Simpson Strong-Tie SDWC15450B-KT Strong-Drive SDWC Truss Screw is a structural wood screw built for truss or rafter-to-plate and stud-to-plate connections in framing work. This is a structural wood screw designed for fastening roof and wall framing members in high-wind construction and other code-driven wood framing applications. Model Number: SDWC15450B-KT. If you want a fastener that gives you a strong connection without needing exterior access, this is the one this product was made for.

The big deal here is the fully threaded shank. On the job, that matters because the threads engage through the connection instead of only biting near the tip. That helps pull framing members together and keep them there. For truss and rafter work, that means a more secure roof-to-wall tie. For stud-to-plate fastening, it gives you a purpose-built alternative for connections where holding power and installation angle matter.

Simpson designed this screw around real framing workflow, not just lab numbers. The cap head is made to countersink into the double top plate so the head does not stand proud and get in the way of drywall crews or finish work. The wide tolerance on installation angle also helps when you are driving overhead or working in cramped stud bays where perfect drill positioning is not realistic.

The Type-17 point is there for a reason. It starts faster, cuts into wood more cleanly, and makes driving easier, especially when you are repeating the same connection over and over. Paired with the T30 6-lobe drive, you get solid bit engagement with less cam-out than a weaker drive style. That usually means less stripped heads, steadier driving, and better bit life when you are running a lot of screws in a day.

For jobsite practicality, this screw can be installed before or after exterior sheathing is applied. That gives framers flexibility depending on sequencing, crew size, and site access. Just as important, it can be installed from inside the structure, which is one of the main reasons contractors buy this style in the first place. Less exterior access work means less time on ladders or staging and an easier path on multi-story framing.

This specific SDWC15450B-KT version is the black E-coat model in the 4-1/2 inch length, packaged in a 500-count bucket-style kit. It uses a cap head, a T30 6-lobe drive, and a 4-1/4 inch thread length. The included metal installation guide tools help keep the screw at the proper angle, which is important because the connection performance depends on correct installation, not just the screw itself.

Material and finish matter with structural fasteners, too. This model uses steel construction with E-coat electrocoating and is recognized for use in chemically treated wood as described in the evaluation report referenced by Simpson Strong-Tie. If you are working in framing conditions where corrosion resistance and approved use matter, that is not filler spec talk. That is the kind of detail that helps you choose the right fastener before inspection, not after.

Who should buy it? Framers, builders, remodelers, and general contractors doing roof framing, wall framing, and high-wind connection work. It is also a good fit for crews that want a code-oriented fastening method that installs from the inside and keeps the head flush in the plate. If you are just looking for a generic wood screw, this is overkill. If you are doing truss fastening and plate connections the right way, this is exactly the kind of screw you buy on purpose.

Simpson Strong-Tie SDWC15450B-KT Strong-Drive SDWC Truss Screw gets the framing detail right

This is the kind of structural screw that earns its keep by making a specific connection faster, cleaner, and easier to install correctly.

• Who it's for: Framers, remodelers, and builders doing truss, rafter, and stud-to-plate fastening where proper connection hardware matters.
• Why it stands out: Full-thread holding power, a flush cap head, inside-the-structure installation, and guide tools in the box all make this more job-ready than a generic structural screw.
• Worth knowing: This is a purpose-built 4-1/2 in. black E-coat framing fastener in a 500-pack, so it makes the most sense when you are doing repeat structural connections, not one-off shop work.

• What is this screw designed for? It is designed for truss or rafter-to-plate and stud-to-plate connections in wood framing.
• Can it be installed from inside the building? Yes. One of the key benefits of the SDWC design is that installation can be done from inside the structure.
• Can fastening be done before or after exterior sheathing? Yes. Simpson states fastening can be performed before or after exterior sheathing is applied.
• What bit does it use? It uses a T30 6-lobe driver bit.
• Is it approved for treated wood use? Simpson states the SDWC15450 is recognized for use in chemically treated wood as described in the evaluation report.