Simpson 7d x 2-1/4" Annular Ring Shank Box Nail in 316 Stainless Steel is a precision-engineered fastener built for demanding outdoor and coastal construction applications. Crafted by Simpson from Type 316 stainless steel, this nail delivers superior corrosion resistance in saltwater environments, seaside structures, and applications where long-term weather exposure is a concern. The annular ring shank design bites into wood fiber and holds firm, making this box nail a reliable choice for permanent wood foundations, deck framing, and other structural assemblies where withdrawal resistance matters.

Key Features

• Type 316 Stainless Steel construction - resists corrosion in saltwater, coastal, and harsh outdoor environments where standard steel or even Type 304 stainless would be prone to degradation
• Annular ring shank design - the threaded ring profile increases withdrawal resistance compared to smooth-shank nails, keeping fastened materials locked together under stress, vibration, and seasonal wood movement
• 12-gauge, 0.113" shank diameter with 2-1/4" length (7d) - the box nail profile reduces wood splitting while delivering sufficient holding strength for structural and finish applications
• Full round head with checkered pattern - the checker head blends with wood grain, minimizes sunlight glare, and accepts surface finishes so nails integrate cleanly into finished surfaces
• Diamond point tip - penetrates wood cleanly and efficiently, reducing drive effort and helping to prevent material cracking during installation
• Recommended for permanent wood foundation construction per ANSI/AF&PA Permanent Wood Foundations Design Specifications - gives builders and inspectors confidence that the fastener meets recognized industry standards for critical structural use

Why This Product

• Purpose-built for seaside and marine-adjacent projects - Type 316 stainless steel provides a higher level of corrosion resistance than Type 304, making this nail the right choice when proximity to salt air, salt water, or moisture-rich environments demands a fastener that won't rust, stain, or compromise structural integrity over time.
• Annular ring shank means the connection stays tight - unlike smooth-shank nails that can back out with wood expansion and contraction cycles, the ring shank profile resists withdrawal forces, reducing callbacks and rework on decks, siding, and foundation systems.
• Checkered head blends into finished surfaces - the head pattern reduces glare and accepts stains and surface finishes, making these nails a practical choice where appearance matters alongside performance, such as visible deck boards or trim applications.
• Manufactured in the United States by Simpson - a trusted name in structural fasteners and connectors, ensuring consistent quality and dimensional accuracy across every nail.

Specifications

• Brand: Simpson Strong-Tie
• Nail Type: Box Nail
• Penny Size: 7d
• Length: 2-1/4 in.
• Shank Type: Annular Ring Shank
• Shank Diameter: 0.113 in.
• Gauge: 12
• Head Type: Full Round Head
• Head Diameter: 1/4 in.
• Head Pattern: Checkered
• Point Type: Diamond Point
• Material/Coating: Type 316 Stainless Steel
• Approximate Count per Lb.: 153
• Country of Origin: United States

Available Pack Options

• T7ABN1: 1 Lb (153)
• T7ABN5: 5 Lb (765)

Frequently Asked Questions

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

Type 316 stainless steel contains molybdenum, which gives it enhanced resistance to chloride corrosion compared to Type 304. For seaside, marine, and coastal construction applications where salt air or salt water exposure is a factor, Type 316 is the recommended choice. Type 304 is suitable for general outdoor use but may show surface corrosion faster in high-chloride environments.

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

The annular ring shank profile features ridges along the nail's shank that grip 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 ring shank nails especially valuable in applications subject to movement, vibration, or repeated load cycles, such as decking, siding, and permanent wood foundations.

Are these nails compliant with permanent wood foundation standards?

Yes. Simpson stainless steel annular ring shank nails are recommended for construction of permanent wood foundations in accordance with the ANSI/AF&PA Permanent Wood Foundations Design Specifications. When specifying fasteners for permanent wood foundation work, stainless steel ring shank nails are the recognized standard for corrosion resistance and withdrawal performance.

What does the checkered head pattern offer beyond appearance?

The checkered pattern on the full round head serves three practical functions: it blends with natural wood grain to reduce visual contrast, it minimizes glare from direct sunlight on exposed nail heads, and it allows the head surface to accept stains and other surface finishes - helping finished surfaces like deck boards and trim maintain a cleaner, more uniform appearance.

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