Simpson 16d 3-1/2" Wood Siding Nail in Type 316 Stainless Steel is engineered by Simpson Strong-Tie for demanding exterior fastening applications where corrosion resistance and long-term holding power are essential. Designed specifically for fastening wood siding panels, this 11-gauge nail features an annular ring shank that locks into the substrate for superior withdrawal resistance, keeping siding boards secure and flat over time. The checker-patterned full round head blends naturally with wood grain, resists sunlight glare, and accepts surface finishes - making it the right choice for both functional performance and clean aesthetics on exterior wood cladding projects. Manufactured in the United States, this nail brings professional-grade reliability to wood siding installations in coastal, high-humidity, and chemically aggressive environments.

Key Features

• Type 316 Stainless Steel material - delivers superior corrosion resistance compared to standard stainless grades, making these nails well-suited for seaside applications, salt air exposure, and harsh outdoor environments where inferior fasteners would fail prematurely
• Annular ring shank - dramatically increases withdrawal resistance so siding boards stay firmly anchored and resist cupping, warping, and loosening over years of seasonal movement
• Checkered full round head (1/4" diameter) - the checker pattern blends with wood grain texture, reduces reflective glare from sunlight, and accepts paint, stain, or other surface finishes for a finished appearance that hides the fastener
• Diamond point tip - enables easier, more precise driving into wood siding panels, reducing splitting risk and improving installation speed
• 11-gauge, 3-1/2" length (16d penny size) - provides the shank diameter and penetration depth needed for strong pull-through resistance when securing full-thickness wood siding panels to structural framing
• Made in the United States - consistent quality control and material traceability for projects requiring domestically sourced fasteners

Why This Product

• Built for coastal and high-exposure installations: Type 316 stainless steel is the correct specification for seaside and salt-air environments where standard galvanized or 304 stainless nails are prone to rust staining and corrosion failure - protecting both the fastener and the siding material over the long term
• Resists siding board movement and pull-through: The annular ring shank provides mechanical interlock with wood fibers, resisting the withdrawal forces and board cupping that commonly result from seasonal moisture changes in exterior wood siding
• Finish-ready head for clean exterior aesthetics: The checker-patterned head was specifically designed to accept surface finishes and minimize glare, so the nail disappears into the siding rather than standing out as a visible blemish
• Trusted Simpson Strong-Tie engineering: Part of a purpose-built line of exterior fasteners from Simpson Strong-Tie, designed to meet the performance requirements of wood siding applications with a focus on long-lasting attachment in outdoor living spaces

Specifications

• Brand: Simpson Strong-Tie
• Finish / Material: Type 316 Stainless Steel
• Gauge: 11
• Penny Size: 16d
• Length: 3-1/2 in.
• Head Diameter: 1/4 in.
• Head Type: Full Round Head
• Head Pattern: Checkered
• Shank Diameter: 0.120 in.
• Shank Type: Annular-Ring Shank
• Point Type: Diamond Point
• Approx. Count Per Lb: 88
• Country of Origin: United States

Available Pack Options

• T16SND5: 5 Lb (440)
• T16SNDB: 25 Lb (2200)

Approved Applications

• Fastening Wood Siding

Frequently Asked Questions

Why choose Type 316 stainless steel for wood siding nails instead of standard stainless or galvanized options?

Type 316 stainless steel offers superior corrosion resistance compared to standard grades, making it the correct choice for seaside applications and environments with high salt air, moisture, or chemical exposure. Simpson Strong-Tie specifically recommends these nails for exterior applications where long-term corrosion resistance is critical to protecting both the fastener and the surrounding siding material.

What is the purpose of the annular ring shank on this nail?

The annular ring shank increases withdrawal resistance by mechanically interlocking with wood fibers as the nail is driven. This provides a more secure attachment than a smooth-shank nail and helps reduce cupping of siding boards - a common problem caused by seasonal wood movement in exterior applications.

How does the checkered head pattern benefit a wood siding installation?

The checker pattern on the full round head serves three practical purposes: it blends with the natural texture of wood grain so the nail head is less visually prominent, it reduces glare from sunlight that a smooth head would reflect, and it accepts paint, stain, or other surface finishes so the fastener can be finished to match the siding for a clean final appearance.

What nail specifications make this fastener appropriate for wood siding panels?

This nail is 3-1/2 inches long (16d penny size), 11 gauge, with a 0.120-inch shank diameter and a 1/4-inch full round head. The combination of length and annular ring shank provides the penetration depth and holding power needed for excellent pull-through resistance when securing wood siding panels to structural framing.

Note: Product dimensions may differ from picture. Please refer to the specifications listed above for exact measurements.