Key Features
Full-Length Grip The fully threaded shank bites along the entire fastener length, which helps lock roof and wall framing members together instead of relying on partial thread engagement. Installs From Inside This Simpson Strong-Tie truss screw can be installed from inside the structure, which helps reduce exterior upper-story work and makes roof-to-wall fastening more practical on the job. Drives Clean A cap head, Type-17 point, and T30 6-lobe drive make starts easier, improve bit engagement, and help the head countersink into the double top plate without getting in the way of drywall or finish work.
Overview
The Simpson Strong-Tie SDWC15600B-KT Strong-Drive SDWC Truss Screw is a 6-inch structural wood screw built for truss or rafter-to-plate and stud-to-plate connections in wood framing. This is a structural screw designed for roof-to-wall and stud-to-plate fastening in high-wind construction and interior framing applications. Model Number: SDWC15600B-KT. If you need a code-listed fastening option that can be driven from inside the structure, this is the fastener that solves that problem.
What matters here is how the fastener works in real framing. The fully threaded shank engages the entire length of the screw, which helps create a secure connection between framing members instead of grabbing only part of the material. On roof framing and wall framing connections, that full-thread design is the whole point. It is built to tie members together with more consistent engagement through the assembly.
The head and drive setup are jobsite-friendly. Simpson uses a cap-style head that countersinks into the double top plate, helping avoid interference with drywall and finish trades later. The T30 6-lobe drive gives solid bit engagement, so the screw is easier to control during installation and easier on the driver bit than a sloppy recess. The Type-17 point also helps the screw start faster and drive with less fighting, especially when you are working overhead or at an angle.
This screw is also designed around installation flexibility. Simpson notes a wide tolerance on installation angle, which makes proper placement easier in the field. Fastening can be done before or after exterior sheathing is applied, so crews have more freedom in sequencing. Just as important, the SDWC can be installed from inside the structure, which cuts down on exterior upper-story work and can improve safety on multi-level jobs.
For this specific model, the fastener measures 6 in. long with a 0.155 in. shank diameter, 0.335 in. head diameter, and 5-3/4 in. thread length. It uses a clear-zinc coating and an orange finish for easier inspection. Packaging quantity is 500 screws, making this a good fit for production framing crews, builders, and contractors who need enough stock on hand for repeated structural connections instead of buying small refill packs.
This kit version adds useful install hardware instead of just bulk screws. According to the provided package information, you get matched-tolerance driver bits and metal installation guide tools in the box. That matters because these are the accessories that help you actually place and drive the fastener correctly instead of piecing the system together separately.
From a standards and code standpoint, supplementary manufacturer and retailer data indicate the SDWC line is tested for uplift and lateral loads between wall plates and framing members and is code listed under IAPMO-UES ER-262, with references to 2018 and 2021 IRC and IBC requirements for common wood framing applications. For buyers comparing fastening methods, that gives this structural screw a clear place in engineered wood framing work where published load values and approved installation matter.
Who should buy it? Framers, builders, general contractors, and crews working in high-wind areas are the right audience. If you are fastening trusses, rafters, studs, and plates in wood framing and want a structural screw system that installs from inside with a purpose-built guide tool, the Simpson Strong-Tie SDWC15600B-KT Strong-Drive SDWC Truss Screw is the practical choice.
Made for Roof-to-Wall Connections
This screw is built for the connection itself, not just for holding trim or general lumber together. It is intended for truss or rafter-to-plate and stud-to-plate fastening where secure wood framing connections matter.
- Designed for truss/rafter-to-plate and stud-to-plate connections
- Suitable for high-wind construction applications
- Can be installed from inside the structure to reduce exterior upper-story work
Easier Starts and Better Drive Control
The geometry is doing real work here. The Type-17 point helps the screw start quickly, while the T30 6-lobe recess gives better driver engagement so you are not constantly fighting cam-out during installation.
- T30 6-lobe drive for positive engagement
- Type-17 point for faster starts and easier driving
- Cap head countersinks into the double top plate
Guide Tools Help Keep the Install Consistent
The included metal installation guide tool is one of the details that makes this kit easier to use in the field. It helps position the screw correctly, which is important when the fastening method and placement affect published load values.
- Metal installation guide tool is included
- Wide tolerance on installation angle helps simplify correct placement
- Fastening can be done before or after exterior sheathing is applied
What’s in the Box
- (500) Simpson Strong-Tie SDWC structural truss screws, 0.155 in. x 6 in., orange
- (2) Matched-tolerance driver bits
- (2) Metal installation guide tools
Key Specifications
| Length | 6 in. |
|---|---|
| Shank Diameter | 0.155 in. |
| Head Diameter | 0.335 in. |
| Thread Length | 5-3/4 in. |
| Drive Type | T30 6-Lobe |
| Head Type | Cap Head |
| Point Type | Type-17 Point |
| Coating | Clear Zinc Coating |
| Color | Orange |
| Packaging Quantity | 500 |
| Material | Carbon Steel |
| Weight | 19.7 lbs |
Compatibility
Driver Interface Uses a T30 6-lobe drive. Included Install Accessories Supplied with matched-tolerance driver bits and metal installation guide tools for the SDWC fastening method. Replacement Bit Manufacturer data lists replacement driver bit part number BIT30T-2-R2.
Built For
Construction General Contracting Carpentry Wood Framing Truss Installation Rafter-to-Plate Connections Stud-to-Plate Connections High-Wind Construction
Pro Tip
Use the included metal guide tool and the matched T30 bit instead of grabbing a worn shop bit. On structural screws like this, clean engagement and correct placement make the install go smoother and help avoid fighting the screw at the angle.
Warranty & Support
No manufacturer’s warranty is listed in the provided product data.
Tool Nut’s Take
Tool Nut’s Take
Simpson Strong-Tie SDWC15600B-KT Strong-Drive SDWC Truss Screw for serious framing work
This is the kind of structural screw that earns its keep when the connection matters more than the fastener price.
- Who it’s for: Framers, builders, and contractors handling truss, rafter, and stud-to-plate fastening in wood framing, especially on larger jobs where a 500-pack makes sense.
- Why it stands out: Full-thread engagement, inside-the-structure installation, a cap head that finishes clean in the plate, and included guide tools make it more than just a bulk box of screws.
- Worth knowing: This is a purpose-built structural fastening system, so use the correct placement and installation method if you are working to published load values.
Common Questions
- What is this screw used for? It is designed for truss/rafter-to-plate and stud-to-plate connections in wood framing.
- What drive does it use? This model uses a T30 6-lobe drive.
- Can it be installed after exterior sheathing is on? Yes. Manufacturer data states fastening can be performed before or after exterior sheathing is applied.
- What size is this screw? The screw is 6 in. long with a 0.155 in. shank diameter and 5-3/4 in. thread length.
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