The Simpson Strong-Drive SDWH Timber-Hex Screw with Double-Barrier Coating delivers reliable structural and general-purpose wood fastening with a 5/16 in. hex drive for easy installation using standard impact drivers and wrenches. Engineered for both contractors and do-it-yourselfers, this 0.195 in. shank diameter, 8 in. structural screw features a Large Hex Washer Head and a SawTooth Point that bites into wood quickly and cleanly. Code listed under IAPMO-UES ER-192, it meets 2015 and 2018 IRC and IBC requirements for common wood framing applications, making it a trusted choice wherever a compliant, hex-head timber screw is required.

Key Features

• Double-Barrier Coating - provides corrosion resistance equivalent to hot-dip galvanization, making this screw suitable for exterior conditions and use with preservative-treated lumber
• SawTooth Point - bites into wood fiber aggressively for fast starts and reduced driving force, eliminating the need for pre-drilling in many applications
• Large Hex Washer Head (0.650 in. diameter) - distributes clamping load over a wider bearing surface, reducing pull-through risk in structural wood connections
• 5/16 in. Hex Drive - compatible with standard hex-drive impact wrenches and sockets, speeding up installation on the job site compared to specialty bit drivers
• 6 TPI coarse thread with 2-3/4 in. thread length - maximizes thread engagement in the receiving member for strong, secure wood-to-wood fastening
• Code listed under IAPMO-UES ER-192 - meets 2015 and 2018 IRC and IBC requirements for common wood framing applications, so inspectors and engineers can accept your work with confidence
• 8 in. overall length with 0.195 in. shank diameter - provides deep penetration into thick timber members, supporting structural connections that shorter fasteners cannot achieve

Why This Product

• When structural wood connections must pass code inspection, the IAPMO-UES ER-192 listing and compliance with 2015 and 2018 IRC and IBC requirements means fewer callbacks and faster approval on framing projects.
• The Double-Barrier Coating offers hot-dip galvanization-equivalent protection, so this screw holds up in exterior environments and alongside preservative-treated wood without premature corrosion.
• The SawTooth Point starts in wood without pre-drilling, saving measurable time on repetitive fastening tasks like crating and wood-to-wood framing compared to traditional lag bolt installation.
• The 5/16 in. hex drive works with common impact wrenches already on the job site - no specialty bits required - making this screw accessible for contractors and do-it-yourselfers alike.

Specifications

• Brand: Simpson Strong-Tie
• Shank Diameter: 0.195 in.
• Length: 8 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/Finish: Double-Barrier Coating
• Code Listing: IAPMO-UES ER-192
• Code Compliance: Meets 2015 and 2018 IRC and IBC requirements for several common wood framing applications

Available Pack Options

• SDWH19800DB-RP1: 5 Pk
• SDWH19800DB-R12: 12 Pk - includes one 5/16-in. hex driver bit
• SDWH19800DB-R50: 50 Pk - includes one 5/16-in. hex driver bit
• SDWH19800DBMB: 250 Pk - includes one 5/16-in. hex driver bit
• SDWH19800DB: 500 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?

In many applications, pre-drilling is not required. The SawTooth Point is designed to pierce and drive into wood fiber quickly, reducing installation time compared to traditional lag bolts that typically need a pilot hole.

Is this screw suitable for use with pressure-treated lumber or exterior applications?

Yes. The Double-Barrier Coating provides corrosion resistance equivalent to hot-dip galvanization, making this screw suitable for some exterior and preservative-treated wood applications.

What tools are needed to drive this screw?

This screw uses a 5/16 in. hex drive, which is compatible with standard hex sockets and impact wrenches commonly found on job sites. No specialty driver bits are required.

What building codes does this screw comply with?

The Strong-Drive SDWH Timber-Hex screw is code listed under IAPMO-UES ER-192 and meets the requirements of both the 2015 and 2018 editions of the IRC (International Residential Code) and IBC (International Building Code) for several common wood framing applications.