Simpson Strong-Drive DWP Wood Screw, #12 x 6", Type 316 Stainless Steel Flat Head by Simpson is a load-rated structural fastener engineered for deck, dock, boardwalk, and general exterior applications where exposure to moisture, saltwater, or severe corrosion demands more than standard hardware can deliver. Built from Type 316 stainless steel - the same alloy trusted in marine and coastal environments - this flat-head wood screw delivers verified shear, pull-through, and withdrawal resistance backed by ICC-ES acceptance criteria AC233, making it a code-compliant choice for demanding structural connections near water or in high-humidity conditions.

Key Features

• Type 316 Stainless Steel material - provides superior corrosion resistance compared to standard stainless grades, making it well-suited for seaside structures, saltwater-exposed docks, and wet outdoor environments where rust or degradation would compromise structural integrity.
• Unique box thread design - significantly reduces driving torque so installers can drive more fasteners per battery charge, improving productivity on large deck or dock projects.
• Specially designed sharp point - penetrates hardwood, engineered wood, and polymer materials without pre-drilling, speeding up installation and reducing labor on tough substrates.
• T27 6-Lobe drive - creates a secure, slip-resistant bit engagement that minimizes cam-out, extends bit life, and results in cleaner, easier drives even in demanding structural applications.
• Flat head profile with 0.435" head diameter - sits flush with the surface for a clean, professional finish on decks and boardwalks where aesthetics and smooth walking surfaces matter.
• ICC-ES AC233 tested and load-rated - verified for shear, pull-through, and withdrawal resistance so engineers and contractors can use published load values with confidence in structural designs.
• 6" length - provides deep penetration for strong, long-lasting connections in thick lumber or multi-layer structural assemblies common on docks and heavy-duty exterior framing.

Why This Product

• Built specifically for severe corrosion environments - Type 316 stainless steel is the go-to material for coastal, marine, and waterfront applications where standard zinc or 304-grade fasteners would corrode and fail prematurely, threatening structural safety.
• Load-rated and code-compliant - tested under ICC-ES AC233 with published values for shear, pull-through, and withdrawal, this screw gives contractors and engineers the documentation they need for permitted structural work on docks, decks, and boardwalks.
• Reduces installer fatigue and tool wear - the box thread's low-torque design and the 6-lobe drive's positive bit engagement work together to make high-volume fastening jobs faster and easier, with less strain on batteries and bits.
• Versatile across exterior structural materials - compatible with wood, engineered wood, and polymer materials, this screw handles the range of substrates found in modern deck and dock construction without requiring multiple fastener types on the job.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #12
• Length: 6 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: 24
• Country of Origin: Taiwan

Available Pack Options

• T12600WP1: 1 Lb (24) - includes (1) T27 6-lobe driver bit
• T12600WP5: 5 Lb (120) - includes (1) T27 6-lobe driver bit
• T12600WPB: 600 Pk - includes (2) T27 6-lobe driver bits

Approved Applications

• Deck construction and decking fastening in exterior environments
• Dock and marina structures exposed to water and high corrosion
• Boardwalk framing and structural connections near water
• General exterior structural connections requiring corrosion protection
• Applications requiring ICC-ES AC233 load-rated fasteners
• Wood, engineered wood, and polymer material assemblies
• Seaside and coastal construction where severe corrosion resistance is required

Frequently Asked Questions

Why choose Type 316 stainless steel over other finishes for this screw?

Type 316 stainless steel offers enhanced resistance to chlorides and harsh chemicals compared to standard 304 stainless, making it the preferred choice for dock, marina, and coastal deck applications where exposure to saltwater or severe moisture would corrode lesser materials over time. Simpson specifically designates this grade for seaside applications.

What does ICC-ES AC233 testing mean for this screw, and why does it matter?

ICC-ES acceptance criteria AC233 is a recognized structural evaluation standard for wood screws. The Strong-Drive DWP Wood SS screw has been tested and load-rated under this criteria for shear, pull-through, and withdrawal resistance. This means engineers and contractors can reference published load values and use this fastener with confidence in permitted structural designs for decks, docks, and similar exterior assemblies.

Do I need to pre-drill when using the #12 x 6" DWP screw in hardwood or engineered wood?

The specially designed sharp point on the Strong-Drive DWP Wood SS screw is engineered to penetrate hard wood products, engineered wood, and polymer materials without the need for pre-drilling in typical applications, helping to speed up installation and reduce labor on deck and dock projects.

What drive bit should I use with this screw?

This screw uses a T27 6-Lobe drive. The 6-lobe profile provides a secure, positive fit between the bit and the fastener head, which minimizes cam-out during driving, reduces bit wear, and makes for a smoother, more controlled installation - particularly useful during high-volume fastening on large deck or dock projects.

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