Simpson 12d - 3-1/4" Wood Siding Nail in Type 304 Stainless Steel by Simpson Strong-Tie is a professional-grade fastener built for securing wood siding panels with reliable holding power and long-term corrosion resistance. Featuring an annular ring shank for superior withdrawal resistance and a checker-patterned full round head that blends seamlessly with wood grain, this nail is engineered to keep siding firmly in place while maintaining a clean, finished appearance. Crafted from Type 304 stainless steel and made in the United States, it delivers the corrosion-resistant performance needed for demanding exterior siding applications - reducing cupping, minimizing fastener failure, and standing up to outdoor exposure over time.

Key Features

• Type 304 Stainless Steel material - provides corrosion-resistant performance in exterior siding applications, helping fasteners maintain structural integrity in outdoor environments exposed to moisture and weathering
• Annular ring shank design - dramatically increases withdrawal resistance compared to smooth-shank nails, locking into wood siding panels to reduce cupping and board movement over time
• Checkered full round head pattern - the textured surface blends with wood grain, reduces glare from sunlight, and accepts surface finishes such as paint or stain for a cleaner, more finished look
• Diamond point tip - makes driving easier and more precise, reducing the effort required to fasten through wood siding panels and minimizing the risk of splitting
• 12 Gauge, 3-1/4" length (12d penny size) - delivers the nail depth and shank diameter (0.113 in.) needed for a secure, pull-through-resistant attachment in wood siding panels
• Made in the United States - manufactured to Simpson Strong-Tie quality standards, ensuring consistent dimensions and reliable performance across every fastening application

Why This Product

• The annular ring shank is purpose-built for wood siding - where withdrawal resistance is critical to preventing boards from pulling away from the structure, warping, or cupping over the life of the installation
• Type 304 stainless steel construction makes this nail a dependable choice for exterior siding projects where long-term exposure to moisture, humidity, and outdoor conditions can cause lesser fasteners to corrode and fail
• The checkered head pattern does double duty - it reduces reflective glare on finished siding and provides a surface that accepts paint and stain, helping the fastener disappear into the finished look of the siding
• With approximately 110 nails per pound, this Simpson Strong-Tie wood siding nail gives installers a consistent, predictable quantity for estimating material needs on wood siding panel projects

Specifications

• Brand: Simpson Strong-Tie
• Material / Finish: Type 304 Stainless Steel
• Penny Size: 12d
• Length: 3-1/4 in.
• Gauge: 12
• Shank Diameter: 0.113 in.
• Head Diameter: 7/32 in.
• Shank Type: Annular-Ring Shank
• Head Type: Full Round Head
• Head Pattern: Checkered
• Point Type: Diamond Point
• Approx. Count per Lb: 110
• Country of Origin: United States

Available Pack Options

• S12SND1: 1 Lb (110)
• S12SND5: 5 Lb (550)
• S12SNDB: 25 Lb (2750)

Approved Applications

• Fastening Wood Siding

Frequently Asked Questions

Why is an annular ring shank better than a smooth shank for wood siding?

The annular ring shank features ridges along the shank that grip the surrounding wood fibers, significantly increasing withdrawal resistance compared to a smooth shank nail. This helps prevent wood siding panels from pulling away from the substrate, reduces cupping of siding boards, and maintains a secure attachment over the long term - especially important as wood expands and contracts with seasonal moisture changes.

What does the checkered head pattern on this nail do?

The checker pattern on the full round head serves three practical purposes: it blends with the natural texture of wood grain for a less visible fastener appearance, it reduces glare from sunlight on the exposed nail head, and it provides a surface that accepts paint, stain, and other surface finishes - allowing the nail to integrate cleanly into the finished look of a wood siding installation.

Is Type 304 stainless steel suitable for all exterior siding environments?

Type 304 stainless steel provides strong corrosion resistance that makes it well suited for most exterior wood siding applications exposed to moisture, humidity, and outdoor weather conditions. For applications in highly corrosive coastal or seaside environments, a Type 316 stainless steel fastener may be a more appropriate choice due to its superior resistance to saltwater exposure.

What nail dimensions should I know before selecting this wood siding nail?

This nail is a 12d (twelve-penny) size with a 3-1/4 in. length, a 12-gauge shank measuring 0.113 in. in diameter, and a 7/32 in. full round head diameter. The diamond point tip aids in driving, and the annular ring shank provides the withdrawal resistance needed for securing wood siding panels effectively.