Simpson 12d x 3-1/4" Annular Ring Shank Box Nail in 316 Stainless Steel is a premium fastener engineered for demanding outdoor and coastal construction projects where long-term corrosion resistance is non-negotiable. Built by Simpson from type 316 stainless steel, these box nails deliver a secure, lasting hold in wood framing, decking, siding, and permanent wood foundation applications - especially in seaside or high-moisture environments where inferior fasteners would corrode and fail prematurely.

Key Features

• Type 316 stainless steel construction - provides superior corrosion resistance compared to standard stainless grades, making it the right choice for saltwater coastal environments, high-humidity conditions, and contact with chemically treated lumber where rust and staining are real concerns.
• Annular ring shank design - the ring-threaded shank dramatically increases withdrawal resistance so the nail grips tightly over time, reducing the risk of fastener backing out under stress, seasonal wood movement, or heavy loads.
• Full round head with checkered pattern - the textured head surface blends with wood grain, minimizes sun glare on exposed surfaces, and accepts paints, stains, and other surface finishes for a cleaner finished appearance.
• Diamond point tip - allows clean, precise nail starts with minimal splitting, saving time and reducing waste during installation in framing, sheathing, and decking applications.
• 10-gauge, 12d / 3-1/4" size - the combination of a 0.131" shank diameter and 3-1/4" length provides substantial holding power suited for structural box nail applications in wood construction.
• Made in the United States - domestic manufacturing supports consistent quality control and reliable material traceability for construction professionals.

Why This Product

• Built for seaside and marine environments - type 316 stainless steel contains added molybdenum, giving it measurably better resistance to chloride-rich saltwater air and moisture than type 304, making this nail the correct specification for oceanfront or coastal projects where fastener longevity matters.
• Recommended for permanent wood foundations - stainless steel nails like this 316 grade are specifically recommended under ANSI/AF&PA Permanent Wood Foundations Design Specifications, meaning specifiers and contractors can use them with confidence on code-sensitive work.
• Annular ring shank holds firm over time - unlike smooth shank nails that can gradually withdraw under vibration or wood shrinkage, the ring shank geometry mechanically locks into wood fibers, ensuring connections stay tight through years of service.
• Finish-ready checkered head - the head pattern is designed to accept surface finishes, making these nails practical for visible exterior applications - such as trim, siding, or deck boards - where a clean, paintable surface is expected.

Specifications

• Brand: Simpson Strong-Tie
• Coating/Material: Type 316 Stainless Steel
• Penny Size: 12d
• Length: 3-1/4 in.
• Head Diameter: 2/7 in.
• Shank Diameter: 0.131 in.
• Gauge: 10
• Shank Type: Annular-Ring Shank
• Head Type: Full Round Head
• Head Pattern: Checkered
• Point Type: Diamond Point
• Approx. Count per Lb.: 72
• Country of Origin: United States

Available Pack Options

• T12ABN1: 1 Lb (72)
• T12ABN5: 5 Lb (360)

Frequently Asked Questions

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

Type 316 stainless steel contains molybdenum, which gives it enhanced resistance to chlorides and corrosive environments compared to type 304. Simpson recommends type 316 for seaside applications and any project requiring superior corrosion resistance - such as oceanfront decks, docks, or coastal wood framing - while type 304 is suitable for less demanding corrosive conditions.

Are these nails appropriate for permanent wood foundation construction?

Yes. Stainless steel nails are specifically recommended for permanent wood foundation construction under the ANSI/AF&PA Permanent Wood Foundations Design Specifications. The type 316 stainless steel grade used in these nails meets that recommendation, making them a reliable fastener choice for this application.

What does the annular ring shank do compared to a smooth shank nail?

The annular ring shank features circumferential ridges along the shank that mechanically interlock with wood fibers after driving. This significantly increases the nail's withdrawal resistance - meaning it resists being pulled back out far more effectively than a smooth shank nail - which results in stronger, longer-lasting connections in framing, sheathing, and decking.

Will the checkered head pattern affect the appearance of finished wood surfaces?

The checkered head pattern is specifically designed to blend with wood grain and reduce glare from sunlight on exposed surfaces. It also accepts surface finishes such as paint or stain, so these nails are well suited for visible exterior applications where a clean or finished appearance is desired.

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