Simpson Strong-Drive SDWH TIMBER-HEX Stainless Steel Screw (0.185" x 6") is a premium structural fastener engineered as a direct replacement for traditional lag screws in wood-framing applications. Constructed from Type 316 stainless steel, this hex-head screw delivers exceptional corrosion resistance in harsh outdoor environments, coastal exposures, and chemically treated lumber installations. Designed for professionals who need a reliable, code-compliant connection without the time-consuming step of predrilling, these timber screws streamline structural assembly while meeting 2018 and 2021 IRC and IBC code requirements for several common wood-framing applications.

Key Features

• Type 316 stainless steel construction - provides maximum corrosion protection in saltwater, chemical, and high-moisture environments where standard fasteners would degrade over time
• No predrilling required in most applications - reduces installation time and labor compared to traditional lag screws, allowing faster project completion
• 5/16 in. hex drive - compatible with standard hex sockets and impact drivers, making the fastener easy to drive with common tools on the job site
• Hex washer head with 0.455 in. head diameter - delivers a large bearing surface that distributes load effectively and reduces pull-through risk in structural connections
• Box thread design with sharp point - the unique thread profile significantly reduces driving torque, minimizing bit cam-out and installer fatigue during heavy framing tasks
• 0.185 in. shank diameter and 6 in. length - sized for deep, strong penetration into structural lumber, achieving robust shear and withdrawal values in timber connections
• 2-3/8 in. thread length - engineered thread engagement length ensures solid mechanical grip in the receiving member for reliable structural performance
• 2018 and 2021 IRC and IBC code compliant - meets current building code requirements for several common wood-framing applications, simplifying project approvals and inspections

Why This Product

• A true lag-screw replacement that saves time: Unlike traditional lag screws that demand predrilling pilot holes before every fastener, this structural timber screw installs directly into wood in most applications - cutting installation steps and keeping framing projects moving efficiently.
• Built for demanding environments: The Type 316 stainless steel material goes beyond standard corrosion resistance, making these screws a dependable choice where pressure-treated lumber, coastal air, or prolonged moisture exposure would compromise lesser fasteners.
• Engineered thread geometry reduces physical strain: The box thread design with raised-ridge technology lowers the torque needed to drive each fastener, which translates to less tool wear, less hand fatigue, and more consistent installation quality across large framing projects.
• Code-ready for professional framing work: Meeting 2018 and 2021 IRC and IBC requirements for several common wood-framing applications, these screws support straightforward inspections and documentation, making them a reliable choice for permitted residential and commercial construction.

Specifications

• Brand: Simpson Strong-Tie
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Length (in.): 6
• Shank Diameter (in.): 0.185
• Head Diameter (in.): 0.455
• Head Type: Hex Washer Head
• Drive Type: 5/16 in. Hex
• Thread Type: Box Threads
• Thread Length (in.): 2 3/8
• Point Type: Sharp Point
• Country of Origin: Taiwan

Available Pack Options

• SDWH19600SS-5: 5 Pk
• SDWH19600SS-R10: 10 Pk - includes (1) driver bit
• SDWH19600SS-R100: 100 Pk - includes (1) driver bit

Frequently Asked Questions

Do these screws require predrilling before installation?

No predrilling is necessary in most applications. The sharp point and box thread design allow the screw to self-start and drive directly into structural lumber, making installation faster and easier compared to traditional lag screws.

What makes Type 316 stainless steel the right material for structural timber screws?

Type 316 stainless steel provides maximum corrosion protection, making these fasteners well-suited for outdoor framing, coastal environments, high-moisture conditions, and use with chemically treated lumber where standard carbon-steel fasteners may corrode and lose structural integrity over time.

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

Yes. These fasteners meet 2018 and 2021 IRC and IBC code requirements for several common wood-framing applications, supporting compliant structural connections in both residential and commercial construction projects.

What tool is needed to drive these screws?

The screws use a 5/16 in. hex drive, which is compatible with standard hex socket bits and impact drivers commonly found on job sites. The hex washer head design also provides a large bearing surface for consistent, controlled driving.

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