The Simpson Strong-Drive DWP Wood SS #12 x 2-1/2" Flat Head Screw in Type 305 Stainless Steel is a load-rated structural fastener engineered for exterior applications where corrosion resistance and verified holding strength are critical. Designed by Simpson for use on decks, docks, boardwalks, and other outdoor structures exposed to moisture and harsh environmental conditions, this screw delivers reliable performance backed by testing in accordance with ICC-ES acceptance criteria AC233. The combination of a sharp point, box thread design, and 305 stainless steel construction makes it a trusted choice for exterior engineered structural connections where both longevity and load documentation matter.

Key Features

• Type 305 Stainless Steel material - provides high corrosion resistance for exterior, high-moisture, and severe-exposure environments such as docks and waterfront decks where standard fasteners would degrade prematurely.
• Load-rated per ICC-ES AC233 - tested for shear, pull-through, and withdrawal resistance, giving engineers, inspectors, and builders verified performance data for structural connections.
• Unique box thread design with raised-ridge technology - greatly reduces driving torque so more screws can be driven on a single battery charge, improving productivity on large-scale deck and dock projects.
• Specially designed sharp point - penetrates hard wood products and engineered wood with ease, reducing the need for pre-drilling and speeding up installation.
• T27 6-Lobe drive - provides a secure bit fit that reduces cam-out, resulting in easier driving and extended bit life over the course of a project.
• Flat head profile - sits flush with the surface after installation for a clean, finished appearance on decking and structural wood assemblies.
• Compatible with wood, engineered wood, and polymer materials - versatile across a wide range of exterior structural substrates commonly used in dock and deck construction.

Why This Product

• Built for severe corrosion environments - Type 305 stainless steel construction makes this screw the right fastener for waterfront structures, docks, and boardwalks where exposure to water and moisture demands more than standard coated fasteners can offer.
• Structural confidence backed by third-party testing - ICC-ES AC233 compliance means shear, pull-through, and withdrawal load ratings are independently verified, supporting code-compliant structural connections where documentation is required.
• Reduces installer fatigue and tool wear - the box thread's raised-ridge technology cuts driving torque significantly, so batteries last longer and installers drive more fasteners with less effort on large exterior projects.
• Engineered for real exterior structural use - this is not a general-purpose outdoor screw. It is a load-rated structural fastener purpose-built for demanding applications like deck framing, dock construction, and other exterior assemblies requiring proven performance.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #12
• Length: 2-1/2 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.: 56
• Country of Origin: Taiwan

Available Pack Options

• S12250WP5: 5 Lb (280) - includes (1) T27 6-lobe driver bit
• S12250WPB: 1750 Pk - includes (2) T27 6-lobe driver bits

Frequently Asked Questions

What makes the DWP Wood SS screw suitable for structural exterior applications?

The Strong-Drive DWP Wood SS has been tested in accordance with ICC-ES acceptance criteria AC233 and carries load ratings for shear, pull-through, and withdrawal resistance. This makes it appropriate for structural connections on decks, docks, and boardwalks where load documentation and code compliance are required.

What is the advantage of the box thread design on this screw?

The unique box thread design features raised-ridge technology that greatly reduces driving torque compared to conventional thread profiles. This allows more screws to be driven on a single battery charge and reduces fatigue during large exterior projects on docks, decks, and boardwalks.

Is Type 305 stainless steel appropriate for high or severe corrosion environments?

Yes. According to the product data, this screw is specifically designed for exterior structural connections exposed to high or severe corrosion conditions, such as docks and boardwalks near water. For seaside or saltwater applications, the use of Type 316 stainless steel is recommended instead.

What materials can the Strong-Drive DWP Wood SS flat head screw be used with?

This fastener is compatible with wood, engineered wood, and polymer materials, making it a versatile choice for a wide range of exterior structural assemblies including deck and dock construction.

Note: Product dimensions may differ from picture.