Simpson Strong-Tie 12d x 3-1/4" Preservative-Treated Wood Decking Nail in Type 304 Stainless Steel is engineered for long-lasting performance in outdoor deck and dock construction. Built with a 9-gauge annular-ring shank and full round head, this exterior fastener is purpose-designed to grip firmly into both green and seasoned preservative-treated pine - delivering the corrosion resistance and withdrawal strength that exterior wood projects demand. Whether you are building a backyard deck or a waterfront dock, this stainless steel decking nail provides a reliable, professional-grade connection that holds up against the elements over time.

Key Features

• Type 304 Stainless Steel material - provides strong corrosion resistance in outdoor and pressure-treated lumber environments, helping to extend the life of your deck or dock structure
• Annular-ring shank - increases withdrawal resistance compared to smooth-shank nails, reducing the chance of nail heads popping up over time in high-movement decking applications
• Larger 0.148" shank diameter (9 gauge) - enables easier penetration into both green and seasoned preservative-treated pine without requiring excessive driving force
• Full round head with checkered pattern - the 5/16" diameter head blends naturally with wood grain texture and reduces glare from direct sunlight for a cleaner finished appearance
• Diamond point tip - promotes easier, straighter driving into dense treated lumber, reducing splitting and improving installation speed
• 12d penny size at 3-1/4" length - sized appropriately for standard decking board thickness, delivering solid penetration depth into the framing below
• Made in the United States - domestic manufacturing supports consistent quality standards for a critical structural fastening application

Why This Product

• The annular-ring shank design directly addresses one of the most common decking problems - nail pop - by dramatically increasing withdrawal resistance so fasteners stay flush with the surface season after season
• Type 304 stainless steel construction makes this nail a dependable choice for exterior applications where standard galvanized fasteners may corrode prematurely when in contact with modern preservative-treated lumber chemicals
• The checkered full round head pattern blends with deck board surface texture, giving finished decks a cleaner, more professional look compared to smooth-head alternatives
• At 9 gauge with a diamond point, this nail is sized and shaped to drive cleanly through dense treated pine without excessive pre-drilling or board splitting - saving time during installation

Specifications

• Brand: Simpson Strong-Tie
• Penny Size: 12d
• Length: 3-1/4 in.
• Gauge: 9
• Shank Diameter: 0.148 in.
• Shank Type: Annular-Ring Shank
• Head Type: Full Round Head
• Head Diameter: 5/16 in.
• Head Pattern: Checkered
• Point Type: Diamond Point
• Material/Finish: Type 304 Stainless Steel
• Approximate Count Per Lb: 60
• Country of Origin: United States

Available Pack Options

• S12PTD1: 1 Lb (60)
• S12PTD5: 5 Lb (300)
• S12PTDB: 25 Lb (1500)

Frequently Asked Questions

What type of wood is this decking nail designed to be used with?

This nail is specifically designed for use with preservative-treated pine in deck and dock applications. The larger 9-gauge shank diameter and annular-ring shank allow it to penetrate and grip both green (freshly treated) and seasoned (dried) preservative-treated pine effectively.

Why choose Type 304 stainless steel for a decking nail?

Type 304 stainless steel provides strong corrosion resistance, making it well-suited for outdoor decking and dock projects where fasteners are exposed to moisture and the chemicals found in modern preservative-treated lumber. For seaside applications or environments with higher salt exposure, Type 316 stainless steel is recommended for superior corrosion resistance.

What is an annular-ring shank and why does it matter for decking?

An annular-ring shank features ridges along the shank of the nail that act like threads, dramatically increasing the nail's withdrawal resistance compared to a smooth shank. In decking applications, this means the nail holds more firmly in the wood as boards expand and contract with seasonal changes, reducing the likelihood of nail heads popping up above the deck surface over time.

Is the checkered head pattern purely cosmetic or does it serve a function?

The checkered pattern on the full round head serves two practical purposes: it blends with the natural wood grain texture of the decking surface for a cleaner finished appearance, and it reduces glare from sunlight reflecting off a smooth metal surface - both of which improve the look of the finished deck.

Note: Product dimensions may differ from picture.