Simpson Strong-Drive SDWH TIMBER-HEX Stainless Steel Screw (0.185" x 5") 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 exceptional corrosion resistance in saltwater environments, coastal construction, and chemically demanding outdoor applications - making it a reliable choice wherever long-term structural integrity matters. The sharp point and box thread design allow installation without predrilling in most applications, saving time and labor on the job site. These fasteners meet 2018 and 2021 IRC and IBC code requirements for several common wood-framing applications, giving builders and contractors confidence in code compliance from the start.

Key Features

• Type 316 Stainless Steel Material and Finish - provides maximum corrosion protection in saltwater, chemical, and harsh outdoor environments where standard steel fasteners would fail prematurely
• No Predrilling Required - the sharp point and engineered thread design allow direct installation into wood in most applications, cutting installation time and eliminating a separate drilling step
• Hex Washer Head (0.455" diameter) - the large bearing area distributes clamping force over a wider surface, reducing the chance of pull-through and improving holding strength in structural connections
• 5/16 in. Hex Drive - accepts a standard hex socket driver, reducing cam-out risk and allowing high-torque driving with common impact tools
• Box Thread Design - unique raised-ridge thread technology significantly reduces driving torque, making it easier to drive long fasteners through dense framing lumber without overworking the tool
• 2-3/8 in. Thread Length - engineered thread engagement ensures strong pull-out resistance and a secure structural connection in the receiving member
• Driver Bit Included - the screw ships with a compatible driver bit, so you can begin work immediately without sourcing a separate accessory
• Meets 2018 and 2021 IRC and IBC Code Requirements - pre-qualified for common wood-framing applications, simplifying the inspection and permitting process on code-regulated projects

Why This Product

• A faster, stronger lag screw alternative - traditional lag screws require a pilot hole and a two-step installation process. The SDWH TIMBER-HEX screw drives directly into wood without predrilling in most applications, reducing installation steps and keeping crews moving efficiently on structural framing tasks.
• Built for corrosive environments - Type 316 stainless steel is widely recognized for its resistance to chlorides and corrosive chemicals, making this screw an appropriate choice for coastal framing, wet conditions, and applications involving pressure-treated lumber where corrosion protection is critical.
• Code-ready for common framing applications - compliance with 2018 and 2021 IRC and IBC requirements means these screws can be used with confidence on permitted projects without requiring additional engineering documentation for covered applications.
• Ready to drive out of the package - because a driver bit is included, there is no need to source a matching 5/16 in. hex bit separately, reducing preparation time before work begins.

Specifications

• Brand: Simpson Strong-Tie
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Length: 5 in.
• Shank Diameter: 0.185 in.
• Head Diameter: 0.455 in.
• Head Type: Hex Washer Head
• Drive Type: 5/16 in. Hex
• Thread Type: Box Threads
• Thread Length: 2 3/8 in.
• Point Type: Sharp Point
• Country of Origin: Taiwan

Available Pack Options

• SDWH19500SS-R10: 10 Pk - includes (1) driver bit
• SDWH19500SS-R100: 100 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 screw to be driven directly into wood without predrilling in most applications, making installation faster and more straightforward than traditional lag screws.

Are these screws suitable for use in corrosive or coastal environments?

Yes. These screws are manufactured from Type 316 stainless steel, which provides maximum corrosion resistance and is well-suited for saltwater, chemical exposure, and other harsh outdoor environments where standard steel fasteners would be prone to corrosion.

What drive tool or bit do these screws require?

These screws use a 5/16 in. hex drive. A compatible driver bit is included with the screws, so you can begin installation immediately without sourcing a separate bit.

Are these screws compliant with current building codes?

Yes. The Strong-Drive SDWH TIMBER-HEX stainless steel screw meets 2018 and 2021 IRC and IBC code requirements for several common wood-framing applications, supporting use on code-regulated construction projects.

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