Simpson Strong-Drive DWP Wood Screw, #12 x 5", 316 Stainless Steel Flat Head by Simpson is a load-rated structural fastener engineered for deck, dock, boardwalk, and exterior construction where superior corrosion resistance and verified load performance are essential. Built from Type 316 stainless steel - a material known for its ability to withstand saltwater exposure, harsh coastal environments, and chemically aggressive conditions - this flat-head wood screw delivers reliable structural connections where standard fasteners would quickly fail. The sharp-point tip and unique box-thread design make it a preferred choice for installers working with wood, engineered wood, and polymer materials in high-moisture or seaside settings.

Key Features

• Type 316 stainless steel material - resists corrosion in saltwater, coastal, and chemically harsh environments, making it ideal for docks, boardwalks, and marine-adjacent deck structures where standard steel fasteners would corrode prematurely.
• Unique box-thread design with raised-ridge technology - greatly reduces driving torque so you can drive more screws per battery charge, improving productivity on large deck and dock projects.
• Specially designed sharp point - penetrates hard wood and engineered wood products with ease, minimizing pre-drilling requirements and speeding up installation.
• T27 6-lobe drive - provides a secure bit-to-fastener fit that reduces cam-out, results in easier driving, and extends bit life over the course of a project.
• Flat head profile with 0.435 in. head diameter - seats flush with the surface for a clean, professional finish on decking and structural exterior applications.
• Load-rated and ICC-ES AC233 tested - verified for shear, pull-through, and withdrawal resistance so structural connections meet engineered load specifications and inspection requirements.
• 5-inch length in a #12 diameter - provides deep, robust engagement into structural members for high-strength connections in thick deck framing and dock construction.

Why This Product

• Built for high-corrosion environments - Type 316 stainless steel is specifically suited for seaside, waterfront, and severe-exposure applications where standard zinc or galvanized fasteners would degrade, making this screw the right choice for docks, marinas, and coastal decks.
• Structural performance you can document - tested to ICC-ES acceptance criteria AC233 and load-rated for shear, pull-through, and withdrawal, this fastener supports engineered design specifications and can satisfy building inspection requirements for exterior structural connections.
• Reduces installer fatigue on large projects - the box-thread design's reduced driving torque means fewer battery changes and less physical strain when installing hundreds of screws on a deck or boardwalk job.
• Versatile across exterior wood applications - compatible with wood, engineered wood, and polymer materials, this fastener covers a wide range of exterior structural connection scenarios from residential decking to commercial dock construction near water.

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 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Approx. Count Per Lb: 29
• Country of Origin: Taiwan

Available Pack Options

• T12500WP1: 1 Lb (29) - includes (1) T27 6-lobe driver bit
• T12500WP5: 5 Lb (145) - includes (1) T27 6-lobe driver bit
• T12500WPB: 500 Pk - includes (2) T27 6-lobe driver bits

Approved Applications

• Deck construction and decking board attachment in exterior environments
• Dock and marina structural fastening near water
• Boardwalk and pedestrian pathway construction
• General exterior structural connections requiring load-rated fasteners
• Applications with high or severe corrosion exposure, including seaside and coastal environments
• Connections into wood, engineered wood, and polymer materials

Frequently Asked Questions

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

Type 316 stainless steel offers a higher level of corrosion resistance than standard stainless grades, making it well suited for docks, boardwalks, and decks near water or exposed to high and severe corrosion conditions. It resists the salt, moisture, and chemical exposure common in coastal and waterfront environments where other fastener materials would deteriorate.

Is this screw load-rated for structural use?

Yes. The Strong-Drive DWP Wood SS screw has been tested in accordance with ICC-ES acceptance criteria AC233 and is load-rated for shear, pull-through, and withdrawal resistance. This makes it appropriate for exterior engineered structural connections where documented load performance is required.

What drive bit does this screw require?

This screw uses a T27 6-lobe drive. The 6-lobe design provides a secure fit between the bit and the fastener head, reducing cam-out during installation and helping extend bit life over extended use on large projects.

What materials is this screw compatible with?

The Strong-Drive DWP Wood SS is designed for use with wood, engineered wood, and polymer materials in exterior structural applications. Its sharp point is designed to penetrate hard wood products, and its box-thread design reduces driving torque across compatible substrates.

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