The Simpson Strong-Drive DWP Wood Screw in #12 x 5" with Type 305 Stainless Steel finish is a heavy-duty, load-rated structural fastener engineered for exterior wood connections where corrosion resistance and reliable holding strength are non-negotiable. Designed specifically for demanding outdoor environments such as decks, docks, boardwalks, and similar structures exposed to moisture or corrosive conditions, this flat-head screw delivers both the performance and the tested load ratings that structural applications require. Its sharp point and unique box-thread design make it a go-to choice for professionals tackling exterior wood framing, dock construction, and general structural fastening near water.

Key Features

• Type 305 Stainless Steel material and finish - provides elevated corrosion resistance compared to standard plated fasteners, making it well-suited for exterior structural connections in high-moisture or severe-exposure environments like docks and waterside decks.
• Unique box-thread design with raised-ridge technology - greatly reduces driving torque so installers can drive more screws per battery charge, improving productivity on large deck and dock projects.
• Specially designed sharp point - penetrates hard wood and dense exterior materials with ease, eliminating the need for pre-drilling in many applications and speeding up installation.
• T27 6-Lobe drive type - provides a secure, positive bit-fit that reduces cam-out, resulting in cleaner drives, longer bit life, and less installer fatigue over a full workday.
• Flat head profile with 0.435 in. head diameter - sits flush with the wood surface for a clean finish and reduced snag risk on deck and dock walking surfaces.
• Tested to ICC-ES acceptance criteria AC233 - load-rated for shear, pull-through, and withdrawal resistance, giving engineers and inspectors verifiable structural performance data for permitted projects.
• 5-inch length in a #12 screw size - delivers deep fastener penetration for strong connections through thick composite layups, multiple framing members, or heavy exterior decking materials.

Why This Product

• Built for high and severe corrosion environments - Type 305 Stainless Steel construction means this screw is purpose-built for docks, boardwalks, and waterfront decks where standard galvanized or coated fasteners may fail prematurely due to constant moisture exposure.
• Load-rated for structural confidence - unlike generic wood screws, the DWP Wood SS has been independently tested to ICC-ES AC233 criteria and carries published shear, pull-through, and withdrawal values, supporting use in engineered structural connections that require documented fastener performance.
• Reduces installation time and tool wear - the box-thread geometry lowers driving torque noticeably, which translates directly into faster installation, fewer battery changes, and extended bit life on large-scale exterior projects.
• Flat-head design suits deck and dock surface work - the countersinking flat head creates a flush, smooth surface finish on walking surfaces, reducing trip hazards and providing a professional appearance on finished deck and dock installations.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #12
• Length: 5 in.
• Head Type: Flat Head
• Head Diameter: 0.435 in.
• Drive Type: T27 6-Lobe
• Thread Type: Box Threads
• Point Type: Sharp Point
• Material: Type 305 Stainless Steel
• Finish: Type 305 Stainless Steel
• Approx. Count Per Lb.: 29
• Country of Origin: Taiwan

Available Pack Options

• S12500WP1: 1 Lb (29) - includes (1) T27 6-lobe driver bit
• S12500WP5: 5 Lb (145) - includes (1) T27 6-lobe driver bit
• S12500WPB: 500 Pk - includes (2) T27 6-lobe driver bits

Approved Applications

• Deck construction and structural decking connections
• Dock and boardwalk framing and surface fastening
• General exterior structural wood connections
• Applications near water or in high-corrosion and severe-corrosion exposure zones
• Connections to wood, engineered wood, and polymer materials requiring load-rated fasteners

Frequently Asked Questions

Is this screw suitable for dock and boardwalk applications near saltwater?

Yes. The Strong-Drive DWP Wood SS is specifically designed for dock, boardwalk, and deck applications exposed to high or severe corrosion conditions, including environments near water. It is constructed from Type 305 Stainless Steel for enhanced corrosion resistance. For seaside or direct saltwater exposure applications, consider upgrading to Type 316 stainless steel for additional protection.

What load values does this screw carry, and how was it tested?

The Strong-Drive DWP Wood SS has been tested in accordance with ICC-ES acceptance criteria AC233 and is load-rated for shear, pull-through, and withdrawal resistance. These published load values support its use in engineered exterior structural connections where fastener performance documentation is required for inspections or permits.

Does the box-thread design require a specific driver bit?

This screw uses a T27 6-Lobe drive, which requires a T27 Torx-compatible bit. The 6-lobe interface provides a secure fit that minimizes cam-out, extends bit life, and makes for cleaner, more controlled driving compared to conventional Phillips or square-drive fasteners.

Do I need to pre-drill when installing this screw into hard wood?

The DWP Wood SS features a specially designed sharp point that is engineered to penetrate hard wood and dense exterior materials with ease. In many applications this eliminates the need for pre-drilling, helping to speed up installation on deck and dock projects. Always follow applicable code requirements and the manufacturer's installation guidance for your specific application.

Note: Product dimensions may differ from picture. Please see the item description above for exact specifications.