Simpson 1-1/2 in. 4d Annular Ring Shank Common Nail in Type 316 Stainless Steel is a heavy-duty fastener engineered for wood-to-wood connections and framing applications where corrosion resistance and long-term holding power are critical. Built from Type 316 stainless steel and featuring a 12-gauge shank with an annular ring profile, this nail delivers exceptional withdrawal resistance - making it a reliable choice for outdoor framing, coastal construction, and applications exposed to moisture or harsh environmental conditions.

Key Features

• Type 316 Stainless Steel material - provides superior corrosion resistance compared to standard steel, making these nails well suited for seaside environments, wet conditions, and chemically aggressive settings where ordinary fasteners would degrade prematurely.
• Annular ring shank design - the ringed shank profile dramatically increases withdrawal resistance compared to smooth shank nails, locking firmly into wood fibers and reducing the risk of loosening over time under load or movement.
• 12-gauge shank at 0.113 in. diameter - delivers a robust cross-section that resists bending and buckling during installation, giving confident, straight driving into framing lumber.
• Full round head at 1/4 in. diameter - distributes clamping force across a wider bearing surface, reducing the risk of the nail pulling through the material and improving overall joint integrity.
• Diamond point tip - the sharp, tapered point starts cleanly and drives with less splitting force, helping protect wood integrity especially near edges and end grain.
• 1-1/2 in. length (4d penny size) - sized to penetrate adequately through standard sheathing and light framing members without over-driving or blowing through thinner materials.
• Made in the United States - domestic manufacturing supports consistent quality control and material traceability for professional and code-sensitive projects.

Why This Product

• Built for coastal and high-humidity environments: Type 316 stainless steel contains molybdenum, giving it a step up in resistance to chloride-rich salt air and moisture - a practical advantage for decking, docks, and outdoor framing near water where standard fasteners rust and stain.
• Annular ring shank holds where smooth shanks slip: When wood expands, contracts, or is subject to wind and vibration loads, smooth nails can back out. The ringed shank profile grips wood fibers mechanically, maintaining connection integrity over years of service.
• Designed for wood framing applications: With a full round head, consistent 12-gauge body, and diamond point, this nail is purpose-built to perform in wood-to-wood fastening and structural framing contexts where both drive performance and pull-through resistance matter.
• Approximately 228 nails per pound: The known count per pound makes estimating material quantities for framing and sheathing jobs straightforward, helping to plan purchases accurately without overbuying or running short.

Specifications

• Brand: Simpson Strong-Tie
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Gauge: 12
• Penny Size: 4d
• Length: 1-1/2 in.
• Head Type: Full Round Head
• Head Diameter: 1/4 in.
• Shank Type: Annular-Ring Shank
• Shank Diameter: 0.113 in.
• Point Type: Diamond Point
• Approx. Count Per Lb: 228
• Country of Origin: United States

Available Pack Options

• T4ACN1: 1 Lb (228)
• T4ACN5: 5 Lb (1140)
• T4ACNB: 25 Lb (5700)

Approved Applications

• Fastening Wood-to-Wood
• Framing - Wood

Frequently Asked Questions

What makes Type 316 stainless steel different from Type 304 for nail applications?

Type 316 stainless steel contains molybdenum, which gives it enhanced resistance to chlorides and salt exposure compared to Type 304. This makes it the preferred choice for seaside, marine-adjacent, and coastal framing applications where fasteners face prolonged exposure to salt air or moisture.

What is the benefit of an annular ring shank versus a smooth shank nail?

The annular ring shank features a series of rings along the nail body that grip into wood fibers as the nail is driven. This dramatically increases withdrawal resistance - meaning the nail resists being pulled back out - compared to a smooth shank nail of the same length and gauge. This is especially valuable in applications subject to movement, vibration, or seasonal wood expansion and contraction.

What types of wood framing and fastening tasks are these nails designed for?

These 1-1/2 in. common nails are suited for wood-to-wood fastening and wood framing applications. Their 12-gauge diameter, full round head, and diamond point make them appropriate for attaching sheathing, light framing members, and similar structural or exterior carpentry tasks.

How many nails are in a pound, and why does that matter?

There are approximately 228 nails per pound for this size and gauge. Knowing the count per pound makes it practical to estimate how many nails are needed for a framing or sheathing project based on weight purchased, reducing guesswork and helping ensure you have an adequate supply on hand.