Simpson 8d 0.120" x 2-1/2" Preservative-Treated Wood Decking Nail in Type 304 Stainless Steel is engineered by Simpson Strong-Tie for demanding outdoor fastening applications where corrosion resistance and long-term holding power are essential. Designed specifically for deck boards, docks, and boardwalks, this annular-ring shank nail drives cleanly into both green and seasoned preservative-treated pine, delivering the kind of withdrawal resistance that keeps decking surfaces flat and secure for years. Whether you are building a backyard deck or a waterfront dock, this stainless steel decking nail provides a powerful, corrosion-resistant fastening solution that helps your outdoor living space last as long as the interior of your home.

Key Features

• Type 304 Stainless Steel material - provides strong corrosion resistance in exterior and preservative-treated wood environments, helping the fastener maintain structural integrity over time in wet and outdoor conditions.
• Annular-ring shank design - significantly increases withdrawal resistance compared to smooth-shank nails, helping prevent nail heads from popping up over time and keeping deck boards tight against the framing.
• Larger 0.120" shank diameter at 11 gauge - allows for easier penetration into both green (freshly milled) and seasoned (dried) preservative-treated pine without splitting the wood.
• Full round head with checkered pattern - the 9/32" head diameter provides a solid bearing surface for maximum holding strength, while the checkered face blends with wood grain and reduces glare from sunlight for a cleaner finished appearance.
• Diamond point tip - promotes easier, more accurate driving into dense treated lumber, reducing installer effort and improving placement precision.
• 8d penny size at 2-1/2" length - a standard sizing for deck board fastening, compatible with common decking board thicknesses and framing configurations.
• Made in the United States - manufactured domestically to Simpson Strong-Tie quality standards, supporting consistent performance across deck and dock projects.

Why This Product

• Built for preservative-treated wood specifically - the annular-ring shank and larger 0.120" shank diameter are engineered to handle the denser, more fibrous texture of treated pine, whether green or seasoned, so you spend less time fighting the material and more time building.
• Corrosion-resistant Type 304 stainless steel keeps fasteners looking and performing well outdoors - ideal for decks and dock structures exposed to moisture, humidity, and the chemicals present in preservative-treated lumber.
• Increased withdrawal resistance means fewer callbacks and a longer-lasting deck surface - the annular-ring shank actively grips the wood fibers, resisting the natural movement and swelling cycles of outdoor decking that cause smooth-shank nails to loosen over time.
• Approved for both deck board and dock applications - a single fastener solution for two of the most common exterior wood structures, simplifying material selection for contractors and homeowners alike.

Specifications

• Brand: Simpson Strong-Tie
• Material: Type 304 Stainless Steel
• Finish: Type 304 Stainless Steel
• Penny Size: 8d
• Length: 2-1/2 in.
• Gauge: 11
• Shank Diameter: 0.120 in.
• Head Diameter: 9/32 in.
• Shank Type: Annular-Ring Shank
• Head Type: Full Round Head
• Head Pattern: Checkered
• Point Type: Diamond Point
• Approx. Count per Lb: 115
• Country of Origin: United States

Available Pack Options

• S8PTD1: 1 Lb (115)
• S8PTD5: 5 Lb (575)
• S8PTDB: 25 Lb (2875)

Approved Applications

• Decks - Deck Boards Wood
• Dock and Boardwalk

Frequently Asked Questions

Why use an annular-ring shank nail instead of a smooth-shank nail for decking?

The annular-ring shank has circular ridges along the shaft that grip wood fibers as the nail is driven in, providing increased withdrawal resistance compared to a smooth-shank nail. In outdoor decking applications, wood expands and contracts with moisture and temperature changes. The ring shank resists the forces that push smooth nails back out over time, helping keep deck boards flat and preventing nail heads from popping above the surface.

Is Type 304 stainless steel appropriate for use with preservative-treated lumber?

Yes. Type 304 stainless steel provides strong corrosion resistance that is compatible with preservative-treated wood for most deck and dock applications. The material resists the corrosive chemicals found in treated lumber and withstands the outdoor moisture exposure typical of decking environments. For seaside or coastal applications with higher salt exposure, Simpson recommends considering Type 316 stainless steel for superior corrosion resistance.

Can this nail be used in both green and seasoned preservative-treated pine?

Yes. This decking nail features a larger 0.120" shank diameter specifically designed to allow easy installation into both green (freshly milled, higher moisture content) and seasoned (dried) preservative-treated pine. The diamond point also aids in penetration, making driving easier regardless of whether the lumber has been recently treated or has had time to dry.

What does the checkered head pattern on this nail do?

The checkered pattern on the full round head serves two practical purposes: it blends visually with the wood grain for a cleaner finished appearance, and it reduces glare from sunlight that a polished smooth head might produce. The 9/32" head diameter also ensures a solid bearing surface that resists pull-through for reliable long-term holding in deck board fastening.

Note: Product dimensions may differ from picture.