The Simpson T4PTDB Preservative-Treated Wood Decking Nail is a heavy-duty exterior fastener engineered by Simpson for deck boards, docks, and boardwalk construction. Built from Type 316 stainless steel and designed with an annular ring shank, this 4d, 1 1/2 in. nail delivers the corrosion resistance and holding power that outdoor structural connections demand - keeping your decking tight, flush, and protected through years of exposure to moisture, weather, and the chemicals inherent in preservative-treated lumber.

Key Features

• Type 316 stainless steel material - provides severe-level corrosion resistance, making this nail well suited for the harshest outdoor environments including docks and coastal deck applications where moisture and treated-wood chemistry accelerate fastener degradation.
• Annular ring shank - increases withdrawal resistance so nail heads stay flush with the decking surface over time, reducing the risk of popped nails and costly maintenance callbacks.
• Larger 0.113 in. shank diameter - penetrates both green and seasoned preservative-treated pine with confidence, giving builders flexibility across different lumber conditions on the same project.
• Checkered head pattern - blends with natural wood grain and reduces glare from sunlight, delivering a cleaner finished appearance on exposed deck and dock surfaces.
• Diamond point - eases driving into dense treated lumber, reducing split risk and improving installation speed.
• Full round head with 1/4 in. head diameter - distributes clamping force across a wider surface area for a secure, lasting connection in deck board fastening.
• 12-gauge steel construction - provides the shank strength needed to handle the structural demands of deck and dock framing without bending or deflecting during installation.
• 25 lb. package quantity (approx. 228 nails per lb.) - supplies enough fasteners for large-scale decking projects, reducing the need for frequent reordering mid-job.

Why This Product

• Purpose-built for preservative-treated wood - the combination of a larger shank diameter and diamond point means this fastener drives cleanly into both freshly treated and dried preservative-treated pine without pre-drilling, saving time on deck and dock installations.
• Severe-level corrosion resistance where it matters most - Type 316 stainless steel stands up to the chemical compounds found in treated lumber as well as ongoing moisture and weather exposure, protecting the integrity of your outdoor structure long after installation.
• Designed to stay put - the annular ring shank locks into wood fibers with significantly higher withdrawal resistance than smooth-shank nails, meaning deck boards remain tight and nail heads stay flush through seasonal wood movement and heavy foot traffic.
• Professional finish built into the head - the checkered pattern does double duty by providing grip during driving and blending visually with wood grain on the finished surface, making it a smart choice for deck builders who care about both performance and appearance.

Specifications

• Model Number: T4PTDB
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Gauge: 12
• Penny Size: 4d
• Length: 1-1/2 in.
• Head Type: Full Round Head
• Head Pattern: Checkered