Simpson 3-1/4 in. 12d Annular Ring Shank Common Nail in Type 316 Stainless Steel is engineered by Simpson Strong-Tie for demanding wood framing and wood-to-wood fastening applications where corrosion resistance is non-negotiable. The annular ring shank design delivers superior withdrawal resistance compared to smooth shank nails, keeping connections tight over time in exterior, coastal, and high-moisture environments. Compliant with ASTM F1667 specifications for post-frame ring-shank nails, this 9-gauge common nail is a trusted fastening solution for projects where long-term structural integrity and resistance to harsh conditions are essential.

Key Features

• Annular ring shank design - increases withdrawal resistance so connections stay secure over time, even under load cycling and seasonal wood movement
• Type 316 stainless steel material and finish - provides superior corrosion resistance compared to Type 304, making it the preferred choice for seaside, marine, and chemical-exposure environments
• 9-gauge wire, 0.148 in. shank diameter - delivers a robust cross-section for strong holding power in wood framing applications without splitting lumber
• Full round head, 5/16 in. diameter - maximizes bearing surface against wood fiber for a flush, secure drive that resists pull-through
• Diamond point tip - eases nail starting and penetration into dense framing lumber, reducing splitting and improving driving speed
• 3-1/4 in. length (12d penny size) - provides the embedment depth required for reliable wood-to-wood connections in standard framing situations
• ASTM F1667 compliant - meets recognized industry specifications for post-frame ring-shank nails, giving builders and inspectors confidence in code-appropriate installations
• Made in the United States - domestic manufacturing ensures consistent quality control and meets project specifications requiring US-made fasteners

Why This Product

• Built for coastal and harsh outdoor environments - Type 316 stainless steel offers a higher level of chloride and chemical resistance than standard stainless grades, making these ring shank nails the right fastener for seaside structures, docks, and exterior wood framing exposed to salt air or moisture
• Stays put under stress - the annular ring shank mechanically locks into wood fiber, resisting withdrawal forces that would cause smooth shank nails to loosen over time in wood framing and post-frame construction
• Code-conscious construction - ASTM F1667 compliance means these nails meet the recognized standard for post-frame ring-shank fasteners, supporting straightforward inspections and peace of mind on regulated jobsites
• A complete exterior fastening system from a trusted brand - Simpson Strong-Tie's exterior nail line is purpose-built to match the longevity of structural connectors, ensuring your wood-to-wood fastening holds as long as the structure itself

Specifications

• Brand: Simpson Strong-Tie
• Length: 3-1/4 in.
• Penny Size: 12d
• Gauge: 9
• Shank Diameter: 0.148 in.
• Shank Type: Annular-Ring Shank
• Head Diameter: 5/16 in.
• Head Type: Full Round Head
• Point Type: Diamond Point
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Approx. Count Per Lb.: 60
• Compliance: ASTM F1667
• Country of Origin: United States

Available Pack Options

• T12ACN1: 1 Lb (60)
• T12ACN5: 5 Lb (300)
• T12ACNB: 25 Lb (1500)

Approved Applications

• Fastening Wood-to-Wood
• Framing - Wood

Frequently Asked Questions

What makes Type 316 stainless steel different from Type 304, and when should I choose it?

Type 316 stainless steel contains molybdenum, which gives it enhanced resistance to chlorides, salt spray, and chemical corrosion compared to Type 304. Simpson Strong-Tie specifically recommends Type 316 for seaside applications and any situation requiring superior corrosion resistance, such as coastal framing, marine structures, and environments with frequent moisture exposure.

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

The annular ring shank features circumferential rings along the shank that mechanically interlock with wood fiber after driving. This significantly increases withdrawal resistance - meaning the nail resists being pulled back out of the wood - compared to a smooth shank nail of the same length. This makes it especially valuable in applications subject to wind uplift, load cycling, or seasonal wood movement.

Does this nail meet any recognized industry standards?

Yes. This nail complies with ASTM F1667 specifications for post-frame ring-shank nails. That standard governs dimensional and performance requirements for this fastener type, which supports code-compliant installations and simplifies project inspection on regulated jobsites.

What are the primary applications for this nail?

This 3-1/4 in. 12d annular ring shank common nail is designed for wood-to-wood fastening and wood framing applications. Its combination of ring shank grip, full round head, and 316 stainless steel construction makes it well-suited for exterior structural connections where both holding strength and long-term corrosion resistance are required.