Simpson Deck-Drive DWP Wood Screw in Type 305 Stainless Steel is a high-performance fastening solution engineered for decking, dock construction, and general exterior wood applications where long-term corrosion resistance is essential. Featuring a trim head profile, T20 6-lobe drive, sharp point, and unique box thread design, this #9 x 3-1/2" screw drives cleanly into the widest range of deck board materials - from solid wood to engineered lumber - while delivering the holding power and weather resistance exterior projects demand.

Key Features

• Type 305 Stainless Steel material - provides robust corrosion resistance for outdoor, dockside, and wet-environment applications where standard coated fasteners may fail prematurely
• Unique box thread design with raised-ridge technology - greatly reduces driving torque so installers can drive more screws per battery charge, improving job-site efficiency
• Specially designed sharp point - penetrates hardwood deck boards and dense exterior lumber with ease, reducing the need for pre-drilling and speeding up installation
• T20 6-lobe drive - delivers a secure, stable bit engagement that minimizes cam-out, extends bit life, and keeps drives smooth even in demanding conditions
• Trim head profile (0.250 in. head diameter) - sits low and discreet on the surface for a clean, finished appearance on fascia boards, millwork, and trim applications
• Compatible with wood, engineered wood, and polymer materials - versatile enough for the full range of modern deck board products, including composite and engineered lumber
• 3-1/2" length - provides the depth of penetration needed for secure fastening through typical deck board thicknesses into structural framing below

Why This Product

• Built for exterior environments that demand real corrosion protection - Type 305 stainless steel construction stands up to moisture, humidity, and outdoor exposure where standard zinc-coated fasteners would corrode and stain surrounding wood over time
• Engineered to reduce installer fatigue on large decking projects - the box thread geometry lowers driving resistance, meaning fewer battery changes and less physical effort across an entire deck installation or boardwalk project
• Trim head design makes it the right choice for finish work - the low-profile 0.250 in. head recesses cleanly for use on fascia, millwork, and trim where a visible bulky fastener head is unacceptable
• One screw handles multiple exterior applications - deck boards, docks, boardwalks, fascia, and trim can all be fastened with this single fastener type, simplifying material ordering and keeping job sites organized

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #9
• Length: 3-1/2 in.
• Material: Type 305 Stainless Steel
• Finish: Type 305 Stainless Steel
• Head Type: Trim Head
• Head Diameter: 0.250 in.
• Drive Type: T20 6-Lobe
• Thread Type: Box Threads
• Point Type: Sharp Point
• Approx. Count Per Lb.: 70
• Color: None
• Country of Origin: Taiwan

Available Pack Options

• S09350WP1: 1 Lb - includes (1) T20 6-lobe driver bit
• S09350WP5: 5 Lb - includes (1) T20 6-lobe driver bit
• S09350WPB: 1500 Pk - includes (2) T20 6-lobe driver bits

Approved Applications

• Decking - fastening deck boards to structural framing in residential and commercial deck construction
• Docks and boardwalks - corrosion-resistant performance in high-moisture and waterfront environments
• Fascia and trim - trim head profile provides a low-profile, finished look on exterior fascia boards
• Millwork and finishing - suitable for exterior millwork and architectural trim where appearance and durability both matter
• General exterior wood applications - compatible with wood, engineered wood, and polymer deck board materials

Frequently Asked Questions

What type of wood and materials can the Deck-Drive DWP Wood Screw be used with?

The DWP Wood Screw is designed for use with wood, engineered wood, and polymer materials, making it suitable for the wide range of deck board products used in modern decking, dock, and boardwalk construction, as well as exterior trim and fascia applications.

Why does this screw use a box thread design instead of a standard thread?

The unique box thread design with raised-ridge technology is engineered to greatly reduce driving torque compared to standard thread profiles. This means less resistance when driving each screw, which conserves battery power and allows installers to drive more screws per charge during large-scale decking or exterior projects.

Is Type 305 stainless steel suitable for all outdoor and coastal environments?

Type 305 stainless steel provides strong corrosion resistance for deck, dock, and general exterior applications. For seaside and coastal environments with direct saltwater exposure, Type 316 stainless steel is the recommended choice for maximum corrosion protection.

What is the purpose of the trim head profile on this screw?

The trim head features a small 0.250 in. head diameter that sits low and discreet on the material surface. This makes the DWP especially well-suited for fascia boards, exterior millwork, and trim applications where minimizing fastener visibility and achieving a clean, finished appearance are priorities.

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