Simpson 8d - 2-1/2" Shake and Shingle Siding/Roofing Nail in Type 316 Stainless Steel is a purpose-built fastener from Simpson Strong-Tie, engineered for securing wood shakes and shingles in roofing and exterior siding applications. Constructed from Type 316 stainless steel, this nail delivers exceptional corrosion resistance in harsh outdoor environments, including coastal and high-moisture settings where standard fasteners fail prematurely. The annular-ring shank design locks into wood fibers to resist withdrawal forces over time, making it a dependable choice for long-term roof and siding performance.

Key Features

• Type 316 Stainless Steel construction - resists corrosion from saltwater, moisture, and outdoor weathering, extending the service life of roofing and siding installations in demanding environments
• Annular-ring shank - increases withdrawal resistance by gripping wood fibers, providing a secure, lasting attachment that holds shakes and shingles firmly through seasonal movement and wind loading
• 7/32" full round head with checkered pattern - delivers ample bearing surface to prevent the nail from pulling through shakes and shingles, while the checkered face blends with wood grain, reduces glare from sunlight, and accepts surface finishes
• Slender 0.092" shank diameter (13 gauge) - minimizes splitting of thin or delicate shake and shingle material during installation, protecting the integrity of the finished surface
• Diamond point tip - promotes easier driving by self-centering on the nail path and reducing installation effort, improving productivity on roofing and siding jobs
• 8d penny size at 2-1/2" length - provides proper penetration depth for securing shakes and shingles to roof decking and wood siding substrates
• Made in the United States - manufactured domestically to consistent quality standards

Why This Product

• Type 316 stainless steel offers superior corrosion resistance compared to standard galvanized fasteners, making these nails an appropriate choice for coastal, humid, or chemically exposed environments where exterior fastener longevity is critical
• The annular-ring shank directly addresses one of the most common failure points in roofing and siding - fastener backout over time - by mechanically gripping wood fibers to maintain holding power even as materials expand and contract with temperature changes
• The slender gauge combined with the diamond point tip makes this nail well-suited for splitting-sensitive materials like hand-split shakes and thin shingles, reducing waste and rework on the job
• The checkered full round head provides both functional bearing surface and a low-profile aesthetic finish that blends into wood grain and accepts stains or coatings, making it appropriate for visible siding applications

Specifications

• Brand: Simpson Strong-Tie
• Finish/Material: Type 316 Stainless Steel
• Penny Size: 8d
• Length: 2-1/2 in.
• Gauge: 13
• Shank Diameter: 0.092 in.
• Shank Type: Annular-Ring Shank
• Head Type: Full Round Head
• Head Diameter: 7/32 in.
• Head Pattern: Checkered
• Point Type: Diamond Point
• Approximate Count Per Lb: 196
• Country of Origin: United States

Available Pack Options

• T8SN71: 1 Lb (196)
• T8SN75: 5 Lb (980)
• T8SN7B: 25 Lb (4900)

Approved Applications

• Roofing
• Fastening Wood Siding

Frequently Asked Questions

Why is Type 316 stainless steel recommended for shake and shingle roofing nails?

Type 316 stainless steel provides strong resistance to corrosion caused by moisture, salt air, and outdoor weathering. In roofing and exterior siding applications, fasteners are continuously exposed to these elements, and corrosion can cause staining, fastener failure, and loosening of shakes and shingles over time. Type 316 stainless steel is one of the more corrosion-resistant grades available for outdoor fastener use, making it well-suited for long-term performance in these applications.

What is the advantage of an annular-ring shank over a smooth shank for roofing and siding nails?

An annular-ring shank features rings along the shank that grip wood fibers as the nail is driven, significantly increasing withdrawal resistance compared to a smooth shank nail of the same diameter and length. This is especially important in roofing and siding applications where wind uplift and seasonal wood movement can work smooth-shank nails loose over time. The annular-ring shank on these Simpson nails helps maintain a secure, lasting hold in shakes and shingles.

Will the slender gauge of this nail cause splitting in wood shakes and shingles?

The slender 0.092 in. shank diameter (13 gauge) is specifically designed to minimize splitting when driven through shakes and shingles. This is complemented by the diamond point tip, which self-centers and displaces wood fibers cleanly during driving rather than cutting through them aggressively. Together, these features help protect the integrity of thin or delicate shake and shingle materials during installation.

What does the checkered head pattern on this nail provide?

The checkered pattern on the full round head serves several practical purposes. It blends with the natural wood grain of shakes and shingles for a lower-profile visual appearance, reduces glare from sunlight on finished surfaces, and accepts surface finishes such as stains or coatings. The full round head at 7/32 in. diameter also provides sufficient bearing surface to prevent the nail from pulling through the shake or shingle material under load.