Simpson 8d Premium Siding Nail in passivated Type 316 Stainless Steel is engineered for wood siding fastening in the most demanding outdoor environments. Built by Simpson Strong-Tie, this 2-1/2 inch, 13-gauge nail combines an annular-ring shank for superior holding power with a full round circle head designed to reduce glare and accept surface finishes - making it a trusted choice for coastal construction, seaside homes, and any exterior application where long-term corrosion resistance is non-negotiable.

Key Features

• Passivated Type 316 Stainless Steel material - withstands saltwater exposure, moisture, and severely corrosive environments, making these nails ideal for seaside siding applications where standard fasteners would fail prematurely.
• Annular-ring shank design - increases withdrawal resistance and provides greater holding power compared to smooth-shank nails, keeping siding firmly in place over time and through temperature cycles.
• Full round circle head pattern - reduces glare on finished surfaces and accepts paint or other surface finishes, helping installed siding maintain a clean, professional appearance.
• Diamond point tip - drives true into wood siding with precision and reduces the risk of board splitting during installation, saving time and minimizing material waste.
• 13-gauge, 0.092-inch shank diameter - provides a strong, consistent drive profile sized appropriately for wood siding fastening without overdriving or mushrooming the head.
• 8d penny size at 2-1/2 inch length - delivers the penetration depth needed for secure siding attachment across standard applications.
• Made in the United States - manufactured domestically to Simpson Strong-Tie quality standards for reliable, consistent performance.

Why This Product

• Built for corrosive coastal environments - Type 316 stainless steel is the appropriate choice for seaside and high-humidity exterior applications where lesser materials corrode and fail. The passivation process further enhances the alloy's resistance to oxidation, extending fastener life alongside the siding it holds.
• Holds stronger over time - the annular-ring shank bites into wood fibers to resist withdrawal forces caused by wind, seasonal movement, and moisture cycling, reducing the chance of siding loosening or backing out years after installation.
• Minimizes installation problems on-site - the diamond point drives true and resists splitting wood boards, while the circle head seats cleanly without excessive surface damage, so installers work faster with fewer callbacks.
• Trusted Simpson Strong-Tie quality for exterior fastening - backed by a brand recognized for structural and exterior fastening solutions, these siding nails are designed specifically for exterior wood siding in severe-exposure conditions, not adapted from general-purpose hardware.

Specifications

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

Available Pack Options

• T8KR71: 1 Lb (196)
• T8KR75: 5 Lb (980)
• T8KR7B: 25 Lb (4900)

Approved Applications

• Fastening Wood Siding

Frequently Asked Questions

Why choose Type 316 stainless steel for siding nails instead of standard galvanized fasteners?

Type 316 stainless steel contains molybdenum, which significantly enhances resistance to chlorides and corrosive agents found in saltwater air and harsh outdoor environments. Combined with passivation, these nails are specifically suited for seaside applications and severely corrosive conditions where standard galvanized nails may corrode and stain or fail to hold siding securely over time.

What is an annular-ring shank and why does it matter for siding installation?

An annular-ring shank features rings along the shank that grip wood fibers as the nail is driven, creating mechanical resistance against withdrawal. This means the nail resists backing out due to wind load, wood movement, and seasonal expansion and contraction - providing greater long-term holding power than a smooth-shank nail of the same size.

What does the circle head pattern on this siding nail do?

The circle head pattern on the full round head reduces surface glare after installation and is designed to accept surface finishes such as paint. This helps installed siding maintain a cleaner, more finished appearance compared to heads with more pronounced surface textures.

How does the diamond point help during wood siding installation?

The diamond point geometry allows the nail to drive true - meaning it follows a straight path into the wood rather than deflecting - and it reduces the tendency to split boards as it penetrates. This is especially valuable when fastening wood siding where board splitting can damage the material and create gaps that allow moisture intrusion.

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