Simpson Strong-Drive® SDWS™ TIMBER Screw (Exterior Grade)

The Strong-Drive SDWS Timber screw is designed to provide an easy-to-install, high-strength alternative to through-bolting and traditional lag screws. This screw is ideal for the contractor and do-it-yourselfer alike. It is code listed in IAPMO UES ER-192 and meets 2018 and 2021 IRC® and IBC® code requirements for most common wood framing 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 Product Includes Retail and mini-bulk packs include one 6-lobe, T40 driver bit; bulk packs include two driver bits (BIT40T-134-R2) Patent Information US Patents 9,523,383; 11,181,138