Simpson Deck-Drive DWP Wood Screw in Type 316 Stainless Steel (#10 x 3-1/2", T25 Flat Head) by Simpson is a high-performance fastening solution engineered for decks, docks, boardwalks, and general exterior woodworking where superior corrosion resistance is essential. Featuring a sharp point and proprietary box-thread design, this stainless steel wood screw drives cleanly through a wide range of solid wood, engineered wood, and polymer materials without pre-drilling. The Type 316 stainless steel construction makes it especially well-suited for seaside and coastal environments where saltwater exposure and harsh outdoor conditions demand maximum rust resistance.

Key Features

• Type 316 stainless steel material - provides elevated resistance to saltwater, chlorides, and coastal atmospheric conditions, making it an ideal fastener for docks, seaside decks, and other marine-adjacent structures.
• Unique box-thread design with raised-ridge technology - significantly reduces driving torque so you can drive more screws per battery charge, improving efficiency and reducing installer fatigue on large deck projects.
• Specially designed sharp point - penetrates hardwood and dense composite materials with ease, eliminating the need for pilot holes and speeding up installation.
• T25 6-lobe drive - delivers a secure, tight bit fit that minimizes cam-out, extends bit life, and produces a cleaner, more consistent drive result on every fastener.
• Flat head profile (0.335 in. head diameter) - sits flush with the surface of deck boards and trim for a clean, professional finish that avoids snag points underfoot.
• 3-1/2 in. length with #10 screw size - provides deep, reliable penetration into framing members through standard deck board thickness, ensuring a secure, long-lasting hold.
• Compatible with wood, engineered wood, and polymer materials - versatile enough for decking, fascia, trim, and millwork applications so one fastener type handles multiple tasks on a job site.

Why This Product

• Built for corrosive environments - Type 316 stainless steel goes beyond standard stainless grades to resist the chloride-rich air and moisture found in coastal and waterfront settings, keeping fasteners intact season after season.
• Designed to reduce wear on tools and workers - the box-thread geometry lowers driving resistance, which translates directly to longer battery runtime, less bit replacement, and less strain on the installer during full-day deck builds.
• Suited for today's deck board materials - the sharp point and box-thread combination is specifically optimized for the hardwoods, engineered wood composites, and polymer materials commonly used in modern decking, reducing splitting and surface damage.
• A single screw for multiple exterior applications - from structural decking and dock planking to fascia, trim, and millwork finishing, this fastener handles a broad range of outdoor wood-to-wood connections in one consistent specification.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #10
• Length: 3-1/2 in.
• Head Type: Flat Head
• Head Diameter: 0.335 in.
• Drive Type: T25 6-Lobe
• Thread Type: Box Threads
• Point Type: Sharp Point
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Color: None
• Approx. Count per Lb.: 56
• Country of Origin: Taiwan

Available Pack Options

• T10350WP1: 1 Lb - includes (1) T25 6-lobe driver bit
• T10350WPP: 250 Pk - includes (1) T25 6-lobe driver bit
• T10350WPB: 1000 Pk - includes (2) T25 6-lobe driver bits

Approved Applications

• Decking - fastening deck boards to framing in residential and commercial outdoor deck construction
• Docks and boardwalks - corrosion-resistant fastening in waterfront and marine structures
• Fascia and trim - securing exterior finishing boards and millwork to framing
• General exterior applications - wood, engineered wood, and polymer material fastening where extra corrosion protection is required

Frequently Asked Questions

Why is Type 316 stainless steel recommended for coastal and seaside deck projects?

Type 316 stainless steel contains a higher molybdenum content than standard 304 stainless, which gives it enhanced resistance to chlorides, saltwater, and the corrosive atmospheric conditions found near oceans and waterways. This makes the DWP Wood SS screw a reliable choice for docks, boardwalks, and seaside decks where standard fasteners would corrode prematurely.

What types of wood and decking materials can this screw be used with?

The Deck-Drive DWP Wood SS screw is designed for use with solid wood, engineered wood, and polymer materials, making it compatible with the wide range of deck boards, fascia, and trim products commonly used in modern exterior construction and renovation projects.

What bit is required to drive this screw?

This screw uses a T25 6-lobe drive. The 6-lobe geometry provides a secure bit-to-fastener fit that reduces cam-out during driving, extends bit life, and helps produce a consistent, flush finish across the deck surface.

Does this screw require pre-drilling?

The DWP Wood SS screw features a specially designed sharp point that is intended to penetrate hardwood and dense deck board materials without a pilot hole. The box-thread design also reduces driving torque, allowing the fastener to seat fully with less effort and without pre-drilling in most standard decking applications.

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