Simpson 3d x 1-1/4" Annular Ring Shank Roofing Nail in 316 Stainless Steel is a professional-grade fastener engineered for demanding roofing applications where corrosion resistance and holding strength are non-negotiable. Built by Simpson Strong-Tie and made in the United States, this 10-gauge nail features a full round head for maximum bearing surface and an annular ring shank that bites deep into wood substrates for superior withdrawal resistance - making it a go-to choice for securing roofing materials in coastal, high-humidity, and chemically aggressive environments.

Key Features

• Type 316 Stainless Steel construction - delivers outstanding resistance to saltwater, chlorides, and harsh outdoor conditions, making this nail ideal for coastal roofing projects and marine-adjacent applications where standard galvanized nails would fail prematurely.
• Annular ring shank design - the ring-threaded shank dramatically increases withdrawal resistance compared to smooth-shank nails, keeping roofing materials firmly anchored to wood members and plywood roof decks even under wind uplift and thermal cycling.
• Full round head at 0.375" diameter - the large, flat bearing surface distributes load across a wider area of roofing material, reducing the risk of pull-through and ensuring a secure, weather-tight installation.
• 10-gauge shank at 0.131" diameter - a robust shank diameter provides structural integrity and minimizes bending or deformation during driving into dense substrate materials.
• 1-1/4" (3d) length - optimized for standard roofing material thicknesses, delivering reliable penetration depth into roof decking without over-driving.
• Diamond point tip - the sharp diamond point enables clean, precise entry into roofing substrates, reducing splitting risk and improving drive consistency.
• Smooth head pattern - the clean head face allows for flush seating and neat installation, maintaining a professional finish on exposed roofing fasteners.
• Made in the United States - domestic manufacturing supports consistent quality control and material traceability for demanding commercial and residential roofing projects.

Why This Product

• Built for corrosive environments - Type 316 stainless steel offers a higher level of corrosion protection than Type 304, making this nail the right specification choice for oceanfront roofing, pool enclosures, and other settings where moisture and salt exposure are constant concerns.
• Maximizes pull-out resistance - the annular ring shank is specifically designed to resist withdrawal forces, so roofing materials stay secured through high-wind events and seasonal expansion and contraction cycles.
• Engineered by a trusted structural fastener brand - Simpson Strong-Tie designs these nails to work in conjunction with roofing system requirements, giving contractors confidence in specification compliance and field performance.
• Reliable for both wood sheathing and plywood roof decks - the combination of gauge, length, and shank geometry makes this nail a versatile fastener for a range of common roofing substrate materials.

Specifications

• Brand: Simpson Strong-Tie
• Nail Type: Roofing Nail
• Coating/Material: Type 316 Stainless Steel
• Gauge: 10
• Penny Size: 3d
• Length: 1-1/4 in.
• Head Diameter: 0.375 in.
• Shank Diameter: 0.131 in.
• Shank Type: Annular-Ring Shank
• Head Type: Full Round Head
• Head Pattern: Smooth Head
• Point Type: Diamond Point
• Approx. Count per Lb.: 166
• Country of Origin: United States

Available Pack Options

• T310ARN1: 1 Lb
• T310ARN5: 5 Lb
• T310ARNB: 25 Lb

Frequently Asked Questions

What is the difference between Type 316 and Type 304 stainless steel for roofing nails?

Type 316 stainless steel contains added molybdenum, which gives it superior resistance to chlorides, saltwater, and industrial chemicals compared to Type 304. For roofing applications in coastal areas or environments with elevated moisture and chemical exposure, Type 316 is the more protective choice. Type 304 provides good general corrosion resistance for less aggressive environments.

Why use an annular ring shank instead of a smooth shank on roofing nails?

The annular rings along the shank act like threads, mechanically locking into wood fibers as the nail is driven. This significantly increases withdrawal resistance - meaning the nail resists being pulled out under wind uplift, vibration, or thermal movement - compared to a smooth-shank nail of the same length and gauge. For roofing material attachment to wood members and plywood decking, this added holding power improves long-term performance.

What does "approx. 166 count per pound" mean for planning purposes?

The approximate count per pound (166 for this 3d x 1-1/4" size) gives contractors and installers a reliable way to estimate quantity requirements by weight when purchasing in bulk. This figure is an average based on the nail's gauge, length, and material density, and may vary slightly within normal manufacturing tolerances.

Is a full round head important for roofing nail applications?

Yes - the full round head at 0.375" diameter provides a larger bearing surface than a clipped or offset head. This wider contact area helps prevent the nail head from pulling through roofing materials under stress, which is especially important when fastening softer or thinner substrates. The smooth head pattern also allows for clean, flush seating during installation.

Note: Product dimensions may differ from picture.