The Simpson Strong-Drive SDWS Timber Screw in 0.220" x 3" with Double-Barrier Coating is a high-strength structural fastener engineered as a direct, code-compliant alternative to traditional lag screws and through-bolts in wood framing and heavy timber connections. Featuring a SawTooth point, bold thread design, and a T40 6-lobe drive system, this black-coated timber screw delivers fast, reliable installation in a wide range of wood-to-wood fastening applications - from structural framing to crating. Its double-barrier coating provides corrosion resistance equivalent to hot-dip galvanization, making it well-suited for certain exterior and preservative-treated wood applications as described in its evaluation report.

Key Features

• SawTooth point tip - enables fast starts and reduces installation torque, eliminating the need for predrilling in most applications and speeding up the job
• Bold thread design with 5 TPI and 1-1/2" thread length - delivers superior holding power in wood-to-wood connections, providing a high-strength grip without through-bolting
• Washer head with 0.760" head diameter - creates a large bearing area that distributes load effectively and reduces the risk of surface pull-through
• Underhead nibs - allow the head to drive flush to the surface with reduced splintering, resulting in a clean, professional finish
• T40 6-lobe drive system - provides positive bit engagement that reduces cam-out, makes driving easier, and extends driver bit life
• Double-barrier coating finish - delivers corrosion resistance equivalent to hot-dip galvanization, supporting use in certain exterior and preservative-treated lumber applications
• Size identification on screw head - allows for quick on-site verification of the correct fastener, reducing installation errors
• Code listed in IAPMO UES ER-192 - meets IRC and IBC code requirements for most common wood framing applications, providing confidence for inspected and permitted work

Why This Product

• Eliminates predrilling in most applications - the SawTooth point tip drives cleanly into wood without a pilot hole, saving time and reducing the number of tools needed on site
• A tested, code-compliant replacement for lag screws and through-bolts - listed under IAPMO UES ER-192 and meeting IRC and IBC requirements, this screw simplifies the path to a passing inspection in common wood framing scenarios
• Suitable for exterior and treated-wood environments - the double-barrier coating, rated equivalent to hot-dip galvanization, makes this fastener a practical choice where preservative-treated lumber or outdoor exposure is a factor, as described in the evaluation report
• Designed for both professionals and DIYers - the straightforward T40 6-lobe drive and self-starting point make this timber screw approachable for a wide range of skill levels while still meeting structural performance standards

Specifications

• Brand: Simpson Strong-Tie
• Shank Diameter: 0.220 in.
• Length: 3 in.
• Head Diameter: 0.760 in.
• Head Type: Washer Head
• Drive Type: T40 6-Lobe
• Point Type: SawTooth Point
• Thread Length: 1 1/2 in.
• TPI: 5
• Coating: Double-Barrier Coating
• Finish: Double-Barrier Coating
• Color: Black
• Country of Origin: Taiwan

Available Pack Options

• SDWS22300DBB-R50: 50 Pk - includes one 6-lobe, T40 driver bit
• SDWS22300DBBMB: 250 Pk - includes one 6-lobe, T40 driver bit
• SDWS22300DBB: 950 Pk - includes two 6-lobe, T40 driver bits

Approved Applications

• Fastening Wood-to-Wood
• Crating

Install With

• SDWS screws install best with a low-speed 1/2-in. drill and 6-lobe, T40 driver bit (included)

Frequently Asked Questions

Do I need to predrill before installing these timber screws?

In most applications, predrilling is not required. The SawTooth point is specifically designed to start fast and reduce installation torque, allowing the screw to drive directly into wood without a pilot hole in the majority of common wood framing situations.

Is this screw appropriate for use with pressure-treated lumber?

Yes, for certain exterior and preservative-treated wood applications. The double-barrier coating provides corrosion resistance equivalent to hot-dip galvanization, making it suitable for these environments as described in the IAPMO UES ER-192 evaluation report.

What code requirements does this timber screw meet?

This screw is code listed in IAPMO UES ER-192 and meets IRC and IBC code requirements for most common wood framing applications, supporting use on inspected and permitted residential and commercial projects.

What drive tool should I use to install this screw?

These screws are designed for a T40 6-lobe driver bit. For best results, use a low-speed 1/2-in. drill paired with a 6-lobe T40 driver bit. The 6-lobe drive provides positive engagement that reduces cam-out and extends bit life during heavy-use installations.