Simpson 1-1/2" 4d Finishing Nail in 304 Stainless Steel is a premium fastener designed for trim, millwork, and finish carpentry applications where corrosion resistance and a low-profile appearance are essential. Crafted from Type 304 stainless steel at 14 gauge, this smooth-shank finish nail delivers reliable holding power while resisting rust and degradation in demanding or moisture-prone environments - making it a dependable long-term solution wherever standard steel fasteners would fail over time.

Key Features

• Type 304 stainless steel construction - resists corrosion and oxidation in humid, wet, and chemically active environments, helping fasteners last as long as the materials they secure
• 14 gauge smooth shank - drives cleanly through finish materials with reduced splitting risk, providing consistent holding strength for trim and casing work
• Diamond point tip - self-starting geometry makes driving easier and more controlled, reducing the chance of deflection or surface damage
• Brad head style with 0.12" head diameter - the small, discreet head sits only slightly wider than the 0.083" shank, making it easy to countersink and conceal for a clean, finished look
• 4d penny size at 1-1/2" length - a versatile finish nail length suited for attaching thin trim, molding, and light finish assemblies without over-penetrating
• Smooth head pattern - pairs with the brad head design for minimal surface disruption and easy concealment with wood filler or putty
• Made in the United States - domestic manufacturing supports consistent quality control and material traceability

Why This Product

• Built for corrosive conditions - Type 304 stainless steel holds up where plain steel or zinc-coated nails would rust and stain, making these nails a smart choice for bathrooms, exterior trim, coastal siding, and other moisture-exposed finish work
• Virtually invisible after installation - the brad head design and small 0.12" head diameter allow the nail to be countersunk below the surface and filled flush, leaving no visible hardware mark in finished trim or millwork
• Engineered for finish carpentry - the combination of smooth shank, diamond point, and 14 gauge wire gives installers a nail that drives straight, holds firmly, and won't mar delicate finish surfaces
• A lasting upgrade over standard fasteners - stainless steel nails are rated for longevity in corrosive environments, reducing the risk of nail bleed-through staining on painted or stained trim over time

Specifications

• Brand: Simpson Strong-Tie
• Coating/Material: Type 304 Stainless Steel
• Gauge: 14
• Penny Size: 4d
• Length: 1-1/2 in.
• Head Diameter: 0.12 in.
• Shank Diameter: 0.083 in.
• Shank Type: Smooth Shank
• Head Type: Brad Head
• Head Pattern: Smooth Head
• Point Type: Diamond Point
• Approx. Count per Lb.: 434
• Country of Origin: United States

Available Pack Options

• S4FN1: 1 Lb (434)
• S4FN5: 5 Lb (2170)
• S4FNB: 25 Lb (10850)

Frequently Asked Questions

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

Type 304 stainless steel offers excellent general corrosion resistance for most interior and exterior finish applications in humid or moisture-prone environments. Type 316 stainless steel provides superior corrosion resistance and is recommended for seaside or saltwater-exposed applications where chloride exposure is a concern. If your project is near the coast or in a marine environment, Type 316 is the preferred choice.

Can these finishing nails be countersunk and concealed?

Yes. The brad head design features a small 0.12" head diameter - only slightly larger than the 0.083" shank - which allows the nail to be driven below the work surface with a nail set. Once countersunk, the small recess can be filled with wood putty or filler for a seamless, hardware-free finish on trim and molding.

What applications are these 1-1/2" stainless steel finishing nails best suited for?

These 4d finishing nails are well suited for interior and exterior finish carpentry tasks including attaching trim, casing, base molding, crown molding, and other light finish assemblies. The 304 stainless steel construction makes them particularly valuable in environments with elevated moisture or humidity where standard steel nails might rust and cause staining on finished surfaces.

How many nails are there per pound for this product?

There are approximately 434 nails per pound for this 1-1/2" 14 gauge brad head finishing nail. This count can help you estimate how many pounds you may need based on your project's fastener requirements.

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