Simpson Strong-Drive DWP Wood Screw - #14 x 4" Flat Head in Type 316 Stainless Steel is a load-rated structural fastener engineered for exterior connections where corrosion protection and verified performance matter most. Designed for demanding environments like docks, boardwalks, and decks near water, this flat-head wood screw delivers certified shear, pull-through, and withdrawal resistance - making it a reliable choice wherever exposure to high or severe corrosion is a concern. Tested in accordance with ICC-ES acceptance criteria AC233, these screws bring structural confidence to every fastening point.

Key Features

• Type 316 Stainless Steel material - provides superior corrosion resistance compared to standard stainless grades, making it ideal for seaside, marine, and wet exterior environments where saltwater and harsh conditions are present.
• Unique box thread design with raised-ridge technology - greatly reduces driving torque so you can drive more screws per battery charge, improving jobsite efficiency and reducing tool fatigue.
• Specially designed sharp point - penetrates hardwood and dense materials with ease, eliminating the need for pre-drilling in many applications and speeding up installation.
• T27 6-Lobe drive - provides a secure, snug bit fit that results in easy, controlled driving and extended bit life, reducing cam-out and bit replacement costs.
• Flat head profile with 0.460" head diameter - sits flush with the surface for a clean, professional finish on decks, docks, and structural exterior connections.
• ICC-ES AC233 load-rated for shear, pull-through, and withdrawal - gives engineers, inspectors, and contractors verified performance data needed for code-compliant structural connections.
• Compatible with wood, engineered wood, and polymer materials - offers flexibility across a wide range of exterior structural applications without sacrificing performance.

Why This Product

• Built for high-corrosion environments - Type 316 stainless steel is the recommended choice for seaside, coastal, and waterfront applications where standard finishes quickly degrade. This screw is specifically formulated to withstand severe exposure conditions.
• Structural load ratings you can document - tested to ICC-ES acceptance criteria AC233, these fasteners provide verified shear, pull-through, and withdrawal values that support engineering specifications and permit approvals for decks, docks, and boardwalks.
• Engineered for torque efficiency - the box thread design with raised-ridge technology reduces driving torque, which means faster installation with less battery drain - a practical advantage on large exterior projects.
• A purpose-built screw for exterior structural connections - this is not a general-purpose fastener. Every design element - the sharp point, box threads, flat head, and 316 SS material - is selected for performance in demanding outdoor structural applications near water or in corrosive conditions.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #14
• Length: 4 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: 26
• Country of Origin: Taiwan

Available Pack Options

• T14400WP1: 1 Lb (26) - includes (1) T27 6-lobe driver bit
• T14400WP5: 5 Lb (130) - includes (1) T27 6-lobe driver bit
• T14400WPB: 700 Pk - includes (2) T27 6-lobe driver bits

Frequently Asked Questions

What makes Type 316 stainless steel the right choice for dock and deck fasteners?

Type 316 stainless steel offers enhanced resistance to corrosion from saltwater, moisture, and harsh outdoor chemicals compared to lower-grade finishes. Simpson specifically recommends Type 316 stainless steel for seaside and waterfront applications where screws are exposed to high or severe corrosion over time.

Are these screws structurally rated, and what test standard do they meet?

Yes. The Strong-Drive DWP Wood SS flat-head screws are structural fasteners that have been tested in accordance with ICC-ES acceptance criteria AC233. They carry load ratings for shear, pull-through, and withdrawal resistance - making them suitable for code-referenced structural exterior connections.

What materials can these screws be driven into?

The DWP Wood SS screw is compatible with wood, engineered wood, and polymer materials. The sharp point is designed to penetrate hard wood products with ease, and the box thread design reduces driving torque across these material types.

What bit does the T27 6-Lobe drive require?

These screws use a T27 6-Lobe (Torx-style) drive. The 6-lobe configuration provides a secure bit-to-screw fit that reduces cam-out during driving, resulting in easier installation and longer bit life compared to traditional Phillips or square drives.

Note: Product dimensions may differ from picture.