The Simpson Strong-Tie SDWS22500DB-R50 Strong-Drive SDWS TIMBER Screw is a 5 inch exterior-grade structural wood screw built for wood-to-wood fastening. This is a timber screw designed for structural wood-to-wood connections. Model Number: SDWS22500DB-R50. If you want a faster, easier alternative to through-bolting or traditional lag screws, this is the kind of fastener that saves time without giving up holding power.

For this specific pack, you get a 5 inch screw with a 0.220 inch shank diameter, 3 inch thread length, and a large 0.760 inch washer head. That combination matters because the bold thread is built to hold hard in wood while the wide head spreads load over a larger area. On real jobs, that means a more secure pull-down in structural wood assemblies like ledgers, posts, rails, and heavy exterior framing.

The point and head design do a lot of the work for you. Simpson Strong-Tie uses a SawTooth point to help the screw start fast, lower installation torque, and eliminate predrilling in most applications. Underhead nibs help the head seat flush with less splintering, which is especially useful when you want the hardware to finish clean on visible outdoor work.

Drive performance is another reason pros use this style of screw. The T40 6-lobe recess gives more positive engagement than a basic slot or Phillips style screw, so the bit stays planted better under load. That matters when you're driving long structural screws with an impact driver or drill and do not want stripped heads slowing the job down.

For exterior use, the double-barrier coating is the big story. Simpson Strong-Tie rates it for corrosion resistance equivalent to hot-dip galvanization, making it suitable for certain exterior and preservative-treated wood applications as described in the evaluation report. It is also listed as ACQ approved, which makes it a practical choice when treated lumber is part of the build.

This screw is intended for contractors and serious DIY users handling structural fastening, exterior framing, fencing, ledger work, and other heavy wood connections. It is also code listed in IAPMO UES ER-192 and meets IRC and IBC requirements for many common wood framing applications. Bottom line: if you need a structural exterior wood screw that installs faster than a lag and leaves a cleaner finished connection, this one earns its keep.

Simpson Strong-Tie SDWS22500DB-R50 Strong-Drive SDWS TIMBER Screw Gets Structural Work Done Faster

This is a smart pick when you want structural wood screw speed with lag-screw-level seriousness for exterior wood connections.

• Who it's for: Contractors, deck builders, framers, and serious DIY users doing exterior wood-to-wood fastening.
• Why it stands out: Fast-start SawTooth point, strong thread engagement, wide washer head, and a T40 drive that stays engaged when the load goes up.
• Worth knowing: This pack is 50 screws, and the driver bit is referenced separately, so make sure you have the right T40 bit on hand before the job starts.

• What is this screw designed for? It is designed for structural wood-to-wood fastening, including ledgers and certain engineered wood and mass timber connections.
• Do these usually require predrilling? Simpson Strong-Tie states the SawTooth point eliminates the need for predrilling in most applications.
• Is this suitable for exterior use? Yes. The double-barrier coating is described as offering corrosion resistance equivalent to hot-dip galvanization for certain exterior and preservative-treated wood applications.
• What bit does it use? It uses a T40 6-lobe drive, and Simpson Strong-Tie lists BIT40T-134-R2 as the replacement driver bit.