Simpson Strong-Drive SDWH TIMBER-HEX Stainless Steel Screw - 0.275" x 8" is a heavy-duty structural fastener engineered as a direct lag-screw replacement for demanding wood-framing applications. Built from Type 316 stainless steel, these hex-head screws deliver exceptional corrosion resistance in saltwater, chemical-rich, and harsh outdoor environments where standard fasteners would quickly degrade. Designed for speed and strength, the SDWH TIMBER-HEX eliminates the need for predrilling in most applications, saving time on the job site while meeting 2018 and 2021 IRC and IBC code requirements for common wood-framing projects.

Key Features

• Type 316 Stainless Steel Material and Finish - provides maximum corrosion protection in wet, coastal, and chemically exposed environments, outperforming standard zinc or galvanized fasteners in harsh conditions
• No Predrilling Required - sharp point design penetrates wood directly without a pilot hole, reducing labor time and simplifying installation compared to traditional lag screws
• Hex Washer Head with 1/2 in. Hex Drive - the 0.655 in. head diameter creates a large bearing area that distributes load effectively, while the hex drive delivers high torque without cam-out
• Box Thread Design - unique thread profile with 7 TPI (threads per inch) significantly reduces driving torque, making it easier to seat the screw fully even in dense lumber
• 3 in. Thread Length - concentrated thread engagement at the tip provides strong pull-out resistance and secure anchoring in structural wood members
• Sharp Point - self-starting tip bites quickly into wood grain, enabling fast, accurate placement without wandering or splitting
• Meets 2018 and 2021 IRC and IBC Code Requirements - approved for several common wood-framing applications, giving builders and contractors confidence in code-compliant installations
• Driver Bit Included - eliminates the need to source a separate tool for installation, letting you get to work immediately right out of the package

Why This Product

• A true lag-screw replacement without the prep work - because no predrilling is needed in most applications, this screw cuts installation time significantly over traditional lag screws, making it ideal for ledger connections, structural framing, and other high-load wood joints
• Type 316 stainless steel is the right choice for corrosive environments - whether used in pressure-treated lumber, near saltwater, or in wet outdoor conditions, the 316 SS grade resists the chemical reactions that cause standard fasteners to corrode and fail
• Code-accepted for professional and permitted work - compliance with 2018 and 2021 IRC and IBC requirements means these fasteners can be used confidently in inspected structural applications without substitution concerns
• Engineered thread geometry reduces strain on tools and installer - the box thread design lowers driving torque compared to conventional screw profiles, reducing wear on impact drivers and physical fatigue during extended installations

Specifications

• Brand: Simpson Strong-Tie
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Length: 8 in.
• Shank Diameter: 0.275 in.
• Head Diameter: 0.655 in.
• Head Type: Hex Washer Head
• Drive Type: 1/2 in. Hex
• Thread Type: Box Threads
• Thread Length: 3 in.
• TPI: 7
• Point Type: Sharp Point
• Country of Origin: Taiwan

Available Pack Options

• SDWH27800SS-R10: 10 Pk - includes (1) driver bit
• SDWH27800SS-R25: 25 Pk - includes (1) driver bit

Frequently Asked Questions

Do these screws require predrilling before installation?

No - the sharp point and box thread design allow the SDWH TIMBER-HEX to be driven directly into wood without predrilling in most applications, saving significant time compared to traditional lag screws.

Why is Type 316 stainless steel used instead of Type 304 or standard zinc-plated finishes?

Type 316 stainless steel offers a higher grade of corrosion resistance than Type 304, making it better suited for applications in coastal environments, exposure to saltwater, contact with pressure-treated lumber, and other chemically aggressive conditions where long-term fastener integrity is critical.

Are these screws code-compliant for structural wood-framing applications?

Yes - the SDWH TIMBER-HEX meets 2018 and 2021 IRC and IBC code requirements for several common wood-framing applications, making them appropriate for use in permitted and inspected structural installations such as ledger connections.

What drive tool is needed to install these screws?

These screws use a 1/2 in. hex drive. A driver bit is included with your purchase, so you can begin installation right away with a compatible impact driver or drill.

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