Simpson 3-1/4" 12d Finishing Nail in 316 Stainless Steel is a premium fastener built for longevity in the most demanding and corrosive environments. Crafted from 11-gauge Type 316 stainless steel, this finishing nail delivers exceptional resistance to saltwater, coastal moisture, chemicals, and harsh outdoor conditions - making it the go-to choice for seaside construction, exterior trim work, and any application where long-term fastener integrity is critical. The brad head design keeps the nail nearly invisible at the surface, while the smooth shank and diamond point allow for clean, controlled driving with minimal splitting.

Key Features

• Type 316 stainless steel construction - provides superior corrosion resistance compared to standard stainless grades, ideal for coastal and marine environments where saltwater exposure is a constant concern
• 11-gauge shank diameter - delivers reliable holding strength in finish carpentry applications without excessive bulk
• 3-1/4" length (12d penny size) - penetrates deeply enough for solid fastening in trim, molding, and finish woodworking projects
• Brad head (0.165" head diameter) - minimally larger than the shank, allowing the nail to be countersunk and concealed beneath the work surface for a clean, professional appearance
• Smooth shank with diamond point - reduces driving resistance, making installation easier and minimizing the risk of splitting surrounding material
• Made in the United States - consistent manufacturing standards you can rely on for critical structural and finish applications

Why This Product

• Built for corrosive environments where standard fasteners fail - Type 316 stainless steel is specifically formulated for superior resistance to chlorides, salt spray, and harsh chemicals, making these nails a smart long-term investment in coastal, marine, and high-humidity applications
• Finish work that stays hidden - the brad head is only slightly larger than the 0.12" shank diameter, so countersinking leaves virtually no visible trace, protecting the aesthetics of trim, millwork, and cabinetry
• The fastener outlasts the material it joins - using 316 stainless steel ensures the nail will not corrode and stain surrounding wood or composite materials before the substrate itself needs replacement
• Smooth shank and diamond point reduce installation effort - these design features work together to make driving cleaner and faster, especially in hardwoods or dense trim materials

Specifications

• Brand: Simpson Strong-Tie
• Coating/Material: Type 316 Stainless Steel
• Gauge: 11
• Penny Size: 12d
• Length: 3-1/4 in.
• Head Diameter: 0.165 in.
• Shank Diameter: 0.12 in.
• Shank Type: Smooth Shank
• Head Type: Brad Head
• Head Pattern: Smooth Head
• Point Type: Diamond Point
• Approx. Count per Lb.: 97
• Country of Origin: United States

Available Pack Options

• T12FN1: 1 Lb (97)
• T12FN5: 5 Lb (485)

Frequently Asked Questions

What makes Type 316 stainless steel better for outdoor or coastal use than other stainless grades?

Type 316 stainless steel contains molybdenum, which significantly improves its resistance to chlorides, salt spray, and acidic chemicals. This makes it particularly well-suited for seaside applications, coastal construction, and environments where moisture and salt are persistent - situations where standard stainless or galvanized fasteners would corrode far more quickly.

What does "12d" mean, and how does it relate to nail length?

The "d" designation is a traditional penny-size system used in the nail industry to classify nail length. A 12d nail corresponds to a length of 3-1/4 inches, which is the length of this finishing nail. This sizing is a widely recognized standard in carpentry and construction.

How do I conceal this finishing nail after driving it?

This nail features a brad head that is only slightly larger than the shank - with a 0.165" head diameter compared to a 0.12" shank diameter. That small profile allows you to countersink the nail below the wood surface using a nail set, then fill the small depression with wood filler or putty for a clean, invisible finish.

What type of applications is this 3-1/4" finishing nail best suited for?

This nail is well suited for finish carpentry tasks such as installing trim, molding, cabinetry, and other interior or exterior finish woodwork - particularly in environments prone to moisture, humidity, or salt exposure. The smooth shank and diamond point make it easier to drive without splitting, and the 316 stainless steel ensures the fastener remains structurally sound and stain-free over time.

Note: Product dimensions may differ from picture.