Simpson Premium Siding Nail - 1-1/4" x 5/32" Head, 14 Gauge, 316 Stainless Steel by Simpson Strong-Tie is engineered for wood siding fastening in demanding outdoor and coastal environments. Crafted from passivated Type 316 stainless steel with an annular-ring shank and full round circle head, this 3d nail delivers exceptional corrosion resistance and holding power - making it the go-to choice for siding installations near saltwater, in high-humidity climates, or anywhere exposure to corrosive conditions is a concern.

Key Features

• Passivated Type 316 Stainless Steel material - the passivation process enhances the natural corrosion resistance of 316 stainless steel, making these nails suitable for severely corrosive environments including seaside and coastal applications where standard fasteners would fail prematurely.
• Annular-ring shank design - the rings grip into wood fibers along the full length of the shank, significantly increasing withdrawal resistance and providing greater holding power than smooth-shank alternatives - keeping siding boards secure over the long term.
• Full round circle head pattern - the circular head pattern reduces glare on the nail surface and accepts surface finishes or paint, helping siding nails blend in with the finished appearance of the installed siding.
• Diamond point tip - drives straight and true on impact, reducing the risk of board splitting when fastening wood siding - especially valuable when working close to board edges.
• 14 gauge, 1-1/4" length (3d penny size) - sized specifically for wood siding applications, offering the right balance of penetration depth and fastener profile for common siding thicknesses.
• Made in the United States - domestic manufacturing supports consistent quality standards and reliable availability for professional contractors and demanding projects.

Why This Product

• Built for the harshest coastal and marine environments - Type 316 stainless steel contains molybdenum, which provides resistance to chlorides and salt spray. If your project is near the ocean or in a region with high salinity, this nail is specifically suited to those conditions rather than a general-purpose galvanized fastener.
• Holds siding more securely over time - the annular-ring shank is engineered to resist pullout far better than a smooth-shank nail, meaning siding boards stay flush and tight through seasonal wood movement, wind loads, and years of weather exposure.
• Reduces on-site rework from nail-driven splits - the diamond point drives accurately and minimizes board splitting, helping installers work faster and with fewer material defects during wood siding projects.
• Designed by a trusted connector and fastener brand - Simpson Strong-Tie produces this nail as part of a purpose-built exterior fastening system, so the specifications align with real-world siding application requirements rather than a generic nail adapted for multiple uses.

Specifications

• Brand: Simpson Strong-Tie
• Penny Size: 3d
• Length: 1-1/4 in.
• Head Diameter: 5/32 in.
• Shank Diameter: 0.083 in.
• Gauge: 14
• Head Type: Full Round Head
• Head Pattern: Circle Head
• Shank Type: Annular-Ring Shank
• Point Type: Diamond Point
• Finish: Type 316 Stainless Steel
• Material: Type 316 Stainless Steel
• Approx. Count Per Lb: 495
• Country of Origin: United States

Available Pack Options

• T3KR51: 1 Lb (495)
• T3KR55: 5 Lb (2475)
• T3KR5B: 25 Lb (12375)

Approved Applications

• Fastening Wood Siding

Frequently Asked Questions

Why choose Type 316 stainless steel over standard stainless or galvanized nails for siding?

Type 316 stainless steel contains molybdenum, which provides superior resistance to chloride-induced corrosion compared to Type 304 stainless or galvanized coatings. These nails are passivated to further enhance that resistance, making them the appropriate choice for siding in severely corrosive environments, including seaside and coastal locations where salt spray accelerates fastener deterioration.

What does "passivated" mean in the context of these stainless steel nails?

Passivation is a chemical treatment applied to stainless steel that removes surface contaminants and enhances the formation of a protective chromium oxide layer on the metal. This process strengthens the nail's natural corrosion resistance, helping it maintain structural integrity and appearance even in harsh outdoor and marine environments.

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

An annular-ring shank features circular ridges along the shank length that grip into the wood fibers as the nail is driven. This mechanical interlock significantly increases withdrawal resistance compared to a smooth shank, meaning the nail holds much more firmly against forces that would otherwise pull the fastener out - such as wind pressure or wood shrinkage and expansion with seasonal moisture changes.

Is the circle head pattern purely decorative, or does it serve a functional purpose?

The circle head pattern on this nail serves both functional and aesthetic purposes. Functionally, the pattern reduces glare on the nail head surface, which can be important for visible exterior applications. It also improves the nail's ability to accept surface finishes such as paint or stain, helping the fastener blend with the finished appearance of installed wood siding.

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