Simpson 1-1/4" 3d Finishing Nail in 304 Stainless Steel is a premium brad-head finishing nail engineered for trim, millwork, and finish carpentry applications where corrosion resistance and a clean, concealed appearance are essential. Crafted from Type 304 stainless steel, this 15-gauge nail delivers lasting holding power in moisture-prone and corrosive environments - making it a dependable upgrade over standard galvanized or bright-finish fasteners. The slim brad head and smooth shank allow the nail to be countersunk and filled flush, leaving virtually no visible trace on finished surfaces.

Key Features

• Type 304 stainless steel construction - resists rust, corrosion, and staining in humid, damp, and chemically active environments, extending the life of both the fastener and the surrounding material
• 15-gauge diameter (0.072" shank) - provides a strong, controlled drive with minimal splitting risk in trim lumber and finish woodwork
• 1-1/4" length (3d penny size) - sized correctly for thin finish materials, trim boards, and interior molding applications where deeper penetration could cause blowthrough
• Brad head style (0.109" head diameter) - head is only slightly wider than the shank, allowing the nail to be countersunk below the work surface and concealed with filler for a smooth, professional finish
• Smooth shank - drives cleanly and consistently, reducing surface marring during installation
• Diamond point tip - sharpened geometry guides the nail through wood fibers more easily, reducing the force needed to drive each fastener and lowering the chance of surface damage

Why This Product

• Built to outlast the materials it fastens - Type 304 stainless steel does not corrode or stain in moist or moderately corrosive conditions, meaning the fastener remains structurally sound and visually clean long after installation
• Disappears on the finished surface - the brad head profile and smooth shank make countersinking straightforward, so painters, finish carpenters, and trim installers can achieve a polished result without visible fastener heads
• Right size for finish work - at 1-1/4" and 15 gauge, this nail hits the sweet spot for attaching thin trim and molding without splitting delicate stock or punching through the back face
• Made in the United States - domestic manufacturing supports consistent quality standards and reliable dimensional accuracy for professional applications

Specifications

• Brand: Simpson Strong-Tie
• Coating/Material: Type 304 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

• S3FN1: 1 Lb (649)
• S3FN5: 5 Lb (3245)
• S3FNB: 25 Lb (16225)

Frequently Asked Questions

What is the difference between Type 304 and Type 316 stainless steel for finishing nails?

Type 304 stainless steel provides excellent corrosion resistance for most interior and outdoor applications away from direct saltwater exposure. Type 316 stainless steel offers superior resistance to chlorides and is the better choice for coastal or seaside environments where salt spray is a regular concern.

Can these nails be countersunk and hidden on a finished surface?

Yes. The brad head design features a head diameter of only 0.109 in. - just slightly wider than the 0.072 in. shank - which makes it easy to countersink below the work surface using a nail set. The small void left behind can then be filled with wood filler or putty for a smooth, seamless appearance.

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

At 1-1/4" in length and 15 gauge, these nails are well suited for attaching interior trim, moldings, thin finish boards, and light millwork where a clean look is required and deeper fasteners could risk splitting the material or penetrating through the back face.

How many nails are in a pound of these 3d finishing nails?

There are approximately 649 nails per pound for this 1-1/4" 15-gauge brad-head finishing nail, which can be a helpful reference when estimating quantities needed for a finish carpentry or trim installation project.

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