Simpson 8d 0.131 x 2-1/2" Preservative-Treated Wood Decking Nail in Type 316 Stainless Steel from Simpson Strong-Tie is an exterior fastening solution engineered for deck and dock construction where long-term durability and corrosion resistance are critical. The annular-ring shank design delivers superior withdrawal resistance, helping keep nail heads from working up through the decking surface over time - even in demanding outdoor conditions. Crafted entirely from Type 316 stainless steel, this decking nail is the right choice for seaside and coastal applications where saltwater exposure, moisture, and chemicals would compromise lesser fasteners. Its larger shank diameter allows straightforward penetration into both green and seasoned preservative-treated pine, reducing splitting and installation effort.

Key Features

• Type 316 stainless steel material - provides superior corrosion resistance in saltwater, coastal, and chemically treated lumber environments, giving outdoor structures lasting protection against the elements
• Annular-ring shank - increases withdrawal resistance compared to smooth-shank nails, helping prevent nail heads from popping up over years of use in decking projects
• Larger 0.131" shank diameter (10 gauge) - allows easy driving into both green and seasoned preservative-treated pine without pre-drilling, speeding up installation on deck and dock builds
• Checkered full round head pattern - blends naturally with wood grain texture and reduces glare from direct sunlight, delivering a cleaner finished appearance on decking surfaces
• Diamond point tip - promotes easier, more controlled driving with less effort, reducing installer fatigue on large decking projects
• 2-1/2" length (8d penny size) - sized appropriately for standard deck board fastening, providing solid holding power through decking into structural framing members
• Made in the United States - manufactured domestically for consistent quality and dimensional accuracy across every nail

Why This Product

• When preservative-treated lumber is used outdoors, ordinary nails can corrode rapidly and stain surrounding wood - Type 316 stainless steel resists exactly these conditions, making this nail the right match for pressure-treated pine decks and docks exposed to moisture and chemicals
• The annular-ring shank addresses a common deck maintenance headache: nails backing out and creating raised heads that can snag feet and damage boards - the increased withdrawal resistance keeps fasteners firmly in place over the life of the structure
• For builders working near salt water, harbors, or marine environments, Type 316 stainless steel offers greater resistance to chloride-induced corrosion than Type 304 stainless or standard galvanized options - making these nails a purpose-built choice for coastal applications
• The combination of diamond point tip and larger shank diameter means faster, smoother installation into both fresh green lumber and dried seasoned preservative-treated pine, reducing project time and the risk of wood splitting

Specifications

• Brand: Simpson Strong-Tie
• Penny Size: 8d
• Length: 2-1/2 in.
• Shank Diameter: 0.131 in.
• Gauge: 10
• Shank Type: Annular-Ring Shank
• Head Type: Full Round Head
• Head Diameter: 9/32 in.
• Head Pattern: Checkered
• Point Type: Diamond Point
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Approx. Count per Lb.: 94
• Country of Origin: United States

Available Pack Options

• T8HPTD1: 1 Lb (94)
• T8HPTD5: 5 Lb (470)
• T8HPTDB: 25 Lb (2350)

Approved Applications

• Deck construction using preservative-treated pine lumber
• Dock construction and marine-adjacent structures
• Exterior fastening into green or seasoned pressure-treated wood
• Coastal and seaside outdoor living projects requiring superior corrosion resistance

Frequently Asked Questions

Why is Type 316 stainless steel recommended for decking nails rather than Type 304 or galvanized?

Type 316 stainless steel contains molybdenum, which provides greater resistance to chlorides and harsh chemicals - making it especially well-suited for seaside, coastal, and marine environments where saltwater exposure is a concern. It also holds up against the preservative chemicals used in treated lumber, which can corrode standard galvanized fasteners over time and cause staining on the wood surface.

What makes the annular-ring shank better for deck applications compared to a smooth shank?

The annular-ring shank features rings along the nail's shank that grip the wood fibers tightly and significantly increase withdrawal resistance. In decking applications, this means the nail resists backing out over repeated cycles of moisture, temperature changes, and foot traffic - helping prevent the raised nail heads that are both a safety hazard and a sign of fastener failure.

Can this nail be driven into green (freshly milled) preservative-treated lumber?

Yes. The larger 0.131" shank diameter and diamond point are specifically designed to allow easy installation into both green and seasoned preservative-treated pine, so there is no need to wait for lumber to dry before fastening.

What does the checkered head pattern offer beyond appearance?

The checkered pattern on the full round head serves two practical purposes: it blends visually with the natural texture of wood grain for a cleaner finished look on decking surfaces, and it reduces glare from sunlight reflecting off the nail head - a detail that matters on large, exposed deck surfaces in bright outdoor environments.

Note: Product dimensions may differ from picture.