Key Features
Structural Wood Holding The bold thread design gives these timber screws the grip needed for structural wood-to-wood connections, so you can replace slower through-bolting or traditional lag bolt work in many applications. Fast Starts, Easy Drive The SawTooth point starts quickly and usually eliminates predrilling in wood, while the T40 6-lobe drive gives solid bit engagement so the screw drives with less fight. Exterior-Grade Protection The double-barrier coating is built for select exterior and preservative-treated wood applications, giving you corrosion resistance where ordinary interior screws are the wrong call.
Overview
The Simpson Strong-Tie SDWS22800DBMB Strong-Drive SDWS Timber Screws are exterior-grade structural wood screws built for heavy wood-to-wood fastening. This is a timber screw designed for structural wood-to-wood connections. Model Number: SDWS22800DBMB. With a 0.220 inch diameter, 8 inch length, washer head, and T40 6-lobe drive, this fastener is aimed at contractors, builders, and serious DIY users who need strong pull-through resistance, fast installation, and dependable performance in exterior or treated-wood work.
What matters most here is how the screw goes in and how it holds once it is there. The SawTooth point is made for fast starts and reduced installation torque, which helps the screw bite quickly into wood and cuts down on the need for predrilling in most applications. The bold thread pattern is there for holding power, especially in structural framing, ledgers, fencing, and mass timber connections. If you are trying to move faster than you would with traditional lag bolts, this design is the whole point.
The head design is just as important as the shank. Simpson uses a washer head to create a large bearing area, which helps distribute load better than a small conventional head in wood applications. Underhead nibs help the head seat flush with reduced splintering, so the finished connection is cleaner and the head drives down with less tearing at the surface. Size identification on the screw head is also a practical touch when you are sorting hardware on site.
The drive system is a T40 6-lobe interface, and that matters because a structural screw this size needs strong bit engagement. A better fit between bit and recess means less cam-out, better control, and better bit life when you are driving long fasteners repeatedly. Supplementary product data also notes that retail packaging includes a T40 driver bit, which is useful on the job when you want the right fit from the start.
For exterior work, the double-barrier coating is one of the main reasons to choose this fastener. Simpson positions it for corrosion resistance equivalent to hot-dip galvanization in steel screws and suitable for select exterior and preservative-treated wood applications. In real terms, that makes this a much better choice for outdoor assemblies and treated lumber than a standard interior wood screw that will not hold up.
Application-wise, this screw fits a wide range of structural fastening work. Known use cases include wood-to-wood ledger applications, mass timber connections such as cross-laminated timber wall-to-wall and floor-to-floor joints, plus lap joints and surface splines. That gives the Simpson Strong-Tie SDWS22800DBMB Strong-Drive SDWS Timber Screws a broader role than a basic deck screw or general-purpose wood fastener. It is a purpose-built structural fastening option for heavier connections.
If you are the buyer, the best fit is clear: builders, framers, fence contractors, remodelers, and anyone doing structural wood fastening who wants a long exterior wood screw with strong engagement and fewer steps during install. If the job calls for an 8 inch structural screw with exterior-grade protection, this one makes sense. If you only need a light-duty wood screw for trim or non-structural work, this is more fastener than you need.
Built to Move Structural Wood Fastening Faster
These screws are made for jobs where speed matters but the connection still has to be structural. Instead of slowing down with hardware that needs more prep, you get a fastener designed to start quickly and drive cleanly into heavy wood members.
- Designed for structural wood-to-wood connections
- Suitable for ledger applications, lap joints, and mass timber connections
Drive Engagement That Makes Long Screws More Manageable
On an 8 inch timber screw, the drive interface is not a small detail. The T40 6-lobe recess gives solid contact with the bit, which helps keep the driver engaged and makes repeated installation less frustrating.
- T40 6-lobe drive for positive engagement
- Washer head creates a large bearing area
Exterior-Grade Performance for Treated and Outdoor Wood
The coating is one of the big reasons to choose this screw. For exterior projects and select preservative-treated wood applications, the double-barrier coating gives the corrosion resistance needed for longer service life than an ordinary interior fastener.
- Double-barrier coated exterior-grade steel screw
- Tan finish blends better with many treated wood applications
What’s in the Box
- (250) Simpson Strong-Tie SDWS22800DBMB Strong-Drive SDWS Timber Screws, 0.220 in. x 8 in.
Key Specifications
| Fastener Type | Timber screw / hand-drive screw |
|---|---|
| Application | Structural wood-to-wood fastening |
| Length | 8 in. |
| Diameter | 0.220 in. |
| Drive Type | T40 6-lobe |
| Head Type | Washer head |
| Material | Carbon steel |
| Finish | Double-barrier coating, tan |
| Thread Style | Bold, fully threaded |
| Point Style | SawTooth point |
| Piece Count | 250 |
| Weight | 22.9 lbs |
Compatibility
Driver Interface Uses a T40 6-lobe drive bit for installation. Material Pairing Designed for wood-to-wood fastening, including structural members and mass timber connections. Exposure Use Double-barrier coating is intended for select exterior and preservative-treated wood applications.
Built For
Construction Carpentry General Contracting Remodeling Mass Timber Connections Ledger Fastening Exterior Wood Framing Fencing
Pro Tip
For long structural screws like this, keep steady pressure on the driver and let the SawTooth point do the starting work. If you back off pressure once the threads grab, that is when long screws are most likely to slip the bit and chew up the recess.
Warranty & Support
12 month warranty listed in supplementary product data.
Tool Nut’s Take
Tool Nut’s Take
Simpson Strong-Tie SDWS22800DBMB Strong-Drive SDWS Timber Screws for real structural wood work
This is the kind of long structural wood screw you buy when a regular wood screw is not even in the conversation.
- Who it’s for: Builders, framers, fence crews, and remodelers doing heavy wood-to-wood fastening, especially outdoors.
- Why it stands out: The combination of SawTooth point, T40 6-lobe drive, washer head, and double-barrier coating makes it faster to install and better suited to exterior structural work than general-purpose screws.
- Worth knowing: This is a 250-pack of 8 inch structural screws weighing 22.9 pounds, so it is a jobsite quantity fastener, not a small weekend hardware pack.
Common Questions
- What is this screw designed for? It is designed for structural wood-to-wood fastening, including ledger applications, lap joints, surface splines, and mass timber connections.
- Does it require predrilling? Supplementary product data states the SawTooth point eliminates the need for predrilling in almost every application.
- What driver bit does it use? It uses a T40 6-lobe drive.
- Is it suitable for exterior use? Yes. It is an exterior-grade screw with a double-barrier coating intended for select exterior and preservative-treated wood applications.
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