Simpson 1-1/4" 3d Finishing Nail in 316 Stainless Steel is a premium 15-gauge fastener engineered for finish carpentry, trim work, and any application where long-term durability in demanding environments is essential. Crafted from Type 316 stainless steel - the grade recognized for superior resistance to saltwater, moisture, and corrosive conditions - these finishing nails deliver a clean, nearly invisible result while standing up to the harshest coastal and outdoor settings. Made in the United States by Simpson, a trusted name in structural and finish fasteners, these nails combine refined aesthetics with lasting performance.

Key Features

• Type 316 stainless steel construction - provides superior corrosion resistance against saltwater, humidity, and harsh chemicals, making these nails ideal for seaside, exterior, and wet-environment applications where ordinary fasteners would fail prematurely.
• 15-gauge wire diameter with 0.072" shank - delivers a fine shank profile that minimizes wood splitting when driving into trim, millwork, and delicate finish surfaces.
• Brad head design with 0.109" head diameter - the head is only slightly larger than the shank, allowing it to be countersunk below the work surface and easily concealed with filler for a clean, professional finish.
• Smooth shank - drives cleanly and consistently into finish materials without tearing or roughing up surrounding wood fibers, preserving the appearance of finished surfaces.
• Diamond point tip - the sharp, tapered point makes starting and driving easier, reducing the effort needed and helping prevent blowout on thin or delicate trim pieces.
• 1-1/4" length (3d penny size) - sized for finish trim, interior molding, cabinet work, and other applications requiring a discreet, shorter fastener with solid holding power.

Why This Product

• Built for coastal and corrosive environments - Type 316 stainless steel offers a meaningful upgrade over standard stainless or galvanized nails, resisting pitting and rust even in salt air and direct moisture exposure, so fasteners last as long as the materials they secure.
• Virtually invisible after installation - the brad head and narrow shank make countersinking simple, allowing tradespeople to achieve a smooth, paint-ready finish without large filled holes or unsightly nail marks.
• Precision sizing for fine finish work - at 1-1/4" long and 15 gauge, these nails are proportioned specifically for thin trim, molding, and cabinetry where heavier fasteners would cause splitting or damage delicate profiles.
• American-made quality from Simpson - manufactured in the United States, these nails meet consistent quality standards relied upon by finish carpenters, contractors, and builders on projects where material failure is not acceptable.

Specifications

• Brand: Simpson Strong-Tie
• Nail Type: Finishing Nail
• Material/Coating: Type 316 Stainless Steel
• Gauge: 15
• Penny Size: 3d
• Length: 1-1/4 in.
• Head Diameter: 0.109 in.
• Shank Diameter: 0.072 in.
• Shank Type: Smooth Shank
• Head Type: Brad Head
• Head Pattern: Smooth Head
• Point Type: Diamond Point
• Approx. Count per Lb.: 649
• Country of Origin: United States

Available Pack Options

• T3FN1: 1 Lb (649)
• T3FN5: 5 Lb (3245)
• T3FNB: 25 Lb (16225)

Frequently Asked Questions

Why should I choose Type 316 stainless steel over Type 304 stainless steel for finishing nails?

Type 316 stainless steel contains molybdenum, which gives it enhanced resistance to chloride corrosion - making it the preferred choice for seaside, marine, and high-humidity applications where Type 304 may still show surface rust or pitting over time. If your project is near the ocean or exposed to salt air, Type 316 is the more durable long-term choice.

Can these nails be used with a nail gun, or are they hand-drive only?

These are bulk finishing nails sold as collated strips are not described in the product data. They are individual wire nails and are typically hand-driven or used with compatible nail-driving equipment designed for 15-gauge wire nails of this gauge and length. Always verify compatibility with your specific tool before use.

How do I conceal these nails after installation?

The brad head design - with a 0.109 in. head diameter only slightly larger than the 0.072 in. shank - is specifically intended for countersinking. Drive the nail slightly below the wood surface using a nail set, then fill the small recess with a compatible wood filler, putty, or caulk and finish as needed for a smooth, nearly invisible result.

What types of projects are these 1-1/4" finishing nails best suited for?

At 1-1/4" in length with a slim 15-gauge profile and smooth shank, these nails are well-suited for interior and exterior finish trim, window and door casing, baseboards, crown molding, cabinet face frames, and other fine finish carpentry work where a clean appearance and corrosion resistance are both priorities. The Type 316 stainless steel composition makes them particularly appropriate for trim work in coastal homes or high-humidity spaces such as bathrooms and covered outdoor areas.

Note: Product dimensions may differ from picture. Please see the item description above for specifications.