Simpson Strong-Drive SDWH TIMBER-HEX Stainless Steel Screw - 0.275" x 6" is a heavy-duty structural fastener engineered as a direct replacement for traditional lag screws in wood-framing applications. Built from Type 316 stainless steel, this hex-head screw delivers superior corrosion resistance, making it the right choice for outdoor, coastal, and chemically exposed environments where standard carbon-steel fasteners would degrade over time. Designed for speed and code compliance, it eliminates the need for predrilling in most applications - saving significant labor time on the job site while still meeting 2018 and 2021 IRC and IBC structural requirements for common wood-framing tasks.

Key Features

• Type 316 Stainless Steel material and finish - provides maximum corrosion protection in saltwater, coastal, and chemically aggressive environments, far outlasting standard zinc-plated lag screws
• No predrilling required in most applications - sharp point design drives directly into wood framing, dramatically reducing installation steps and overall labor time compared to traditional lag screws
• 0.275" shank diameter with 6" length - engineered for deep structural penetration and strong holding power in heavy timber and dimensional lumber connections
• Hex washer head with 0.655" head diameter - large bearing surface distributes load evenly across the wood face, reducing the risk of pull-through and improving structural integrity
• 1/2 in. Hex drive type - compatible with standard impact drivers and hex sockets, making it easy to install with common jobsite tools without specialty bits
• Box thread design with 7 TPI and 3" thread length - raised-ridge box threads are engineered to significantly reduce driving torque, making installation easier and reducing driver fatigue
• Sharp point tip - self-starting point bites into wood immediately, enabling faster placement and reducing the chance of slipping during initial drive
• Meets 2018 and 2021 IRC and IBC code requirements - allows use on permitted and inspected projects with confidence that the fastener satisfies current structural code standards for wood framing
• Driver bit included in the box - immediate out-of-the-box usability, so you can start driving screws without sourcing a separate bit

Why This Product

• A genuine lag screw replacement that saves time: Traditional lag screws require predrilling a pilot hole before installation. This SDWH TIMBER-HEX screw's sharp point and box thread design allow direct installation in most applications, cutting prep steps and getting framing done faster.
• Built for harsh and corrosive conditions: Type 316 stainless steel is widely recognized for its resistance to chlorides, salt spray, and environmental moisture - making this screw a dependable structural fastener for decks, docks, ledger boards, and other exposed wood-frame structures.
• Code-ready for today's permitted projects: With compliance built in for both 2018 and 2021 IRC and IBC requirements, this screw is suitable for inspected residential and commercial wood-framing applications without the need for engineering workarounds.
• Reduced installation torque for consistent, controlled driving: The unique box thread geometry is specifically designed to lower the driving torque required, reducing wear on tools and installer fatigue on large-volume fastening tasks.

Specifications

• Brand: Simpson Strong-Tie
• Shank Diameter (in.): 0.275
• Length (in.): 6
• Finish: Type 316 Stainless Steel
• Material: Type 316 Stainless Steel
• Head Type: Hex Washer Head
• Head Diameter (in.): 0.655
• Drive Type: 1/2 in. Hex
• Thread Type: Box Threads
• Thread Length (in.): 3
• TPI: 7
• Point Type: Sharp Point
• Country of Origin: Taiwan

Available Pack Options

• SDWH27600SS-R10: 10 Pk - includes (1) driver bit
• SDWH27600SS-R50: 50 Pk - includes (1) driver bit

Frequently Asked Questions

Does this screw require predrilling before installation?

No - the SDWH TIMBER-HEX screw features a sharp point that allows direct installation into wood framing without predrilling in most applications. This is one of its primary advantages over traditional lag screws, which typically require a pilot hole before driving.

What drive tool is needed to install this screw?

This screw uses a 1/2 in. Hex drive, which is compatible with standard impact drivers and hex-socket drive tools commonly available on jobsites. A driver bit is included in the box to get started right away.

Is this screw suitable for use near saltwater or in chemically treated lumber applications?

Yes. The screw is manufactured from Type 316 stainless steel, which provides maximum corrosion protection and is well-suited for use in coastal, saltwater-adjacent, and chemically aggressive environments - including applications involving pressure-treated lumber.

Does this screw meet current building code requirements for structural wood framing?

Yes. The Simpson Strong-Drive SDWH TIMBER-HEX screw meets 2018 and 2021 IRC and IBC code requirements for several common wood-framing applications, making it appropriate for permitted and inspected construction projects.

Note: Product dimensions and/or thread length may differ from picture.