Simpson Strong-Tie Strong-Drive SDWS TIMBER Screw (Exterior Grade)
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The Simpson Strong-Tie Strong-Drive® SDWS Timber Screw (Exterior Grade) is engineered to provide an easy-to-install, high-strength alternative to traditional lag screws and through-bolting in wood-to-wood structural connections. Its bold thread design ensures superior holding power, while the SawTooth® point facilitates fast starts and reduces installation torque, often eliminating the need for predrilling.
The large, low-profile washer head offers a substantial bearing area, and underhead nibs allow the head to sit flush with the wood surface, minimizing splintering.
Equipped with a 6-lobe T40 drive, it ensures positive engagement for easier driving and extended bit life. The double-barrier coating provides corrosion resistance equivalent to hot-dip galvanization, making it suitable for exterior and preservative-treated wood applications.
Key Features
- Bold thread design provides superior holding power
- SawTooth® point ensures fast starts, reduces installation torque and eliminates the need for predrilling in most applications
- Underhead nibs allow for head to drive flush to surface with reduced splintering
- Large washer head provides a large bearing area
- Size identification on all SDWS screw heads
- 6-lobe T40 drive provides positive engagement that makes the screw easy to drive and improves bit life (replacement driver bit — BIT40T-134-R2)
- Double-barrier coating provides corrosion resistance equivalent to hot-dip galvanization, making it suitable for certain exterior and preservative-treated wood applications, as described in the evaluation report
Applications
- Structural wood-to-wood/engineered including ledgers; mass timber connections including CLT wall-to-wall, floor-to-floor, surface splines and lap joints