Simpson 12d x 3-1/4" Annular Ring Shank Box Nail in 304 Stainless Steel is a professional-grade fastener engineered for demanding outdoor, marine-adjacent, and permanent wood foundation applications where corrosion resistance and superior holding power are essential. Manufactured by Simpson, this full round head box nail features an annular ring shank design that dramatically increases withdrawal resistance compared to smooth-shank alternatives, making it a trusted choice for contractors and builders who need a secure, long-lasting mechanical connection in wood framing, decking, and structural assemblies.

Key Features

• 304 Stainless Steel construction - delivers exceptional corrosion resistance in outdoor environments, humid conditions, and applications involving treated lumber, protecting the connection from rust and degradation over the life of the structure.
• Annular ring shank profile - the ringed shank mechanically locks into surrounding wood fibers, significantly increasing withdrawal resistance so fastened materials stay securely in place even under dynamic loads, swelling, and seasonal wood movement.
• Full round head with checkered pattern - the checker-textured head blends naturally with wood grain, reduces glare from sunlight, and accepts surface finishes so the finished appearance remains clean and professional.
• Diamond point tip - promotes clean, accurate nail driving with reduced wood splitting, saving time during installation and maintaining the integrity of the surrounding material.
• 10-penny (12d) sizing at 3-1/4" length - a widely specified nail size for structural framing and sheathing applications, ensuring compatibility with standard construction practices and code requirements.
• 0.131" shank diameter with 2/7" head diameter - the precise gauge and head size balance holding strength with a low-profile footprint, suitable for box nail applications where minimizing wood splitting is a priority.
• Recommended for permanent wood foundations - meets the fastener requirements referenced by the ANSI/AF&PA Permanent Wood Foundations Design Specifications, giving builders confidence in code-compliant installations.

Why This Product

• Purpose-built for corrosive environments - type 304 stainless steel resists rust, oxidation, and chemical attack, making this nail the right choice when galvanized fasteners are not adequate for the application or when long-term performance in wet or treated-lumber conditions is required.
• Holds tighter over time - the annular ring shank resists pullout forces that smooth-shank nails cannot, so connections remain firm as wood expands, contracts, and settles through seasonal cycles - a critical advantage in decking, siding, and foundation work.
• Finish-friendly head design - the checkered full round head accepts stains, paints, and other surface finishes without standing out, making it a practical choice for visible exterior surfaces where aesthetics matter alongside performance.
• Trusted Simpson quality from a USA-based manufacturer - built to the dimensional and material standards that structural contractors rely on for consistent, repeatable results on the job site.

Specifications

• Brand: Simpson Strong-Tie
• Nail Type: Box Nail
• Penny Size: 12d
• Length: 3-1/4 in.
• Shank Type: Annular Ring Shank
• Shank Diameter: 0.131 in.
• Head Type: Full Round Head
• Head Diameter: 2/7 in.
• Head Pattern: Checkered
• Point Type: Diamond Point
• Gauge: 10
• Material/Coating: Type 304 Stainless Steel
• Approx. Count per Lb.: 72
• Country of Origin: United States

Available Pack Options

• S12ABN1: 1 Lb (72)
• S12ABN5: 5 Lb (360)
• S12ABNB: 25 Lb (1800)

Frequently Asked Questions

What is the difference between type 304 and type 316 stainless steel nails, and which should I choose?

Type 304 stainless steel provides excellent corrosion resistance for most outdoor and treated-lumber applications. Type 316 stainless steel offers superior resistance to chloride and salt exposure, making it the preferred choice for seaside or marine environments. If your project is located near the coast or is subject to saltwater spray, type 316 is recommended. For inland exterior and permanent wood foundation work, type 304 performs reliably.

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

The annular ring shank features a series of rings along the shank that mechanically interlock with wood fibers as the nail is driven. This significantly increases withdrawal resistance - the force required to pull the nail back out - compared to a smooth-shank nail of the same size. This makes annular ring shank nails the preferred choice for applications where holding power is critical, such as decking, siding, subfloors, and permanent wood foundations.

Are these nails compatible with pressure-treated lumber?

Yes. Stainless steel fasteners are widely recognized as compatible with pressure-treated lumber, including newer preservative formulations that can accelerate corrosion in standard steel or even hot-dipped galvanized fasteners. The 304 stainless steel construction of these nails resists the chemical environment created by treated wood, helping maintain connection integrity over the long term.

Can these nails be used with a pneumatic nailer or nail gun?

These nails are sold as bulk loose nails (individual/each basis) rather than in collated strips or coils. Check your pneumatic nailer's specifications and confirm that loose or hand-drive nails are appropriate for your tool before use. For hand nailing, the diamond point tip and full round head make driving straightforward in standard framing and decking applications.

Note: Product dimensions may differ from picture. Please see item description for specifications.