Simpson Premium Siding Nail, 3d - 1-1/4" Length, 7/32" Head, 316 Stainless Steel, 14 Gauge by Simpson Strong-Tie is a heavy-duty fastener engineered for wood siding installations in the most demanding outdoor and coastal environments. Crafted from passivated Type 316 stainless steel, this nail delivers exceptional corrosion resistance where standard fasteners would fail - making it the go-to choice for seaside homes, high-humidity climates, and any exterior application exposed to severe weather or salt air. Its annular-ring shank and diamond point work together to provide a tight, lasting grip in wood siding that resists loosening over time.

Key Features

• Type 316 Stainless Steel Material - provides superior resistance to rust, salt spray, and chemical exposure compared to standard stainless grades, keeping siding secure and stain-free in severely corrosive environments including seaside locations
• Passivated Finish - the passivation process enhances the natural corrosion resistance of the 316 stainless steel surface, ensuring long-term durability with minimal maintenance in harsh outdoor conditions
• Annular-Ring Shank - the ringed shank bites into wood fibers as the nail is driven, dramatically increasing withdrawal resistance and holding power so siding panels stay firmly in place through expansion, contraction, and heavy winds
• Full Round Circle Head (7/32") - the circular head pattern reduces glare and accepts surface finishes such as paint or stain, allowing the fastener to blend cleanly with finished siding while providing solid bearing surface
• Diamond Point Tip - drives true and straight on entry, reducing the likelihood of board splitting during installation and making nailing faster and more precise
• 14 Gauge, 1-1/4" Length (3d Penny Size) - sized specifically for wood siding applications, offering the right combination of shank diameter and length for secure, code-compatible fastening without over-penetrating thin substrates
• Made in the United States - manufactured domestically, supporting quality control standards expected on professional jobsites

Why This Product

• Built for coastal and severe-exposure siding jobs - Type 316 stainless steel is the recommended material for fasteners in seaside and high-corrosion environments where standard galvanized or 304 stainless nails may fail prematurely. This nail is engineered precisely for those conditions.
• Holds siding through seasonal movement - the annular-ring shank resists withdrawal forces caused by wood expansion and contraction across seasons, reducing the risk of popped nails, loose panels, and costly callbacks.
• Clean, finish-ready appearance - the circle-pattern full round head accepts paint and surface finishes and minimizes glare, making it suitable for visible siding applications where aesthetics matter alongside performance.
• Reduces splitting on install - the blunt diamond point drives straight and minimizes board splitting, protecting the integrity of siding panels and reducing material waste during installation.

Specifications

• Brand: Simpson Strong-Tie
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel (Passivated)
• Gauge: 14
• Penny Size: 3d
• Length: 1-1/4 in.
• Head Diameter: 7/32 in.
• Head Type: Full Round Head
• Head Pattern: Circle Head
• Shank Type: Annular-Ring Shank
• Shank Diameter: 0.083 in.
• Point Type: Diamond Point
• Approx. Count Per Lb.: 470
• Country of Origin: United States

Available Pack Options

• T3KR71: 1 Lb (470)
• T3KR75: 5 Lb (2350)
• T3KR7B: 25 Lb (11750)

Approved Applications

• Fastening Wood Siding

Frequently Asked Questions

What makes Type 316 stainless steel better than standard stainless steel for siding nails?

Type 316 stainless steel contains molybdenum, which gives it superior resistance to chloride corrosion compared to standard 304 stainless steel. For siding in seaside locations or severely corrosive environments, this added protection helps prevent rust staining and fastener degradation that can compromise the appearance and structural integrity of the siding over time. These nails are also passivated, further enhancing that corrosion resistance at the surface level.

Why is an annular-ring shank important for siding applications?

An annular-ring shank features ridges along the shank that lock into wood fibers as the nail is driven. This significantly increases withdrawal resistance compared to a smooth shank nail. For wood siding, which expands and contracts with moisture and temperature changes, this holding power helps prevent nails from working loose or "popping" over the life of the installation.

What does "passivated" mean in relation to these stainless steel nails?

Passivation is a chemical treatment process that removes free iron and contaminants from the surface of stainless steel, promoting the formation of a stable, protective oxide layer. This enhances the corrosion resistance of the Type 316 stainless steel beyond its inherent properties, making these nails especially well-suited for harsh outdoor and marine environments.

How does the diamond point affect installation performance?

The diamond point is a blunt, symmetrical tip shape that drives straight and true into wood siding without wandering. It also reduces the likelihood of splitting boards during installation compared to sharper point styles - an important advantage when fastening finished siding panels where cracks or splits could damage the material and require costly replacement.

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