Simpson Strong-Tie Strong-Drive SDWS SDWS22400DB-R12 Timber Screw, 4 in L, Washer Head, 6-Lobe Drive, Steel

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. SawTooth® point ensures fast starts, reduces installation torque and eliminates the need for pre-drilling in most applications Bold thread design provides great holding power Under-head 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 Six-lobe T40 drive provides positive engagement that makes the screw easy to drive and improves bit life Double-barrier coating provides corrosion resistance equivalent to hot-dip galvanization, making it suitable for certain exterior and preservative-treated-wood applications