Simpson Strong-Drive DWP Wood Screw in #12 x 3" with Type 305 Stainless Steel Flat Head is a load-rated structural fastener engineered for deck, dock, boardwalk, and general exterior applications where elevated corrosion resistance and verified load performance are critical. Built with Type 305 stainless steel, this screw delivers lasting protection against moisture and corrosion in demanding outdoor environments - making it a dependable choice for structural connections near water or in areas subject to high or severe corrosion exposure. Its flat head profile and sharp point make it well-suited for flush-finish installations in wood, engineered wood, and polymer materials.

Key Features

• Type 305 Stainless Steel material - provides superior corrosion resistance for exterior and near-water applications including docks, boardwalks, and decks exposed to high or severe corrosion conditions
• Unique box thread design with raised-ridge technology - greatly reduces driving torque so you can drive more screws on a single battery charge and work more efficiently through long installations
• Specially designed sharp point - penetrates hardwood and engineered wood products with ease, reducing the need for pre-drilling and speeding up installation
• T27 6-Lobe drive type - provides a secure bit fit that reduces cam-out, resulting in easier driving and extended bit life during high-volume fastening work
• Flat head with 0.435 in. head diameter - sits flush with the surface for a clean, finished appearance in decking and structural exterior applications
• Load-rated and tested to ICC-ES acceptance criteria AC233 - rated for shear, pull-through, and withdrawal resistance, giving engineers and builders confidence in structural performance documentation
• 3 in. length in #12 screw size - provides deep, reliable penetration for strong structural connections in exterior wood framing and decking assemblies

Why This Product

• Verified structural performance for load-critical applications - tested to ICC-ES AC233 and load-rated for shear, pull-through, and withdrawal, this screw meets the documentation requirements that engineered structural connections on docks, boardwalks, and decks often demand
• Built for high and severe corrosion environments - Type 305 stainless steel construction makes this fastener a reliable choice where standard steel screws would degrade prematurely, particularly in exterior structural connections near water
• Reduces installer fatigue and extends tool battery life - the box thread design with raised-ridge technology minimizes driving torque, a practical advantage on large deck and dock projects where hundreds of fasteners are driven in a single session
• Versatile fit for multiple exterior substrates - compatible with wood, engineered wood, and polymer materials, this screw handles the variety of materials common in modern deck and dock construction without the need to stock multiple fastener types

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #12
• Length: 3 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: 48
• Country of Origin: Taiwan

Available Pack Options

• S12300WP1: 1 Lb (48) - includes (1) T27 6-lobe driver bit
• S12300WP5: 5 Lb (240) - includes (1) T27 6-lobe driver bit
• S12300WPB: 1500 Pk - includes (2) T27 6-lobe driver bits

Approved Applications

• Deck construction and decking structural connections
• Dock and boardwalk fastening near water or in marine-adjacent environments
• General exterior structural applications requiring high or severe corrosion protection
• Connections in wood, engineered wood, and polymer materials
• Exterior applications requiring ICC-ES AC233 load-rated fasteners

Frequently Asked Questions

What load performance has the Strong-Drive DWP Wood SS screw been tested for?

These screws are structural fasteners that have been tested in accordance with ICC-ES acceptance criteria AC233. They are load-rated for shear, pull-through, and withdrawal resistance, making them suitable for use in engineered structural connections where documented load values are required.

Is Type 305 stainless steel suitable for dock and boardwalk applications?

Yes. The Type 305 stainless steel material provides high and severe corrosion resistance, making these screws well-suited for exterior structural connections on docks, boardwalks, and decks near water. For seaside or saltwater-adjacent applications, a Type 316 stainless steel option may be more appropriate.

What materials can these screws be driven into?

The Sharp Point and box thread design allow these screws to be driven into wood, engineered wood, and polymer materials. The sharp point is specifically designed to penetrate hard wood products with ease, reducing installation effort in dense substrates.

What drive bit is required for the T27 6-Lobe drive?

These screws use a T27 6-Lobe drive, which requires a compatible T27 6-lobe driver bit. The 6-lobe design provides a secure bit engagement that reduces cam-out and extends bit life compared to conventional drive types, particularly during high-volume fastening on deck and dock projects.

Note: Product dimensions may differ from picture. Please refer to the specifications listed above for accurate dimensions.