The Simpson #7 x 3 in. Collated Trim-Head Screw in Type 305 Stainless Steel is built for deck, dock, and boardwalk installations where corrosion resistance and a clean finished surface matter most. Designed specifically for PVC and composite decking in marine or high-exposure environments, these sharp-point screws feature a low-profile trim-style head that sits inconspicuously on the decking surface - delivering a polished result that standard fastener heads cannot match. Curved collation and compatibility with the Simpson Strong-Tie Quik Drive PRO300SG2 auto-feed screw driving system make these screws a practical choice for high-volume fastening applications where consistent placement and installation speed are essential.

Key Features

• Trim-style head design - sits low and discreetly on the decking surface, producing a clean, finished look that reduces visual clutter on exposed deck boards
• Type 305 stainless steel material and finish - provides high-level corrosion resistance for reliable long-term performance in marine environments, near salt air, and other harsh outdoor conditions
• Sharp point - penetrates PVC and composite decking materials cleanly without pre-drilling, saving time and reducing surface damage during installation
• Curved collation format - engineered for seamless use with auto-feed screw driving systems, keeping fasteners feeding consistently during high-volume deck and boardwalk projects
• #2 square drive - reduces cam-out during driving, giving installers better bit engagement and more control with every fastener
• Box threads - designed to draw deck boards down firmly and securely, creating tight, stable connections between wood-to-wood or composite-to-framing assemblies
• Driver bit included in each box - gets installations started immediately without a separate bit purchase; replacement bit available under model BIT2S
• Compatible with the Simpson Strong-Tie Quik Drive PRO300SG2 - integrates directly with this auto-feed screw driving system or compatible attachment, significantly increasing installation speed across large decking projects

Why This Product

• Purpose-built for harsh outdoor environments - Type 305 stainless steel construction makes these fasteners a dependable choice for marine, waterfront, and high-moisture applications where standard steel screws would corrode and fail prematurely
• Cleaner deck surface with every install - the trim-style head is specifically designed to be less noticeable on decking, giving composite and PVC deck installations a refined, professional appearance without the bulky look of conventional screw heads
• Efficiency advantage for large-scale projects - curved collation and full compatibility with the Simpson Strong-Tie Quik Drive PRO300SG2 auto-feed system means faster, more consistent fastener placement across decks, docks, and boardwalks with less fatigue
• A complete fastening solution in one box - each box ships with a driver bit included, so installers have everything needed to get started on PVC decking, composite decking, or wood-to-wood fastening applications right away

Specifications

• Model Number (MPN): SSDTH3S
• Screw Size: #7
• Length: 3 in.
• Head Type: Trim Head
• Drive Type: #2 Square
• Thread Type: Box Threads
• Point Type: Sharp Point
• Collation Type: Curved
• Material: Type 305 Stainless Steel
• Finish: Type 305 Stainless Steel
• Package Quantity: 1,000
• Compatible Tool: Simpson Strong-Tie Quik Drive PRO300SG2

Approved Applications

• Dock and Boardwalk construction
• PVC decking installation in marine or high-exposure environments
• Composite decking installation in marine or high-exposure environments

What's Included

• 1,000 x Simpson SSDTH3S #7 x 3 in. Trim-Head Collated Screws (Type 305

Frequently Asked Questions

What auto-feed screw driving system is compatible with these collated screws?

The SSDTH3S is designed to install with the Simpson Strong-Tie Quik Drive PRO300SG2 auto-feed screw driving system or a compatible attachment. The curved collation format is specifically engineered for seamless use with this type of auto-feed system, making it well suited for high-volume deck, dock, and boardwalk installations.

Why is Type 305 stainless steel recommended for decking applications near water or salt air?

Type 305 stainless steel provides a high level of corrosion resistance, making these screws an appropriate choice for marine or high-exposure environments where PVC or composite decks are installed. Standard steel fasteners can corrode rapidly in such conditions, whereas Type 305 stainless steel holds up significantly better against moisture, salt air, and other harsh elements.

Do these screws require pre-drilling before installation?

No pre-drilling is required. The SSDTH3S features a sharp point designed for fast, self-starting penetration, allowing the screw to drive directly into the decking material without the need for a pilot hole.

Is a driver bit included, and what type of drive does this screw use?

Yes, each 1,000-piece box includes one driver bit so you can begin installation immediately. These screws use a #2 square drive. If you need a replacement bit, the compatible model is BIT2S.