The Simpson 7d x 2-1/4 in. Annular Ring Shank Box Nail in Type 304 Stainless Steel is a professional-grade fastener built for construction applications where corrosion resistance and superior holding power are non-negotiable. Featuring a 12-gauge annular ring shank and a full round checkered head, these nails are engineered for permanent wood foundation construction, exterior framing, decking, siding, and trim work exposed to moisture and weather. Produced domestically and supplied in a 25 lb bulk package, they meet the demands of projects where both fastener integrity and long-term performance are required.

Key Features

• Type 304 Stainless Steel Construction - Delivers excellent corrosion resistance in moisture-exposed and exterior environments, keeping connections secure over the long term without rust-related degradation.
• Annular Ring Shank - The ringed shank profile dramatically increases withdrawal resistance compared to smooth-shank nails, providing a stronger mechanical grip in wood for applications where pull-out forces are a concern.
• 12-Gauge Wire Diameter - Provides the structural thickness expected of a box nail while maintaining the shank flexibility needed to reduce splitting in dense or dry lumber.
• Full Round Checkered Head - The checkered head pattern reduces glare and improves surface finish acceptance, making these nails well-suited for visible exterior assemblies including decking and trim.
• Diamond Point Tip - Promotes clean, accurate nail driving with reduced wood splitting, improving efficiency and finish quality on the job site.
• Approved for Permanent Wood Foundation Construction - Meets the fastener requirements of ANSI/AF&PA Permanent Wood Foundations Design Specifications, giving builders a code-aligned choice for below-grade and moisture-critical applications.
• Made in the United States - Domestically produced to consistent quality standards, supporting supply chain confidence on commercial and residential projects alike.

Why This Product

• Built for high-moisture and exterior environments - Type 304 Stainless Steel resists corrosion where standard galvanized or bright nails would fail, making these fasteners a reliable long-term choice for decking, siding, exterior framing, and permanent wood foundations.
• Superior withdrawal resistance by design - The annular ring shank mechanically locks into wood fiber, holding significantly better than smooth-shank alternatives - a critical advantage in structural assemblies and foundation work where fastener pull-out is a real load concern.
• Specification-ready for permanent wood foundation projects - These nails are aligned with ANSI/AF&PA Permanent Wood Foundations Design Specifications, reducing the guesswork when selecting fasteners for code-sensitive or engineer-reviewed construction.
• 25 lb bulk supply from a trusted fastener brand - Simpson is a widely recognized name in structural fasteners, and the bulk format keeps production moving on larger framing, decking, or foundation projects without frequent restocking interruptions.

Specifications

• Model Number: S7ABNB
• Coating / Material: Type 304 Stainless Steel
• Gauge: 12
• Penny Size: 7d
• Length: 2-1/4 in.
• Head Diameter: 1/4 in.
• Shank Diameter: 0.113 in.
• Shank Type: Annular-Ring Shank
• Head Type: Full Round Head
• Head Pattern: Checkered
• Point Type: Diamond Point
• Package Quantity: 25 Lb
• Country of Origin: United States

Approved Applications

• Permanent wood foundation construction per ANSI/AF&PA Permanent Wood Foundations Design Specifications
• Exterior wood framing and structural assemblies requiring corrosion-resistant fasteners
• Decking, siding, and trim applications exposed to moisture and weather
• Any construction environment where annular ring shank withdrawal resistance is specified or required
• Projects requiring checkered head nails for reduced glare and surface finish acceptance

What's Included

• Simpson S7ABNB 7d x 2-1/4" Annular Ring Shank Box Nails, Type 304 Stainless Steel - 25 Lb bulk package

Frequently Asked Questions

Why are these nails recommended for permanent wood foundations?

These nails are made from Type 304 stainless steel, which provides excellent corrosion resistance in moisture-exposed environments. The ANSI/AF&PA Permanent Wood Foundations Design Specification recommends stainless steel nails for the construction of permanent wood foundations, making these an appropriate choice for that application.

How does the annular ring shank improve performance compared to smooth-shank nails?

The annular ring shank dramatically increases withdrawal resistance compared to smooth-shank alternatives. This means the nail resists being pulled out of the wood substrate more effectively, resulting in a more secure and long-lasting attachment in structural and exterior assemblies.

What is the purpose of the checkered head pattern on these nails?

The checkered pattern on the full round head serves several practical purposes: it blends with wood grain for a cleaner appearance, reduces glare from sunlight, and accepts surface finishes, giving the finished assembly a more refined look.

What gauge are these nails, and how are they sold?

These are 12-gauge nails measuring 7d x 2-1/4" in length. They are sold in a 25 lb bulk quantity, making them well suited for larger construction projects where a significant volume of fasteners is needed.