Simpson 8d 2-1/2" Type 316 Stainless Steel Wood Siding Nail by Simpson Strong-Tie is engineered for secure, long-lasting attachment of wood siding panels in demanding outdoor and coastal environments. Featuring an annular-ring shank for superior withdrawal resistance and a checkered full round head that blends seamlessly with wood grain, this nail delivers the holding power and pull-through resistance needed to keep siding boards flat, stable, and firmly in place - even in high-moisture and salt-air conditions where standard nails would corrode and fail.

Key Features

• Type 316 Stainless Steel material - provides superior corrosion resistance in seaside, coastal, and harsh outdoor environments where saltwater and chemicals are present, giving wood siding installations a long service life
• Annular-ring shank - dramatically increases withdrawal resistance compared to smooth-shank nails, reducing cupping of siding boards and keeping panels securely anchored over time
• Checkered full round head pattern - blends with wood grain texture, reduces glare from sunlight, and accepts surface finishes so the fastener visually disappears into the siding
• Diamond point tip - allows easier driving through wood siding panels, reducing installer effort and the risk of splitting the material at the point of entry
• 13-gauge, 0.092" shank diameter - sized appropriately for wood siding fastening, delivering a balance of holding strength and minimal surface disruption
• 2-1/2" length (8d penny size) - provides adequate penetration depth for secure attachment of standard wood siding panels to wall sheathing or framing
• Made in the United States - manufactured domestically to Simpson Strong-Tie's quality standards for structural fasteners

Why This Product

• The Type 316 stainless steel finish goes beyond standard galvanized protection - it is the preferred choice for oceanfront and seaside wood siding projects where salt air and moisture accelerate corrosion on lesser fasteners
• The annular-ring shank design solves one of the most common wood siding problems - boards cupping and pulling away over time - by creating mechanical lock between the nail and the wood fiber for a grip that smooth shanks cannot match
• The checkered head pattern addresses a finishing concern that matters to contractors and homeowners alike: the nail head accepts stain or paint so it does not stand out as a bright spot against the siding surface
• At 196 nails per pound, this is a high-count fastener well suited for siding projects that require a large volume of consistent, corrosion-resistant attachments without compromise on performance

Specifications

• Brand: Simpson Strong-Tie
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Penny Size: 8d
• Length: 2-1/2 in.
• Gauge: 13
• Shank Diameter: 0.092 in.
• Shank Type: Annular-Ring Shank
• Head Type: Full Round Head
• Head Diameter: 5/32 in.
• Head Pattern: Checkered
• Point Type: Diamond Point
• Approximate Count Per Lb: 196
• Country of Origin: United States

Available Pack Options

• T8SND1: 1 Lb (196)
• T8SND5: 5 Lb (980)
• T8SNDB: 25 Lb (4900)

Approved Applications

• Fastening Wood Siding

Frequently Asked Questions

Why should I use Type 316 stainless steel nails instead of standard galvanized nails for wood siding?

Type 316 stainless steel offers a higher level of corrosion resistance than standard galvanized finishes, making it the recommended choice for seaside and coastal applications where salt air and moisture are present. For exterior wood siding, this means the fastener remains structurally sound and visually clean over the long term without rust staining the siding surface.

What does the annular-ring shank do that a smooth-shank nail does not?

The annular-ring shank creates a mechanical interlock with the wood fibers as the nail is driven, significantly increasing withdrawal resistance. This prevents the nail from backing out over time due to wood movement, temperature cycling, or moisture changes - which directly reduces the cupping and buckling of siding boards that can occur with smooth-shank fasteners.

Will the checkered head pattern be visible after the siding is painted or stained?

The checkered head pattern is specifically designed to blend with wood grain texture and to accept surface finishes including paint and stain. It also reduces glare from sunlight compared to a polished flat head, so the fastener integrates visually into the finished siding surface.

Is this nail compatible with hand nailing and pneumatic nail guns?

These are collated-loose, hand-drive nails sold as individual fasteners. Their diamond point tip facilitates easier manual driving. For pneumatic tool compatibility, always verify your tool's specifications against the nail's 13-gauge, 0.092" shank diameter and 2-1/2" length before use.

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