Simpson 16d 3-1/2" Wood Siding Nail in Type 304 Stainless Steel is engineered by Simpson Strong-Tie for reliable, long-lasting attachment of wood siding panels in exterior applications. Featuring an annular-ring shank for superior withdrawal resistance and a checkered full round head that blends naturally with wood grain, this 11-gauge nail delivers the holding power and pull-through resistance that exterior cladding demands. Whether you're installing wood siding on a new build or restoring an existing facade, this corrosion-resistant fastener is built to perform in outdoor environments where moisture and weathering are constant concerns.

Key Features

• Type 304 Stainless Steel material - provides strong corrosion resistance for exterior and outdoor siding applications, helping wood cladding stay securely fastened even in wet or humid conditions
• Annular-ring shank - dramatically increases withdrawal resistance compared to smooth-shank nails, reducing the risk of siding boards cupping, loosening, or pulling away from the substrate over time
• Checkered full round head - blends with wood grain for a cleaner finished appearance, reduces glare from sunlight, and accepts surface finishes so the nail head doesn't stand out visually on your siding installation
• Diamond point tip - makes driving easier and more accurate, helping installers work efficiently while reducing the chance of splitting the wood siding material
• 11-gauge, 3-1/2" length (16d penny size) - provides the shank diameter and penetration depth needed for secure fastening of wood siding panels with excellent pull-through resistance
• 1/4" head diameter - large enough to bear on siding without pulling through, while remaining discreet against the panel surface
• Made in the United States - manufactured to Simpson Strong-Tie's quality standards for consistent performance across your entire siding project

Why This Product

• Built for exterior wood siding where holding power matters most - the annular-ring shank grips the substrate far more tenaciously than smooth-shank alternatives, meaning siding boards stay flat and firmly attached through seasonal movement and weather cycles
• Type 304 stainless steel resists corrosion in demanding outdoor conditions - unlike galvanized or plain steel fasteners, stainless construction helps prevent rust streaking on siding surfaces and maintains structural integrity in consistently wet or high-humidity environments
• The checkered head pattern is designed specifically for wood siding aesthetics - it accepts paint and surface finishes so the fastener head integrates with the finished look of the siding, not against it
• Approximately 88 nails per pound - knowing the count per pound helps with accurate material planning so you can estimate quantity needs and minimize waste on your siding installation project

Specifications

• Brand: Simpson Strong-Tie
• Material: Type 304 Stainless Steel
• Finish: Type 304 Stainless Steel
• Penny Size: 16d
• Length: 3-1/2 in.
• Gauge: 11
• Shank Diameter: 0.120 in.
• Shank Type: Annular-Ring Shank
• Head Type: Full Round Head
• Head Diameter: 1/4 in.
• Head Pattern: Checkered
• Point Type: Diamond Point
• Approximate Count Per Lb: 88
• Country of Origin: United States

Available Pack Options

• S16SND1: 1 Lb (88)
• S16SND5: 5 Lb (440)
• S16SNDB: 25 Lb (2200)

Approved Applications

• Fastening Wood Siding

Frequently Asked Questions

Why is an annular-ring shank better than a smooth shank for wood siding installation?

An annular-ring shank has continuous rings along the nail body that grip the surrounding wood fibers after driving, providing significantly greater withdrawal resistance than a smooth-shank nail. For wood siding panels, this means the nail resists being pulled back out as the boards expand and contract with seasonal temperature and moisture changes, keeping the siding flat and securely attached over time.

Is Type 304 stainless steel suitable for all exterior siding environments?

Type 304 stainless steel offers strong corrosion resistance and is well suited for most exterior siding applications. For installations in seaside or coastal environments where exposure to salt air is a concern, a Type 316 stainless steel fastener may offer superior corrosion resistance. For standard outdoor and weather-exposed wood siding projects, Type 304 performs reliably.

What does the checkered head pattern do beyond appearance?

The checkered pattern on the full round head serves multiple practical purposes. It reduces glare from direct sunlight - a useful quality for exposed siding work - and the textured surface accepts paints and surface finishes, allowing the nail head to blend with the finished siding color or stain rather than standing out as a bright metal spot against the wood.

How many of these nails are there per pound, and why does that matter for planning?

There are approximately 88 of these 16d 3-1/2" stainless steel nails per pound. Knowing the approximate count per pound helps with material estimation when purchasing by weight - you can calculate how many pounds are needed based on the number of nails your siding installation requires, reducing over-ordering and helping you budget your project materials accurately.

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