Simpson 12d x 3-1/4" 20 deg.-22 deg. Collated Ring-Shank Nail in Type 304 Stainless Steel is a professional-grade framing and structural fastener engineered by Simpson Strong-Tie for projects that demand lasting hold and corrosion resistance. Designed for use with pneumatic nailers, this full-round-head, annular-ring shank nail in 10-gauge Type 304 stainless steel delivers superior withdrawal resistance compared to smooth-shank alternatives - making it an ideal choice for decking, fencing, siding, and outdoor structural applications where moisture exposure is a concern. The plastic-strip collation at a 20 deg.-22 deg. angle ensures fast, reliable feeding in a wide range of pneumatic framing nailers from major manufacturers.

Key Features

• Annular-ring shank (ring shank) design - increases withdrawal resistance so fasteners stay firmly seated over time, even in wood that expands and contracts with moisture changes
• Type 304 stainless steel material - resists corrosion in outdoor, coastal-adjacent, and moisture-prone environments, extending the service life of the connection
• Full round head with checkered pattern - the 9/32" diameter head delivers maximum bearing surface for code-compliant holding strength, while the checker pattern blends with wood grain, reduces sunlight glare, and accepts surface finishes
• Diamond point tip - penetrates wood cleanly and with less splitting, reducing material waste and rework
• 20 deg.-22 deg. plastic-strip collation - compatible with many major manufacturers' pneumatic framing nailers, reducing driving force and increasing installation speed on the job
• 10-gauge wire, 3-1/4" length, 0.131" shank diameter - sized to meet 12d nail specifications for common structural framing and sheathing applications
• Made in the United States - manufactured domestically for consistent quality control

Why This Product

• The Type 304 stainless steel finish provides genuine corrosion resistance for outdoor wood structures, decks, and applications exposed to rain, humidity, or treated lumber - without the gray staining that can occur with standard galvanized nails
• The annular-ring shank grips wood fibers mechanically, making these nails a stronger choice than smooth-shank nails where pull-through or withdrawal forces are a concern - such as in decking or shear-wall applications
• The 20 deg.-22 deg. plastic-strip format is widely compatible with pneumatic framing nailers from Bosch, Bostitch, DeWalt, Grip-Rite, Hitachi, and other major brands, so crews can pick up and work without lengthy tool-compatibility checks
• The checkered full-round head accepts surface finishes and resists glare - a practical advantage on exposed decking and finish carpentry where nail heads remain visible

Specifications

• Brand: Simpson Strong-Tie
• Penny Size: 12d
• Length: 3-1/4 in.
• Gauge: 10
• Shank Diameter: 0.131 in.
• Shank Type: Annular-Ring Shank
• Head Type: Full Round Head
• Head Diameter: 9/32 in.
• Head Pattern: Checkered
• Point Type: Diamond Point
• Material / Finish: Type 304 Stainless Steel
• Collation Angle: 20 deg.-22 deg.
• Collation Type: Plastic Strip
• Country of Origin: United States

Available Pack Options

• S10A325CNJ: 1000 Pk
• S10A325CNB: 4000 Pk

Frequently Asked Questions

What pneumatic nailers are compatible with these collated nails?

These 20 deg.-22 deg. plastic-strip collated nails are compatible with many major manufacturers' pneumatic framing nailers. Compatible tools include models from Bosch (SN350-20F up to 0.148"), Bostitch (F21PL), DeWalt (D51850 up to 0.148", D51844 up to 0.148"), Grip-Rite (GRTFR83 up to 0.131" 3-1/4", GRTRH350 up to 0.148"), and Hitachi (NR83AS up to 0.131" 3-1/4", NR90AC3, NR90AEPR up to 0.148", NR90GR), among others. See the Tool Compatibility Matrix in the Downloads section for the full list.

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

The annular-ring (ring) shank features rings along the shank that grip wood fibers as the nail is driven, significantly increasing withdrawal resistance. This mechanical grip means the nail resists being pulled back out under load, providing a more secure attachment than a smooth-shank nail of the same size - especially important in structural framing, decking, and sheathing connections.

Is Type 304 stainless steel appropriate for treated lumber or outdoor use?

Type 304 stainless steel provides strong corrosion resistance and is suitable for many outdoor and moisture-exposed applications. For seaside applications or environments requiring superior corrosion resistance, Simpson Strong-Tie also offers a Type 316 stainless steel option, which delivers enhanced performance in salt-air and marine-adjacent conditions.

What does the checkered head pattern on these nails do?

The checkered (checker) pattern on the full-round head serves three practical purposes: it blends with natural wood grain for a cleaner appearance, it reduces sunlight glare on exposed nail heads, and it accepts surface finishes such as paint or stain - making these nails a good fit for visible decking, siding, and finish applications in addition to structural framing.

Downloads and Resources

• Tool Compatibility Matrix

Note: Product dimensions may differ from picture.