Simpson 8d x 2 3/8" 20-22 Degree Collated Ring-Shank Nail in 316 Stainless Steel by Simpson Strong-Tie delivers reliable, high-withdrawal-resistance fastening for wood framing and wood-to-wood connections. Built for use with pneumatic nailers, these 12-gauge, full-round-head nails are collated at 20 deg.-22 deg. on a plastic strip, making installation faster and more consistent across a wide range of structural and outdoor applications. The Type 316 stainless steel construction provides outstanding protection against corrosion, making these ring-shank nails a strong choice for coastal, marine, and other demanding environments where standard fasteners would fail prematurely.

Key Features

• Type 316 Stainless Steel Material - provides superior corrosion resistance compared to standard stainless grades, making this nail well-suited for seaside, high-moisture, and chemically aggressive environments where long-term fastener integrity is critical.
• Annular Ring Shank - the ring-shank profile dramatically increases withdrawal resistance compared to smooth-shank nails, creating a more secure, grip-lock attachment that holds up under structural stress and wood movement.
• Full Round Head with Checkered Pattern - the 9/32" full round head maximizes bearing surface for strong holding power, while the checker pattern blends with wood grain, reduces sunlight glare, and accepts surface finishes for a clean final appearance.
• 20 deg.-22 deg. Plastic Strip Collation - the angled plastic-strip format is compatible with many major manufacturers' pneumatic nailers, reducing driving force required and increasing installation speed on the job site.
• Diamond Point Tip - the sharp diamond point allows the nail to start cleanly and drive accurately into wood framing without splitting, maintaining fastener alignment and reducing waste.
• 12 Gauge, 2 3/8" Length - the heavy 12-gauge wire diameter and 2 3/8" length provide the structural mass needed for solid wood-to-wood framing connections in residential and commercial construction.
• Made in the United States - domestic manufacturing supports consistent quality control and reliable production standards.

Why This Product

• For framing near saltwater, high humidity, or chemically treated wood environments, the Type 316 stainless steel construction resists the corrosion that degrades carbon steel or lower-grade stainless fasteners over time - keeping connections strong throughout the life of the structure.
• The annular ring shank pattern means these nails resist being pulled back out of the wood far more effectively than smooth-shank alternatives, which is critical in structural wood framing where fastener withdrawal could compromise connection integrity.
• The 20 deg.-22 deg. plastic-strip format works with a broad range of pneumatic nailers from major tool brands, so crews can drive these nails quickly without specialized equipment - reducing labor time and keeping projects on schedule.
• The checkered full round head is designed to accept surface finishes and blend naturally with wood grain - a practical advantage for exposed wood framing and finish applications where fastener visibility matters.

Specifications

• Brand: Simpson Strong-Tie
• Penny Size: 8d
• Length: 2 3/8 in.
• Gauge: 12
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Shank Type: Annular-Ring Shank
• Shank Diameter: 0.113 in.
• Head Type: Full Round Head
• Head Diameter: 9/32 in.
• Head Pattern: Checkered
• Point Type: Diamond Point
• Collation Angle: 20 deg.-22 deg.
• Collation Type: Plastic Strip
• Country of Origin: United States

Available Pack Options

• T12A237CNJ: 1000 Pk
• T12A237CNB: 5000 Pk

Approved Applications

• Framing - Wood
• Fastening Wood-to-Wood

Frequently Asked Questions

What makes the annular ring shank different from a smooth-shank nail, and why does it matter?

The annular ring shank features continuous rings along the nail's body that grip the wood fibers on all sides. This significantly increases withdrawal resistance compared to smooth-shank nails, meaning the fastener holds more securely under load and resists being pulled back through the wood. For structural wood framing and wood-to-wood connections, this added grip translates directly into stronger, more durable assemblies.

Why choose Type 316 stainless steel over other nail materials for outdoor or coastal framing?

Type 316 stainless steel contains molybdenum, which gives it superior resistance to chlorides, saltwater, and many chemicals compared to standard 304 stainless steel or galvanized options. For framing applications near the ocean, in high-humidity environments, or where long-term corrosion resistance is required, Type 316 stainless steel fasteners maintain their structural integrity and appearance far longer than less resistant alternatives.

What pneumatic nailers are compatible with these 20 deg.-22 deg. plastic-strip collated nails?

These nails are compatible with many major manufacturers' pneumatic nailers that accept 20 deg.-22 deg. plastic-strip collated framing nails. For a complete list of verified compatible tool models, refer to the Tool Compatibility Matrix in the Downloads section below, or contact us for personalized assistance with fastener and tool matching.

What does the checkered head pattern on these nails do?

The checkered pattern on the 9/32" full round head serves three practical functions: it blends with natural wood grain for a less conspicuous appearance, it reduces sunlight glare on exposed fastener heads, and it accepts surface finishes such as paint or stain so the nail head can be finished to match the surrounding material.

Downloads and Resources

• Tool Compatibility Matrix

Note: Product dimensions may differ from picture.