The Simpson Strong-Tie 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 IRC and IBC code requirements for most common wood framing applications. The 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.
SawTooth point ensures fast starts, reduces installation torque and eliminates the need for predrilling in most applications

Bold thread design provides superior holding power

Underhead nibs allow for head to drive flush to surface with reduced splintering

Large low-profile washer head provides maximum bearing area (0.760-in head diameter)

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)

Length: 3-in