Simpson 4d 1-1/2" Fiber-Cement Siding Nail in Type 316 Stainless Steel by Simpson Strong-Tie is purpose-built for securing lap and panel siding materials made of fiber-cement composites. Engineered with an annular-ring shank, full round head, and diamond point, this fastener delivers reliable withdrawal resistance and smooth driving performance in demanding exterior applications. The Type 316 stainless steel construction provides superior corrosion resistance, making it an ideal choice for coastal environments, high-humidity installations, and any project where long-term fastener integrity is critical.

Key Features

• Type 316 Stainless Steel material - resists corrosion from saltwater, moisture, and harsh outdoor conditions, making it well-suited for seaside and high-exposure installations
• Annular-ring shank - increases withdrawal resistance so the nail holds firmly in fiber-cement siding over time, reducing the risk of siding loosening or pulling away
• Full round head with checkered pattern - the checkered head surface blends with faux wood grain textures, reduces sunlight glare, and accepts surface finishes for a cleaner finished appearance
• Diamond point tip - allows easier driving through dense fiber-cement composite materials, reducing installer fatigue and minimizing surface damage during application
• 11-gauge, 0.120" shank diameter at 1-1/2" length - provides the correct sizing and shank strength for proper penetration and holding power in fiber-cement siding applications
• 9/32" head diameter - sized to seat securely against the siding surface without overdriving, protecting the integrity of the material
• Made in the United States - domestic manufacturing supports consistent quality standards for each fastener

Why This Product

• Designed specifically for fiber-cement siding - this is not a general-purpose nail. It is engineered expressly for lap and panel siding made of fiber-cement composites, so installers get a fastener matched to the demands of the material.
• Superior corrosion resistance for coastal and exterior use - Type 316 stainless steel offers a higher level of protection against saltwater and chemical exposure compared to standard galvanized fasteners, making this nail the right choice for seaside and long-term outdoor projects.
• Annular-ring shank addresses a real installation challenge - fiber-cement siding can be vulnerable to fastener pull-through and wind uplift. The ring shank design mechanically locks into the substrate to resist those withdrawal forces.
• Finish-friendly head pattern - the checkered full round head is designed to accept surface finishes and reduce glare, so the fastener works with the aesthetics of the finished siding rather than against them.

Specifications

• Brand: Simpson Strong-Tie
• Penny Size: 4d
• Length: 1-1/2 in.
• Gauge: 11
• Shank Diameter: 0.120 in.
• Head Diameter: 9/32 in.
• Shank Type: Annular-Ring Shank
• Head Type: Full Round Head
• Head Pattern: Checkered
• Point Type: Diamond Point
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Approximate Count Per Lb: 179
• Country of Origin: United States

Available Pack Options

• T4PCS1: 1 Lb (179)
• T4PCS5: 5 Lb (895)
• T4PCSB: 25 Lb (4475)

Approved Applications

• Fastening Fiber-Cement Siding

Frequently Asked Questions

Why is Type 316 stainless steel recommended for fiber-cement siding fasteners?

Type 316 stainless steel provides a higher level of corrosion resistance than standard stainless or galvanized options, making it especially well-suited for exterior and coastal environments where moisture and salt exposure can cause lesser fasteners to corrode and stain or weaken over time. Simpson specifically recommends this material for seaside applications.

What is the benefit of an annular-ring shank on a siding nail?

The annular-ring shank features ridges along the shank that mechanically interlock with the surrounding material as the nail is driven. This significantly increases withdrawal resistance compared to a smooth-shank nail, providing a more secure attachment for fiber-cement lap and panel siding that is exposed to wind and thermal movement.

What does the checkered head pattern do?

The checkered pattern on the full round head is designed to blend with faux wood grain textures found on many fiber-cement siding products, reduce sunlight glare from exposed nail heads, and help the nail head accept surface finishes so the finished installation looks cleaner and more uniform.

Is this nail suitable for both lap and panel fiber-cement siding products?

Yes. This fiber-cement siding nail is designed expressly for application of various lap and panel siding materials made of fiber-cement composites, making it appropriate for both siding formats commonly used in residential and commercial exterior construction.