The SDWC 6-inch truss screw eliminates exterior ladder work while providing code-compliant structural connections from inside the building. That’s the game-changing benefit here — you’re making truss-to-plate connections without ever setting foot on scaffolding or climbing an extension ladder in Montana winter conditions.
At 6 inches long with a 0.155-inch shank diameter, these fully threaded structural screws create maximum withdrawal and shear capacity. Position the included metal guide against the plate and drill at approximately 22 degrees. Drive until the head is flush or slightly countersunk (≤ 1/8”). The cap-style head countersinks flush with the top plate — no drywall interference.
Code Compliance and Testing
Testing follows ICC-ES AC233 and AC13 standards. Florida Building Code approval (FL 13975) and City of Los Angeles approval (COLA RR 25749) add credibility for contractors working on engineered projects.
The Clear-Zinc coating with Orange topcoat serves dual purposes — corrosion resistance and easy visual inspection by building officials. That orange coating matters during framing inspections. Inspectors can spot compliant connections from across the room.
Installation Efficiency vs Hurricane Ties
Traditional hurricane ties require climbing ladders, nailing from awkward angles, and dealing with Montana weather exposure. The SDWC installs from inside, eliminating scaffolding requirements entirely. Installation is faster than hurricane ties since no nailing is needed. The flush head design allows direct drywall installation without spacers or special detailing.
The kit includes 50 screws, one metal installation guide tool, and one T30 6-lobe driver bit. You’ll need a high-torque drill/driver and 1/8” drill bit. Allowed angles range from 4 to 30 degrees depending on configuration (Config A-D).
These screws work with 2x SPF, Hem-Fir, and Douglas Fir members, double top plates, single or double bottom plates, and chemically treated wood including ACQ. They’re also compatible with the Quik Stik rafter and truss fastening system.
Technical Specifications
| Specification | Value |
|---|---|
| Length | 6 inches |
| Shank diameter | 0.155 inches (overall) / 0.152 inches (listed in some retail descriptions) |
| Head type | Cap-style head (flush finish) |
| Drive type | T30 6-lobe |
| Coating | Steel with Clear-Zinc and Orange topcoat (corrosion-resistant) |
| Thread | Fully threaded shank for maximum withdrawal and shear capacity |
| Point type | Type-17 self-drilling point |
| Quantity | 50 screws per kit |
Professional Reception
The product holds a 4.8 out of 5 star rating aggregated from major retailers. Common praise includes significant time savings, easy installation using the included metal guide, and professional-grade quality. The main criticism centers on higher initial cost per box and the requirement for a specialized T30 bit (though it’s included in the kit).
One InterNACHI Forum discussion from January 2025 indicates that some users find working with SDWC screws potentially challenging, suggesting installation might require careful attention or experience. Concerns mentioned include potential difficulties in installation and the need for proper documentation during construction.
The bottom line? For Montana contractors dealing with winter construction schedules, eliminating exterior ladder work is worth the premium. These screws provide a code-compliant alternative to hurricane ties (per ESR-262). The time savings multiply on multi-unit projects where you’re making dozens or hundreds of connections. Just factor the higher per-fastener cost into your bid.
Simpson Strong-Tie backs the SDWC with their Limited Warranty, generally 1 year or limited lifetime depending on the product line, covering structural failure due to manufacturing defects. Full terms at strongtie.com/warranty.
Frequently Asked Questions
Q: What angle do I need to install Simpson Strong-Drive SDWC 6” screws?
The SDWC screws install at approximately 22 degrees using the included metal installation guide. Allowed angles range from 4 to 30 degrees depending on configuration (Config A-D), with the guide ensuring correct positioning against the plate.
Q: Can I use Simpson SDWC screws instead of hurricane ties?
Yes, the Simpson Strong-Drive SDWC provides a code-compliant alternative to hurricane ties per ESR-262. The screws eliminate the need for exterior ladder work since they install from inside the building, making them faster than traditional hurricane clips that require nailing.
Q: What size bit do I need for Simpson SDWC 6” truss screws?
The Simpson SDWC kit includes a T30 6-lobe driver bit, but you’ll also need a 1/8” drill bit and high-torque drill/driver. The T30 bit is specialized for these screws, which is why Simpson includes one in every 50-count kit.
Q: What wood types work with Simpson Strong-Drive SDWC screws?
The SDWC screws are compatible with 2x SPF, Hem-Fir, and Douglas Fir members, including double top plates and single or double bottom plates. They also work with chemically treated wood including ACQ and are compatible with the Quik Stik rafter and truss fastening system.
Q: Why are Simpson SDWC screws orange?
The Simpson Strong-Drive SDWC features a Clear-Zinc coating with Orange topcoat for corrosion resistance and easy visual inspection. Building officials can quickly identify compliant connections from across the room thanks to the distinctive orange color.
Q: What building codes approve Simpson SDWC 6” screws?
Additional approvals include Florida Building Code (FL 13975) and City of Los Angeles (COLA RR 25749), with testing per ICC-ES AC233 and AC13 standards.
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