Simpson 3-1/2 inch 16d Annular Ring Shank Common Nail in Type 316 Stainless Steel is a heavy-duty fastener engineered for wood-to-wood fastening and framing applications where long-term holding strength and corrosion resistance are essential. Built from Type 316 stainless steel - the preferred alloy for seaside construction and harsh outdoor environments - this 8-gauge nail delivers the withdrawal resistance and structural integrity that demanding exterior projects require. The annular ring shank bites deep into wood fibers to resist pull-out forces, making it a dependable choice wherever a secure, lasting attachment is needed in exposed or moisture-prone conditions.

Key Features

• Annular ring shank design - increases withdrawal resistance by gripping wood fibers tightly, reducing the risk of fastener pull-out in structural framing and wood-to-wood connections
• Type 316 stainless steel construction - provides superior corrosion resistance against salt air, moisture, and harsh outdoor environments, making it the right choice for coastal and marine applications
• 8-gauge, 3-1/2 inch (16d) length - delivers the depth of penetration and shank strength needed for reliable framing connections in dimensional lumber
• Full round head (11/32 in. diameter) - maximizes bearing surface against the wood face, distributing load effectively and reducing the chance of the head pulling through
• Diamond point tip - allows the nail to start cleanly and drive straight with minimal wood splitting, improving installation speed and accuracy
• Made in the United States - manufactured domestically to meet consistent quality and dimensional standards expected from Simpson Strong-Tie fasteners

Why This Product

• Built for coastal and wet-environment construction - Type 316 stainless steel offers a higher level of corrosion resistance than standard stainless or galvanized options, making these nails especially well-suited for seaside structures, docks, decks, and any application exposed to salt air or standing moisture
• The annular ring shank works where smooth-shank nails fall short - when fastening wood in conditions where movement, shrinkage, or vibration could loosen standard nails, the ring shank profile provides increased mechanical withdrawal resistance for a connection that holds over time
• A trusted fastener brand with a purpose-built exterior line - Simpson Strong-Tie engineered this nail specifically for outdoor and structural use, so builders and contractors can specify it with confidence on projects where fastener performance is a code or design consideration
• Approximately 44 nails per pound - knowing the count-per-pound makes it straightforward to estimate material quantities for framing and wood fastening jobs, reducing waste and over-ordering

Specifications

• Brand: Simpson Strong-Tie
• Length: 3-1/2 in.
• Penny Size: 16d
• Gauge: 8
• Shank Type: Annular-Ring Shank
• Shank Diameter: 0.162 in.
• Head Type: Full Round Head
• Head Diameter: 11/32 in.
• Point Type: Diamond Point
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Approx. Count per Lb.: 44
• Country of Origin: United States

Available Pack Options

• T16ACN1: 1 Lb (44)
• T16ACN5: 5 Lb (220)
• T16ACNB: 25 Lb (1100)

Approved Applications

• Fastening Wood-to-Wood
• Framing - Wood

Frequently Asked Questions

What makes Type 316 stainless steel a better choice for exterior nails than standard stainless steel?

Type 316 stainless steel contains higher levels of alloying elements that provide superior resistance to corrosion from salt water, chemicals, and prolonged moisture exposure compared to standard grades. Simpson specifically recommends Type 316 for seaside applications and any construction environment where corrosion resistance is a critical performance requirement.

How does an annular ring shank differ from a smooth shank, and why does it matter?

An annular ring shank features continuous ridges running around the nail's diameter. As the nail is driven, those rings grip the surrounding wood fibers mechanically, significantly increasing withdrawal resistance compared to a smooth-shank common nail. This makes the annular ring shank an important feature for structural framing and wood-to-wood fastening where pull-out forces are a concern.

What head type and point type does this nail use, and how do they affect installation?

This nail features a full round head measuring 11/32 in. in diameter, which provides a broad bearing surface to hold the fastened material securely and resist pull-through. The diamond point tip allows the nail to penetrate wood cleanly and drive in a straight line, helping to reduce splitting and improve overall installation accuracy.

What types of projects are these nails designed for?

These nails are designed for wood-to-wood fastening and wood framing applications. Their Type 316 stainless steel construction makes them particularly well suited for exterior, coastal, and other harsh-environment projects where long-term corrosion resistance and structural holding power are required.