Simpson 20d Decking Nail 4 in. x.203 in. 316 SS Ring Shank Preservative-Treated Wood by Simpson is an exterior fastener engineered for deck and dock construction where long-term holding power and corrosion resistance are non-negotiable. Built from Type 316 stainless steel, this ring shank decking nail is purpose-built to perform in demanding outdoor environments, from backyard decks to waterfront docks and boardwalks, delivering a fastening solution that works as hard as the structure it holds together.

Key Features

• Annular ring shank design - increases withdrawal resistance to help prevent nail heads from popping up over time, keeping deck surfaces smooth and secure through seasons of expansion and contraction
• Type 316 stainless steel construction - provides severe-level corrosion resistance, making these nails well-suited for coastal, seaside, and other high-moisture environments where standard fasteners would quickly degrade
• Larger shank diameter (.203 in.) - allows the nail to easily penetrate both green and seasoned preservative-treated pine without splitting or stalling, reducing installation effort on treated lumber
• Diamond point tip - enables easier driving so installers can work faster and with less fatigue across large decking projects
• Checkered head pattern - blends with wood grain and reduces glare from sunlight, giving finished deck surfaces a cleaner, more natural appearance
• Full round head with 7/16 in. diameter - provides a broad bearing surface that seats flush and holds decking boards firmly without over-driving
• Ideal for decks and docks - approved specifically for deck board and boardwalk applications, so buyers can select with confidence for code-sensitive exterior projects

Why This Product

• Built to resist the harshest outdoor conditions - Type 316 stainless steel delivers severe-level corrosion resistance, making these nails a dependable choice for salt-air, waterfront, and high-humidity environments where fastener failure is a real risk
• Engineered specifically for preservative-treated lumber - the larger shank diameter and annular ring shank work together to drive cleanly into treated pine and grip it firmly over time, reducing the callbacks and repairs that come with generic fasteners in PT wood applications
• A finish that works with the wood, not against it - the checkered head pattern minimizes glare and blends with natural wood grain, so these nails contribute to a polished final look on visible decking surfaces rather than detracting from it
• Trusted brand, domestic production - Simpson is a recognized name in structural fasteners, and these nails are made in the United States, offering buyers confidence in consistent quality and material standards for professional and serious DIY deck projects alike

Specifications

• Model Number: T20HPTDB
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Gauge: 6
• Penny Size: 20d
• Length: 4 in.
• Head Type: Full Round Head
• Head Diameter: 7/16 in.
• Head Pattern: Checkered
• Shank Type: Annular-Ring Shank
• Shank Diameter: 0.203 in.
• Point Type: Diamond Point
• Package Quantity: 25 lb. (approx. 25 nails per lb.)
• Country of Origin: United States

Approved Applications

• Dock and Boardwalk

Note: Product dimensions may differ from picture.