Simpson 3d x 1-1/4" Annular Ring Shank Roofing Nail in 316 Stainless Steel (11 Gauge) by Simpson is a heavy-duty roofing fastener engineered for superior holding power and long-term corrosion resistance in demanding outdoor and marine environments. The annular ring shank design mechanically locks into wood substrates, dramatically increasing withdrawal resistance compared to smooth-shank alternatives - making this nail a dependable choice for securing roofing materials to wood members and plywood roof decks. Built from Type 316 stainless steel at 11 gauge, this fastener delivers the strength and durability required for coastal, high-moisture, and chemically exposed roofing applications.

Key Features

• Type 316 stainless steel construction - provides exceptional resistance to saltwater, harsh chemicals, and prolonged moisture exposure, making this nail well-suited for coastal and marine roofing environments where standard fasteners would corrode prematurely.
• Annular ring shank geometry - the circular rings along the shank grip wood fibers as the nail is driven, dramatically increasing withdrawal resistance and keeping roofing materials firmly anchored over time.
• Full round, large flat head (0.344" diameter) - the wide bearing surface distributes load across roofing material, reducing the risk of the nail pulling through and providing a secure, stable hold on shingles, felt, and other roofing substrates.
• Diamond point tip - the sharp, tapered point allows the nail to penetrate roofing materials and wood decking cleanly and efficiently, reducing splitting and making installation faster.
• 11 gauge shank diameter (0.120") - provides robust shank strength to handle the mechanical demands of roofing fastening without sacrificing drivability through standard roofing materials.
• Smooth head pattern - the clean, flush head sits flat against roofing material for a neat, professional finish that minimizes snagging or tearing of overlapping materials.
• 1-1/4" (3d) length - sized appropriately for standard roofing applications, delivering adequate penetration into roof decking while keeping the nail profile low-profile beneath roofing layers.
• Made in the United States - domestic manufacture supports consistent quality control and dimensional accuracy across every nail.

Why This Product

• Built for environments that destroy standard nails - Type 316 stainless steel is specifically chosen for its resistance to chloride-rich and chemically aggressive environments, making this the right fastener for coastal roofing, humid climates, and applications near salt air where galvanized or standard steel nails would rust and fail.
• Annular ring shank means the nail stays put - the mechanical interlocking of the ring shank with wood fibers provides far greater withdrawal resistance than a smooth-shank nail, so roofing materials remain securely fastened under wind uplift and long-term thermal movement.
• Engineered geometry reduces installer callbacks - the combination of full round head, annular ring shank, and diamond point means roofing materials are held firmly, driven cleanly, and seated properly the first time, reducing the likelihood of blow-off or fastener failure over the life of the roof.
• Trusted Simpson quality in a critical application - Simpson is a recognized name in structural fasteners and connectors, and this nail reflects the same attention to material selection and dimensional consistency applied to their broader product line.

Specifications

• Brand: Simpson Strong-Tie
• Coating/Material: Type 316 Stainless Steel
• Gauge: 11
• Penny Size: 3d
• Length: 1-1/4 in.
• Head Diameter: 0.34375 in.
• Shank Diameter: 0.12 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

• T311ARN-RP30: 30 Pk
• T311ARN1: 1 Lb
• T311ARN-RP110: 110 Pk
• T311ARNB: 25 Lb

Frequently Asked Questions

What makes Type 316 stainless steel a better choice for roofing nails than standard or galvanized options?

Type 316 stainless steel contains molybdenum, which gives it superior resistance to chlorides, salt air, and many chemicals compared to standard stainless or galvanized steel. This makes it particularly effective in coastal, marine, and high-humidity roofing environments where corrosion from moisture and salt exposure would degrade lower-grade fasteners over time, potentially compromising the roof attachment.

Why is an annular ring shank preferred over a smooth shank for roofing nails?

The annular ring shank has ridges along its length that mechanically interlock with wood fibers as the nail is driven. This dramatically increases withdrawal resistance - the force required to pull the nail back out - compared to a smooth-shank nail of the same size. In roofing applications, where wind uplift and thermal cycling place repeated stress on fastener connections, the annular ring shank keeps roofing materials anchored more reliably over the long term.

What does the "3d" penny size designation mean, and how does it relate to nail length?

"3d" is a traditional nail sizing designation (penny size) that corresponds to a nail length of 1-1/4 inches. The penny system is a historical convention still widely used in the fastener industry to describe nail size. For this product, 3d and 1-1/4 in. refer to the same dimension.

How many nails are in a pound of these 3d x 1-1/4" annular ring shank roofing nails?

There are approximately 199 nails per pound. Because these are 11 gauge Type 316 stainless steel nails, they are denser than comparable aluminum or lighter-gauge fasteners, so estimating quantity by weight is straightforward using this count. Keep in mind this is an approximate count per pound, and minor variation is normal.

Note: Product dimensions may differ from picture.