Simpson 7d 2-1/4" 316 Stainless Steel Wood Siding Nail by Simpson Strong-Tie is purpose-built for securing wood siding panels where long-term holding power and corrosion resistance are essential. Featuring an annular-ring shank for superior withdrawal resistance and a checkered full round head that blends naturally with wood grain, this exterior fastener is the dependable choice for wood siding installations in coastal, high-moisture, and demanding outdoor environments. Type 316 stainless steel construction delivers exceptional resistance to rust, salt air, and weathering - keeping siding firmly in place for years without compromising the finished appearance of the surface.

Key Features

• Type 316 Stainless Steel material - provides superior corrosion resistance compared to standard stainless grades, making these nails ideal for seaside, salt-air, and chemically aggressive environments where exterior fasteners are most vulnerable to deterioration
• Annular-ring shank - dramatically increases withdrawal resistance so siding boards stay locked in place, reducing the cupping, warping, and loosening that smooth-shank nails can allow over time
• Checkered full round head pattern - blends with wood grain to minimize visual contrast, reduces glare from sunlight, and accepts surface finishes so the fastener head disappears into the finished siding
• Diamond point tip - designed for easier, more precise driving with less splitting risk, helping installers work efficiently through hardwood and engineered wood siding materials
• 13-gauge wire, 0.092" shank diameter - sized appropriately for wood siding panel attachment, balancing penetration ease with the holding strength required to resist pull-through
• 2-1/4" length (7d penny size) - provides the depth of penetration needed to anchor siding securely through sheathing and into structural framing members
• 5/32" head diameter - large enough to bear against the siding face and resist pull-through under wind load and thermal movement without being conspicuous
• Made in the United States - manufactured domestically to Simpson Strong-Tie quality standards for consistent performance across every nail in the box

Why This Product

• The right choice for coastal and high-humidity siding projects - Type 316 stainless steel is the preferred material for seaside and salt-spray environments where lesser alloys corrode quickly, causing staining and fastener failure in exposed wood siding
• Engineered specifically for wood siding, not a general-purpose nail - the combination of an annular-ring shank for grip, a checkered head for aesthetics, and a diamond point for clean driving means every design detail targets the unique demands of wood siding installation
• Reduces callbacks from siding movement and nail pop - the annular-ring shank's mechanical grip resists the seasonal expansion and contraction cycles that cause smooth-shank fasteners to back out, helping siding stay flat and tight over time
• Finish-compatible head design preserves the look of the project - the checker-patterned full round head accepts paints and stains so the fastener integrates visually with the siding surface rather than standing out as a bright metallic dot

Specifications

• Brand: Simpson Strong-Tie
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Penny Size: 7d
• Length: 2-1/4 in.
• Gauge: 13
• Shank Diameter: 0.092 in.
• Shank Type: Annular-Ring Shank
• Head Type: Full Round Head
• Head Diameter: 5/32 in.
• Head Pattern: Checkered
• Point Type: Diamond Point
• Approx. Count Per Lb: 215
• Country of Origin: United States

Available Pack Options

• T7SND1: 1 Lb (215)
• T7SND5: 5 Lb (1075)
• T7SNDB: 25 Lb (5375)

Approved Applications

• Fastening Wood Siding

Frequently Asked Questions

Why is Type 316 stainless steel recommended for wood siding nails instead of Type 304 or galvanized?

Type 316 stainless steel contains molybdenum, which gives it enhanced resistance to chlorides, salt spray, and corrosive chemicals compared to 304 stainless or galvanized options. For wood siding applications in coastal or high-humidity environments, 316 stainless is the preferred choice because it resists the rust and staining that can bleed through paint and compromise both the appearance and structural integrity of the siding installation.

What makes the annular-ring shank better for siding applications than a smooth shank?

The annular-ring shank has a series of rings along its length that mechanically interlock with wood fibers as the nail is driven. This dramatically increases withdrawal resistance - the force required to pull the nail back out - compared to a smooth-shank nail. For wood siding, this means the boards stay firmly attached even as the material expands and contracts through seasonal temperature and moisture changes, reducing the risk of nail pop and cupping.

What does the checkered head pattern do, and is it purely decorative?

The checkered pattern on the full round head serves both functional and aesthetic purposes. Functionally, it reduces glare from sunlight reflecting off the nail head and creates a surface that accepts paints, stains, and other surface finishes - allowing the fastener to blend into the finished siding. Aesthetically, the texture mimics wood grain so the nail head becomes far less visible after finishing than a smooth, polished metal head would be.

Is the diamond point important for driving these nails into wood siding?

Yes - the diamond point geometry is specifically designed to pierce wood fibers more cleanly and with less resistance than a blunt or standard point. This makes driving easier and more accurate, and it reduces the splitting risk at board edges and ends, which is particularly important when nailing near the margins of narrow wood siding planks or working close to trim pieces.

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