The Simpson SSDTH3S #7 x 3 in. Trim-Head Collated Screw is engineered for clean, professional-looking deck installations in marine and high-exposure environments. Crafted from Type 305 stainless steel, these screws deliver superior corrosion resistance, making them an ideal choice wherever PVC or composite decking is installed near water, salt air, or other harsh conditions. The distinctive trim-style head sits low and inconspicuously on the decking surface, producing a refined, finished appearance that standard screw heads simply cannot match. Designed for use with curved collation and a #2 square drive, the SSDTH3S is fully compatible with the Simpson Strong-Tie Quik Drive PRO300SG2 auto-feed screw driving system, dramatically increasing installation speed on large deck, dock, and boardwalk projects. Each 1,000-piece box includes a driver bit, so you can get to work straight out of the box.

Key Features

• Trim-style head is less noticeable on the decking surface and offers a clean, finished look
• Type 305 stainless steel provides high-level corrosion resistance - ideal for marine and high-exposure environments
• Curved collation for seamless use with auto-feed screw driving systems
• #2 square drive for positive bit engagement and reduced cam-out
• Box threads for strong holding power in composite and PVC decking materials
• Sharp point for fast, self-starting penetration without pre-drilling
• 3 in. length provides deep, secure fastening through decking into substructure
• Driver bit included in each box; replacement bit model BIT2S
• 1,000-piece quantity - bulk packaging for large decking projects
• Compatible with the Simpson Strong-Tie Quik Drive PRO300SG2 auto-feed screw driving system or attachment

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
• Country of Origin: Taiwan

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.