The Simpson Deck-Drive DWP #10 x 4-1/2 in. Type 316 Stainless Steel Wood Screw is a professional-grade fastening solution from Simpson engineered for deck boards, docks, boardwalks, railing assemblies, fascia, trim, and general exterior wood applications where severe-level corrosion resistance is essential. Built from Type 316 stainless steel and featuring a uniquely designed box-thread system, this flat-head screw delivers efficient, reliable performance across a wide range of outdoor and marine wood fastening projects.

Key Features

• Type 316 stainless steel construction - provides severe-level corrosion resistance for long-lasting performance in harsh outdoor, coastal, and marine environments where moisture and salt air are constant concerns.
• Unique box-thread design with raised-ridge technology - greatly reduces driving torque so you can drive more screws on a single battery charge, saving time and extending tool battery life on large installations.
• Specially designed sharp point - penetrates hard wood products with ease, eliminating the need for pre-drilling in most hardwood decking applications and streamlining the fastening process.
• T25 6-lobe drive - helps prevent driver-bit cam-out during installation, resulting in easier, more controlled driving and longer bit life on the job.
• Flat head profile - sits flush with the wood surface for a clean, finished appearance on deck boards, fascia, and trim; a trim-head version is also available.
• T25 6-lobe driver bit included - gets you started right out of the box; replacement bits are available under model BIT25T-2-R2 when needed.
• Versatile 4-1/2 in. length - suited for wood-to-wood fastening across a range of exterior applications including deck boards, guard rail posts, railing infill, and deck framing connections.

Why This Product

• Built for the harshest outdoor conditions - Type 316 stainless steel delivers severe-level corrosion resistance, making these screws a dependable choice for marine, dock, and coastal deck projects where inferior fasteners corrode and fail prematurely.
• Engineered to work harder on a single charge - the box-thread design with raised-ridge technology reduces driving torque significantly, meaning fewer battery swaps and faster completion on large-scale decking and dock installations.
• Broad application versatility - from deck boards and boardwalks to guard rail posts, railing infill, fascia, and trim, this screw is sized and designed to handle the full range of common exterior wood fastening tasks in a single product.
• Fewer installation headaches - the sharp point, cam-out-resistant 6-lobe drive, and included T25 driver bit work together to reduce bit slippage, eliminate pre-drilling in most hardwoods, and keep the installation process moving efficiently from start to finish.

Specifications

• MPN: T10450WPCM
• Brand: Simpson Strong-Tie
• Screw Size: #10
• Length: 4-1/2 in.
• Head Type: Flat Head
• Head Diameter: 0.365 in.
• Drive Type: T25 6-Lobe
• Thread Type: Box Threads
• Point Type: Sharp Point
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Quantity: 1,000

Approved Applications

• Fastening Wood-to-Wood
• Deck, dock, and general exterior applications
• Fascia and trim fastening

What's Included

• (1) T25 6-lobe driver bit

Frequently Asked Questions

What makes Type 316 stainless steel the right choice for outdoor and coastal applications?

Type 316 stainless steel provides severe-level corrosion resistance, making these screws well-suited for deck, dock, and exterior applications where exposure to moisture, salt air, and harsh environmental conditions is a concern.

How does the box-thread design benefit the user during installation?

The unique "box" thread design with raised-ridge technology greatly reduces driving torque, which allows you to drive more screws on a single battery charge compared to conventional thread designs - saving time and extending tool battery life on larger projects.

Does this screw require pre-drilling into hardwood?

No. The specially designed sharp point penetrates hard wood products with ease, eliminating the need for pre-drilling in most hardwood decking applications and streamlining the installation process.

What driver bit is compatible with this screw, and is one included?

These screws use a T25 6-lobe drive, which helps prevent driver-bit cam-out for easier driving and longer bit life. One T25 6-lobe driver bit is included with the 1,000-count box. The replacement bit model is BIT25T-2-R2.

Note: Product dimensions and/or thread length may differ from picture.