterior projects. This is a structural wood screw designed for fastening wood-to-wood connections in exterior applications. Model Number: SDWS221000DB-R50. If you are building ledgers, posts, beams, pergolas, fences, or other structural connections and want a faster alternative to through-bolting or old-school lag screws, this is the kind of fastener you reach for.

What matters most on the job is how a screw starts, how it drives, and how well it holds. Simpson uses a SawTooth point here, which helps the screw start fast, cuts down installation torque, and eliminates predrilling in most applications. The bold thread design is there for holding power, not marketing copy. It helps the screw pull tight and stay locked in wood members where a weak or shallow thread would give up ground.

The head and drive setup are also well thought out. This version uses a large washer head with a 0.760-inch diameter, so you get a broad bearing surface that helps clamp material without needing a separate washer. Underhead nibs help the head seat flush with less splintering at the surface, which matters when you want a clean finished look on exposed framing or outdoor structures. The 6-lobe T40 drive gives positive engagement, so the bit stays planted better under load and you spend less time fighting stripped recesses.

For this specific variant, the screw is 10 inches long with a 0.220-inch shank diameter and a 3-inch thread length. That combination makes it useful where you need long reach through thick assemblies while still getting the grip and pull of a structural screw. The tan double-barrier coating is meant for exterior use and for certain preservative-treated wood applications. In plain terms, this is the better fit when standard interior fasteners are not enough and you need a screw that can live outside.

Simpson positions the Strong-Drive SDWS TIMBER screw for structural wood-to-wood and engineered wood applications, including ledgers and mass timber connections such as wall-to-wall, floor-to-floor, surface splines, and lap joints. That tells you this is not just a landscaping screw or a deck trim fastener. It is meant for real structural fastening where code-listed hardware and predictable performance matter.

Who should buy it? Contractors, framers, deck builders, remodelers, and serious DIY users working on exterior structures. If you need a 10-inch exterior structural screw in a 50-count pack and want easier installation than traditional lag screws, the Simpson Strong-Tie SDWS221000DB-R50 lands in the sweet spot. It is especially useful when speed matters, access is tight, and you still need a strong mechanical connection in wood.

Why the Simpson Strong-Tie SDWS221000DB-R50 Strong-Drive SDWS TIMBER Screw earns its spot

This is the screw you grab when a basic wood screw is not enough and a lag screw feels slow and old-fashioned.

• Who it's for: Pros and serious DIY builders doing exterior wood-to-wood structural work like ledgers, pergolas, fencing, and heavy framing repairs.
• Why it stands out: The combo of a fast-start SawTooth point, big washer head, and positive 6-lobe T40 drive makes installation easier without giving up the strength you expect from a structural timber screw.
• Worth knowing: This pack gives you 50 tan 10-inch screws. Make sure you have a T40 bit on hand, and if you are matching hardware to darker finishes, Simpson also offers black versions in the broader SDWS line.

• Is this an exterior screw? Yes. This SDWS TIMBER screw uses a double-barrier coating intended for certain exterior and preservative-treated wood applications.
• Does it usually require predrilling? In most applications, no. The SawTooth point is designed for fast starts and reduced installation torque, which eliminates predrilling in most cases.
• What drive size does it use? It uses a 6-lobe T40 drive.
• What kind of connections is it meant for? It is designed for wood-to-wood and engineered wood fastening, including ledgers and certain mass timber connections.