The Simpson Strong-Drive SDWH Timber-Hex Screw with Double-Barrier Coating is a heavy-duty structural fastener engineered for wood-to-wood connections and general-purpose framing tasks where a hex-head drive is the preferred method. Designed to meet the demands of both professional contractors and do-it-yourself builders, this 0.195 in. shank diameter, 10 in. long timber screw delivers reliable holding strength without the need for pre-drilling, saving significant time on the job site compared to traditional lag bolts. Code listed under IAPMO-UES ER-192 and compliant with 2015 and 2018 IRC and IBC requirements, it is a trusted choice for a wide range of structural wood framing applications.

Key Features

• Double-Barrier Coating - provides corrosion protection equivalent to hot-dip galvanization, making this timber screw suitable for exterior and preservative-treated wood environments where moisture resistance matters.
• SawTooth Point - bites into wood fibers aggressively for fast, self-starting installation without pre-drilling, reducing labor time on structural and general-purpose fastening jobs.
• Large Hex Washer Head (0.650 in. diameter) - the oversized bearing surface distributes load more evenly across the wood, improving pull-through resistance and connection integrity.
• 5/16 in. Hex Drive - compatible with standard hex-head impact drivers and socket tools, allowing faster installation with common job-site equipment compared to specialty bits.
• 10 in. length with 2-3/4 in. thread engagement - provides deep penetration into structural members, increasing withdrawal resistance and overall joint strength in timber connections.
• 6 TPI (threads per inch) coarse threading - optimized for wood-to-wood fastening, gripping fibrous material firmly and resisting loosening under load or vibration.
• Code listed under IAPMO-UES ER-192 and meets 2015 and 2018 IRC and IBC requirements - enables use on permitted structural projects with confidence, simplifying the inspection and approval process.

Why This Product

• The SawTooth point eliminates the pre-drilling step required by traditional lag bolts, making timber connections faster to complete on structural framing and crating applications without sacrificing holding strength.
• The Double-Barrier Coating delivers hot-dip galvanization-level corrosion resistance, making this screw a dependable option for outdoor framing projects and applications involving preservative-treated lumber.
• Compliance with 2015 and 2018 IRC and IBC codes through IAPMO-UES ER-192 listing means this fastener is suitable for inspected, permitted structural work - removing guesswork from code-critical connections.
• The combination of a large hex washer head and 5/16 in. hex drive means this screw works efficiently with standard impact drivers and sockets already on the job site, reducing the need for specialty tools.

Specifications

• Brand: Simpson Strong-Tie
• Shank Diameter: 0.195 in.
• Length: 10 in.
• Head Type: Large Hex Washer Head
• Head Diameter: 0.650 in.
• Drive Type: 5/16 in. Hex
• Thread Length: 2 3/4 in.
• TPI: 6
• Point Type: SawTooth Point
• Coating: Double-Barrier Coating
• Finish: Double-Barrier Coating
• Code Listing: IAPMO-UES ER-192; meets 2015 and 2018 IRC and IBC requirements

Available Pack Options

• SDWH191000DB-RP1: 1 Ea
• SDWH191000DB-R12: 12 Pk - includes one 5/16-in. hex driver bit
• SDWH191000DB-R50: 50 Pk - includes one 5/16-in. hex driver bit
• SDWH191000DB: 250 Pk - includes two 5/16-in. hex driver bits

Approved Applications

• Fastening Wood-to-Wood
• Crating

Frequently Asked Questions

Does this screw require pre-drilling before installation?

No. The SawTooth Point is designed to self-start in wood, eliminating the need for pre-drilling and allowing faster installation compared to traditional lag bolts.

What drive tool is needed to install this timber screw?

This screw uses a 5/16 in. hex drive, which is compatible with standard hex-head sockets and impact drivers commonly found on most job sites.

Is this screw approved for use in structural wood framing under current building codes?

Yes. The Strong-Drive SDWH Timber-Hex Screw is code listed under IAPMO-UES ER-192 and meets 2015 and 2018 IRC and IBC requirements for several common structural wood framing applications, making it suitable for permitted and inspected work.

Can this screw be used with exterior or preservative-treated lumber?

The Double-Barrier Coating provides corrosion protection equivalent to hot-dip galvanization, making this screw suitable for some exterior and preservative-treated wood applications. Always verify compatibility with the specific treatment chemical and local code requirements for your project.