Key Features
Drives Fast The SawTooth point starts quickly and usually eliminates predrilling in wood-to-wood fastening. That means less time setting up and less strain on the drill when you are running a lot of screws. Exterior Ready Double-barrier coating gives this timber screw corrosion resistance equivalent to hot-dip galvanization for approved exterior and treated-wood applications. If the job lives outside, that matters. Strong Hold The bold thread design and large washer head give the Simpson Strong-Tie timber screw strong pull-down and bearing performance for structural wood connections, ledgers, and other heavy wood-to-wood work.
Overview
Simpson Strong-Tie SDWS22500DBMB Strong-Drive SDWS Timber Screws (Exterior Grade) is a 5 inch structural wood screw built for high-strength wood-to-wood fastening in exterior applications. This is a wood screw designed for structural wood-to-wood fastening. Model Number: SDWS22500DBMB. If you need a cleaner, faster alternative to through-bolting or traditional lag screws, this is the kind of fastener that saves time without giving up holding power.
This specific SDWS timber screw uses a 0.220 inch shank, a 5 inch overall length, and a 3 inch thread length. In practical terms, that gives you the reach for thicker members while still pulling material together hard. The bold thread design is there for a reason: it bites aggressively and holds well in structural wood connections. The large washer head spreads load over a bigger surface area, which helps when you want solid clamp force without burying a small head into the face of the lumber.
One of the biggest real-world advantages here is installation speed. Simpson Strong-Tie uses a SawTooth point that starts quickly, reduces installation torque, and eliminates predrilling in most applications. On the job, that means less time leaning on the drill and less frustration when you are driving a full box into framing, ledgers, posts, or outdoor structures. The T40 6-lobe drive also matters more than it sounds like it should. It gives better bit engagement, helps prevent cam-out, and is easier on the bit when you are running repeated fasteners.
The head design is built around clean structural fastening, not just convenience. Underhead nibs help the head seat flush with reduced splintering, so the finished connection looks cleaner and the screw head sits where it is supposed to sit. Simpson Strong-Tie also marks the screw heads for size identification, which is a small detail until you have multiple lengths on site and need to sort fasteners quickly without guessing.
For exterior work, the coating is a major part of the story. This version uses double-barrier coating, which Simpson Strong-Tie rates for corrosion resistance equivalent to hot-dip galvanization and suitable for certain exterior and preservative-treated wood applications as described in the evaluation report. That makes this a practical choice for outdoor framing, fences, planter boxes, pergolas, ledgers, and other exposed wood connections where basic interior fasteners would be the wrong call.
The Simpson Strong-Tie SDWS22500DBMB Strong-Drive SDWS Timber Screws (Exterior Grade) is also part of a broader fastening system rather than a one-off specialty screw. It is intended for structural wood-to-wood and engineered wood applications, including ledgers and certain mass timber connections such as cross-laminated timber wall-to-wall, floor-to-floor, surface spline, and lap joint work. That gives contractors a fastener they can use across a wide range of structural and outdoor builds instead of bouncing between lag screws, bolts, and general-purpose deck screws.
This pack includes 250 screws in tan, which makes sense for crews, builders, and serious DIY users who are buying for an actual project instead of a one-off repair. If you are building exterior wood structures and want speed, strong engagement, and a cleaner install than traditional lag hardware, this is the right kind of screw. It is especially well suited for contractors, deck and fence builders, remodelers, and anyone doing repeated structural fastening in wood where installation time and consistent drive quality actually affect the job.
Fast Starts in Real Wood
This screw is built to get moving quickly in wood. When you are fastening rails, posts, or other exterior framing members, a fast-starting point saves time on every single drive.
- SawTooth point helps the screw start fast and reduces installation torque
- Predrilling is not needed in most applications according to Simpson Strong-Tie
Built for Ledger and Structural Connections
Ledger fastening is where a structural screw needs to do more than just go in. The large washer head and bold thread are there to create a strong connection and solid clamp force in wood-to-wood work.
- Designed for structural wood-to-wood and engineered wood applications including ledgers
- Large washer head increases bearing area compared with smaller head designs
Holds Up Outdoors
Outdoor structures need the right coating, not just a long screw. This version is made for approved exterior and treated-wood use where basic interior fasteners will not last.
- Double-barrier coating provides corrosion resistance equivalent to hot-dip galvanization
- Suitable for certain exterior and preservative-treated wood applications
Good Fit for Outdoor Builds
Not every structural screw ends up hidden in a wall. For exposed exterior builds like planter boxes, landscape structures, and outdoor wood assemblies, clean seating and consistent drive quality make the work look better and go faster.
- Underhead nibs help the head drive flush with reduced splintering
- Tan finish blends better with many exterior wood projects than bright hardware
What’s in the Box
- (250) Simpson Strong-Tie SDWS22500DBMB 5 in. Strong-Drive SDWS Timber Screws
Key Specifications
| Application | Fastening Wood-to-Wood |
|---|---|
| Length (in.) | 5 in. |
| Shank Diameter (in.) | 0.220 in. |
| Head Diameter (in.) | 0.760 in. |
| Drive Type | T40 6-Lobe |
| Head Type | Washer Head |
| Thread Length (in.) | 3 in. |
| Point Type | SawTooth Point |
| Coating | Double-Barrier Coating |
| Color | Tan |
| Material | Carbon Steel |
| Piece Count | 250 |
Compatibility
Driver Interface Uses a T40 6-lobe drive for positive bit engagement during installation. Replacement Bit Replacement driver bit listed by Simpson Strong-Tie: BIT40T-134-R2. Material Use Designed for structural wood-to-wood and engineered wood connections, including certain ledger and mass timber applications.
Built For
Construction General Contracting Carpentry Remodeling Deck and Ledger Work Pergolas and Fences Exterior Wood Fastening DIY / Hobbyist
Pro Tip
If you are driving a lot of these into dense lumber, keep a fresh T40 bit on hand and let the SawTooth point start the hole before you really lean on the drill. You will get cleaner engagement and better bit life, especially on long runs of structural fastening.
Tool Nut’s Take
Tool Nut’s Take
Simpson Strong-Tie SDWS22500DBMB Strong-Drive SDWS Timber Screws (Exterior Grade) is the lag screw shortcut most builders actually want
You get structural wood fastening that goes in faster, bites hard, and makes more sense on a lot of exterior jobs than dragging out bolts and washers.
- Who it’s for: Contractors, deck and fence builders, remodelers, and serious DIY users working on exterior wood-to-wood connections.
- Why it stands out: The SawTooth point, T40 6-lobe drive, large washer head, and exterior-rated double-barrier coating all work together to make installation quicker and more dependable.
- Worth knowing: This is a structural wood screw, not a general-purpose deck screw. Use it where the connection actually calls for a heavier fastener and make sure the application matches Simpson Strong-Tie’s approved use guidance.
Common Questions
- What is this screw designed for? It is designed for structural wood-to-wood fastening, including applications such as ledgers and certain mass timber connections.
- Does it usually require predrilling? Simpson Strong-Tie states that the SawTooth point eliminates the need for predrilling in most applications.
- What drive does it use? This screw uses a T40 6-lobe drive.
- Is this suitable for exterior use? Yes. The double-barrier coating is intended for certain exterior and preservative-treated wood applications as described by Simpson Strong-Tie.
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