Built for Structural Wood This Simpson Strong-Tie SDWS16312Q Strong-Drive SDWS Framing Screw is made for wood-to-wood fastening where holding power matters. It is code-listed for structural framing, remodeling, and engineered wood work. Fast Starts, Less Fight The SawTooth Type-17 point starts quickly and cuts installation torque, so you spend less time leaning on the drill. In most applications, it also eliminates the need for predrilling. Outdoor-Ready Finish Quik Guard coating helps protect the screw in indoor and outdoor use, including treated lumber. The low-profile washer head also gives strong bearing with clean countersinking.
The Simpson Strong-Tie SDWS16312Q Strong-Drive SDWS Framing Screw is a 3-1/2 inch structural wood screw built for wood-to-wood fastening in framing, remodeling, and engineered wood applications. This is a framing screw designed for structural wood fastening. Model Number: SDWS16312Q. If you want a code-listed alternative to slower fastening methods for framing and general structural connections, this screw is built for that job.
What matters here is how the features work together during installation. The SawTooth Type-17 point helps the screw start fast and reduces installation torque, which means less resistance at the driver and less need to predrill in most applications. The serrated threads keep the screw moving efficiently through the wood, and the T25 6-lobe drive gives solid bit engagement so the driver stays planted instead of camming out under load.
The head design is just as important. Simpson uses a low-profile washer head with underhead box nibs, which gives you increased bearing surface in structural applications while still allowing clean countersinking. That makes this screw a good fit where you need the head to seat neatly without giving up clamping force. For framing, ledger-style wood connections, blocking, and general fastening wood-to-wood, that combination saves time and leaves a cleaner finished connection.
In terms of build, the SDWS16312Q uses a 0.160 inch shank diameter and a 0.450 inch head diameter with an 8-1/2 TPI thread pattern and 2 inch thread length. On the job, that translates into a structural fastener that is sized for serious wood fastening rather than light trim or finish work. It is designed to pull members together and hold them there, whether you are working with dimensional lumber or engineered wood components.
For real-world jobsite use, the Quik Guard coating is a big part of the appeal. It is intended for indoor and outdoor applications, and the product data also calls out use with treated lumber. That makes the screw more versatile for contractors and serious DIY users who move between indoor framing, exterior structures, and general-purpose wood construction without wanting separate fastener inventories for every task.
This specific package includes 750 screws, so it is clearly aimed at high-volume work rather than a one-off repair. Carpenters, framers, remodelers, deck builders, and general contractors are the obvious users. Serious DIY builders tackling sheds, pergolas, framing repairs, or other structural wood projects will also get the value here, especially if they want a fastener that installs cleanly with a T25 bit and is built for more than basic wood screw duty.
This is the kind of screw you reach for when you need structural wood fastening to move quickly without fighting the fastener. It is built to start fast, track cleanly, and keep the bit engaged when you are driving into framing stock.
The head design does more than just sit flush. It gives the screw increased bearing for structural connections while still leaving a cleaner finished seat in the wood.
The point is one of the real reasons this screw works so well in the field. It is designed to bite quickly into wood and reduce the effort it takes to keep the screw moving.
With a 3-1/2 inch overall length and 750-count packaging, this is not a light-duty box of general wood screws. It is aimed at repetitive structural fastening where consistency, holding power, and installation speed matter every day.
T25 installation bit and driver are not listed as included.
| Fastener Type | Hand-Drive Screw |
|---|---|
| Application | Fastening Wood-to-Wood |
| Length (in.) | 3-1/2 in. |
| Shank Diameter (in.) | 0.160 in. |
| Head Diameter (in.) | 0.450 in. |
| Drive Type | T25 6-Lobe |
| Head Type | Low Profile Head |
| Thread Type | Serrated Threads |
| TPI | 8-1/2 |
| Thread Length (in.) | 2 in. |
| Point Type | SawTooth Type-17 Point |
| Coating / Finish | Quik Guard Coating |
| Material | Carbon Steel |
| Packaging Quantity | 750 |
Bit Interface Uses a T25 6-lobe drive. Product data specifically calls for a T25 bit for installation. Work Material Designed for wood-to-wood and engineered-wood applications, including framing and treated lumber use. Code Status API Approval is listed as Approved – Full for this fastener family.
Carpentry Construction General Contracting Remodeling Wood Framing Engineered Wood Indoor / Outdoor Projects DIY / Hobbyist
Run the SDWS16312Q straight into the side grain of the wood main member and let the SawTooth point do the work before you lean on the drill. If you start crooked, even a good 6-lobe drive cannot save the connection from tracking off line.
Tool Nut’s Take
If you need a structural wood screw that installs fast, seats clean, and holds like it should, this one earns its place in the truck.
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