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.
- 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.