The Simpson Strong-Drive DWP Wood Screw in #14 x 3-1/2", Type 316 Stainless Steel with a Flat Head is a load-rated structural fastener engineered for demanding exterior applications where both strength and long-term corrosion resistance are critical. Designed by Simpson for use on decks, docks, boardwalks, and other outdoor structures exposed to moisture, saltwater, and severe corrosive environments, this screw delivers reliable shear, pull-through, and withdrawal performance backed by testing in accordance with ICC-ES acceptance criteria AC233. The combination of Type 316 stainless steel construction and a purpose-built thread geometry makes this fastener a trusted choice for structural connections in coastal and high-humidity settings.

Key Features

• Type 316 Stainless Steel material - provides superior resistance to saltwater, chlorides, and harsh outdoor elements, making it the right choice for seaside and marine-adjacent construction where standard stainless would corrode prematurely.
• Unique box thread design with raised-ridge technology - significantly reduces driving torque so installers can drive more fasteners per battery charge, improving productivity on large deck and dock projects.
• Specially designed sharp point - penetrates hardwoods, engineered wood, and polymer materials with ease, eliminating the need for pre-drilling in many applications and speeding up installation.
• T27 6-Lobe drive - creates a secure bit-to-fastener fit that minimizes cam-out, extends bit life, and results in a cleaner, faster drive even in tight or awkward framing positions.
• Flat head profile - sits flush with or slightly below the material surface for a clean, finished appearance on visible decking, dock boards, and exterior cladding.
• Load-rated for shear, pull-through, and withdrawal resistance - tested to ICC-ES AC233 acceptance criteria, giving engineers and inspectors the documentation needed for permitted structural assemblies.
• Compatible with wood, engineered wood, and polymer materials - offers versatility across a wide range of exterior structural applications without changing fastener type.

Why This Product

• Built for severe corrosion environments - Type 316 stainless steel is specifically formulated to resist the chloride-rich conditions found near oceans, saltwater bays, and treated lumber chemicals, where lower-grade fasteners fail prematurely and compromise structural integrity.
• Structural accountability on permitted projects - ICC-ES AC233 load ratings for shear, pull-through, and withdrawal give builders and inspectors verified performance data, reducing the risk of failed inspections or structural liability on decks, docks, and boardwalks.
• Reduces fatigue and cost on large installations - the box thread's reduced driving torque means fewer drained batteries and less installer fatigue when driving hundreds of fasteners across a full deck or dock project.
• Sharp-point entry with no pre-drilling required - the engineered tip drives cleanly into hard and engineered wood products, cutting labor time and keeping job sites moving efficiently without extra tooling steps.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #14
• Length: 3-1/2 in.
• Head Type: Flat Head
• Head Diameter: 0.460 in.
• Drive Type: T27 6-Lobe
• Thread Type: Box Threads
• Point Type: Sharp Point
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Approx. Count Per Lb.: 33
• Country of Origin: Taiwan

Available Pack Options

• T14350WP1: 1 Lb (33) - includes (1) T27 6-lobe driver bit
• T14350WP5: 5 Lb (165) - includes (1) T27 6-lobe driver bit
• T14350WPB: 750 Pk - includes (2) T27 6-lobe driver bits

Frequently Asked Questions

What makes Type 316 stainless steel appropriate for dock and waterfront deck applications?

Type 316 stainless steel contains a higher molybdenum content than standard 304-grade stainless, which gives it significantly greater resistance to chlorides, saltwater, and the corrosive chemicals found in pressure-treated lumber. Simpson specifies this material for the DWP Wood SS screw precisely for seaside, dock, and severe-corrosion environments where lesser fasteners would degrade and lose structural integrity over time.

Is this screw load-rated for permitted structural applications?

Yes. The Simpson Strong-Drive DWP Wood SS screw 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 suitable for structural connections on permitted projects such as decks, docks, and boardwalks where engineered load data is required by inspectors or engineers of record.

What materials can the #14 x 3-1/2" DWP Wood SS screw be driven into?

The sharp point and box thread design of this fastener are engineered for use in wood, engineered wood products, and polymer materials. The specially designed tip penetrates hard wood products with ease, making it effective across a broad range of exterior structural applications without the need for pre-drilling in many cases.

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

This screw uses a T27 6-Lobe drive, which requires a matching T27 6-lobe (Torx-style) bit. The 6-lobe interface provides a secure fit between the bit and the fastener head, reducing cam-out during installation, extending bit life, and making the driving process easier and more consistent compared to Phillips or square-drive alternatives.

Note: Product dimensions may differ from picture.