Simpson 1-1/4 in. 15 deg. Wire Coil Ring-Shank Siding Nail 13 Ga Type 316 SS Full Round Head 1800-Pk is a collated fastener from Simpson engineered for efficient, long-lasting fiber cement board and wood siding installation. Built from Type 316 stainless steel for superior corrosion resistance in coastal and seaside environments, this 15 deg. wire-coil nail reduces driving force and accelerates installation speed when used with compatible pneumatic coil siding nailers. Every design detail - from its annular ring shank to its checkered full round head - addresses the real-world demands of professional siding work.

Key Features

• Ideal for use in fiber-cement boards - purpose-built for one of the most common modern siding substrates, ensuring reliable fastening without material damage.
• Checkered head pattern - blends with wood grain, reduces glare from sunlight, and accepts surface finishes so nail heads stay visually unobtrusive after installation.
• Generous underhead fillet - allows nails to be driven flush or countersunk without crushing surrounding wood, protecting the siding surface and maintaining a clean finish.
• Annular ring shank - increases withdrawal resistance to provide a secure attachment that directly reduces cupping of siding boards over time, preserving a flat, professional appearance.
• Slender 13-gauge body and diamond point - work together for easier driving with less resistance, reducing tool wear and installer fatigue on large jobs.
• Type 316 stainless steel construction - delivers superior corrosion resistance compared to standard stainless grades, making these nails especially well-suited for seaside and high-moisture applications.
• 15 deg. wire-coil collation - compatible with many major manufacturers' pneumatic coil nailers, enabling faster load cycles and higher productivity on siding projects.

Why This Product

• Built for coastal and high-moisture job sites - Type 316 stainless steel offers a higher level of corrosion resistance than standard stainless steel, making these nails a reliable long-term choice where salt air, humidity, or wet conditions are a concern.
• Engineered to keep siding flat and secure - the annular ring shank's enhanced withdrawal resistance works against the natural forces that cause siding boards to cup and warp, helping the finished installation maintain its appearance for years.
• Designed to protect the material being fastened - the checkered head pattern and generous underhead fillet allow precise, damage-free driving into fiber cement and wood siding without marring the surface or crushing surrounding material.
• Speeds up production without sacrificing holding power - wire-coil collation at 15 deg. pairs with a slender gauge and diamond point to reduce driving force, letting installers work faster with compatible pneumatic tools while still achieving a firm, lasting attachment.

Specifications

• MPN: T13A125SNJ
• Brand: Simpson Strong-Tie
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Gauge: 13
• Length: 1-1/4 in.
• Head Type: Full Round Head
• Head Diameter: 0.221 in.
• Head Pattern: Checkered
• Shank Type: Annular-Ring Shank
• Shank Diameter: 0.092 in.
• Point Type: Diamond Point
• Collation Type: Wire Coil
• Collation Angle: 15 deg.
• Packaging Quantity: 1,800
• Country of Origin: United States

Approved Applications

• Fastening Wood Siding
• Fiber cement board installation

Frequently Asked Questions

What material are these siding nails made from, and why does it matter?

These nails are made from Type 316 stainless steel, which provides superior corrosion resistance compared to standard stainless steel grades. This makes them especially well-suited for seaside and coastal applications where exposure to salt air and moisture can rapidly degrade lesser fasteners.

Why does the annular ring shank matter for siding installation?

The annular ring shank increases withdrawal resistance, creating a more secure attachment between the fastener and the substrate. This enhanced holding power directly reduces the cupping of siding boards over time, helping maintain a flat, professional appearance on the finished surface.

What collation angle and type are these nails, and which tools are they compatible with?

These nails feature 15 deg. wire-coil collation. This format is compatible with many major manufacturers' pneumatic coil siding nailers, allowing for reduced driving force and faster installation compared to hand-nailing.

What is the significance of the checkered head pattern and the generous underhead fillet on these nails?

The checker pattern on the nail heads blends with wood grain, reduces glare from sunlight, and accepts surface finishes for a cleaner look. The generous underhead fillet allows nails to be driven flush or countersunk without crushing the surrounding wood, preserving the integrity of the material being fastened.

Note: Product dimensions and/or thread length may differ from picture.