Simpson Strong-Tie 3d x 1-1/4" Annular Ring Shank Roofing Nail in Type 304 Stainless Steel delivers the holding power and corrosion resistance that roofing professionals demand. Engineered with an annular ring shank that dramatically increases withdrawal resistance, this 11-gauge nail locks firmly into wood members and plywood roof decks - keeping roofing materials securely in place even under demanding conditions. The full round, smooth head with a 3/8" diameter provides generous bearing surface to grip and hold roofing materials flat, while the diamond point drives cleanly through substrates with minimal splitting. Made in the United States from Type 304 stainless steel, these roofing nails are built for long-term performance in corrosive outdoor environments.

Key Features

• Annular ring shank - increases withdrawal resistance so the nail stays anchored in wood decking and structural members, reducing the risk of fastener pullout over time
• Full round smooth head with 3/8" diameter - provides extra bearing surface to firmly secure roofing material and distribute load evenly, preventing tear-through
• Type 304 stainless steel construction - delivers higher levels of corrosion resistance compared to uncoated or standard galvanized fasteners, making it well-suited for outdoor roofing applications exposed to moisture and weathering
• Diamond point tip - pierces roofing substrates cleanly and efficiently, allowing for faster driving with less effort and reduced material damage
• 11-gauge, 0.120" shank diameter - provides the structural strength needed for reliable roofing fastening without being overly bulky
• 3d penny size, 1-1/4" length - a practical nail length for securing roofing materials to standard decking, optimizing hold without over-penetration
• Made in the United States - manufactured to consistent quality standards, providing confidence in dimensional accuracy and material integrity

Why This Product

• The annular ring shank design directly addresses one of roofing's core challenges - fastener withdrawal - by mechanically interlocking with wood fibers to resist pullout forces that smooth shank nails cannot match
• Type 304 stainless steel construction means these nails resist rust, staining, and corrosion in outdoor roofing environments where standard nails can fail prematurely due to moisture exposure
• The large, flat full round head prevents the nail from pulling through roofing material under load, providing a more secure and lasting attachment to the roof deck
• Approximately 199 nails per pound gives roofing professionals a reliable reference for estimating material quantities needed for any roofing project

Specifications

• Brand: Simpson Strong-Tie
• Material: Type 304 Stainless Steel
• Finish: Type 304 Stainless Steel
• Gauge: 11
• Penny Size: 3d
• Length: 1-1/4 in.
• Head Diameter: 3/8 in.
• Shank Diameter: 0.120 in.
• Shank Type: Annular-Ring Shank
• Head Type: Full Round Head
• Head Pattern: Smooth Head
• Point Type: Diamond Point
• Approx. Count Per Lb: 199
• Country of Origin: United States

Available Pack Options

• S311ARN5: 5 Lb
• S311ARNB: 25 Lb

Approved Applications

• Roofing

Frequently Asked Questions

What makes an annular ring shank better than a smooth shank for roofing applications?

The annular ring shank features rings along the shank that interlock with wood fibers as the nail is driven in. This mechanical engagement significantly increases withdrawal resistance compared to a smooth shank nail, helping keep roofing materials firmly secured to the deck over time and under the stresses of wind, temperature changes, and foot traffic.

Why is Type 304 stainless steel recommended for roofing nails?

Type 304 stainless steel provides higher levels of corrosion resistance than standard uncoated or lightly galvanized fasteners. Roofing environments expose nails to ongoing moisture, rain, and temperature cycling - conditions that can cause corrosion in lower-grade fasteners. Using Type 304 stainless steel helps maintain fastener integrity and appearance over the long term.

What is the head diameter of this roofing nail, and why does it matter?

This nail features a full round smooth head with a 3/8" (0.375") diameter. The larger head provides extra bearing surface that distributes holding force over a wider area of the roofing material, reducing the chance of the nail head pulling through and improving the overall security of the installation.

How many of these nails are in a pound?

There are approximately 199 nails per pound. This count-per-pound figure is useful for estimating how much product is needed based on your project's fastener requirements.

Note: Product dimensions may differ from picture.