Simpson 1-1/2" 4d Finishing Nail in 316 Stainless Steel is a premium brad-head finishing nail designed for applications where corrosion resistance is essential. Crafted from Type 316 stainless steel - the grade preferred for coastal and seaside environments - this 14-gauge nail drives cleanly and conceals easily, making it a trusted choice for fine finish carpentry, trim work, and exterior millwork exposed to moisture, salt air, and harsh weather conditions.

Key Features

• Type 316 stainless steel construction - delivers superior corrosion resistance in saltwater, chemical-rich, and high-humidity environments, outlasting standard galvanized or Type 304 fasteners in demanding outdoor and coastal applications
• Brad head design - the head is only slightly larger than the shank, allowing it to be countersunk below the work surface and concealed with filler for a clean, near-invisible finish
• Smooth shank profile - drives with consistent, low-resistance penetration for fast, controlled installation in trim and finish work
• Diamond point tip - self-starting point geometry reduces splitting and makes it easier to drive nails accurately into hardwoods and softwoods alike
• 14-gauge wire diameter (0.083" shank) - provides adequate holding strength for finish and trim applications without leaving oversized holes that are difficult to conceal
• 1-1/2" length (4d penny size) - sized for attaching trim, molding, and thin stock where a shorter, less visible fastener is required
• Made in the United States - domestic manufacturing supports consistent quality standards and material traceability

Why This Product

• The right choice for coastal and waterfront projects - Type 316 stainless steel is specifically recommended for seaside applications where salt spray and humidity accelerate corrosion in ordinary steel or zinc-coated nails, helping fasteners last as long as the materials they hold
• Engineered for a clean, professional finish - the brad head and smooth shank allow this nail to be countersunk and concealed with minimal effort, reducing visible fastener marks on trim, casing, and decorative woodwork
• Precision sizing for trim and finish carpentry - at 1-1/2" length and 14 gauge, this nail is proportioned specifically for attaching lighter trim and molding without cracking or over-penetrating thin stock
• Long-term durability in corrosive conditions - choosing 316 stainless steel over standard fasteners is a premium upgrade that ensures the fastener will not rust, stain, or fail prematurely in wet or chemically active environments

Specifications

• Brand: Simpson Strong-Tie
• Coating/Material: Type 316 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
• Head Type: Brad Head
• Head Pattern: Smooth
• Point Type: Diamond Point
• Approx. Count per Lb.: 434
• Country of Origin: United States

Available Pack Options

• T4FN1: 1 Lb (434)
• T4FN5: 5 Lb (2170)
• T4FNB: 25 Lb (10850)

Frequently Asked Questions

What makes Type 316 stainless steel better than Type 304 for outdoor use?

Type 316 stainless steel contains molybdenum, which significantly improves resistance to chloride corrosion - the kind caused by salt air and seawater. This makes 316 the preferred grade for seaside, coastal, and marine-adjacent applications where Type 304 fasteners may still show surface rust or staining over time.

Can this finishing nail be countersunk and concealed?

Yes. The brad head is only slightly larger than the 0.083" shank diameter, so the nail can be driven below the work surface with a nail set and then filled over with wood putty or caulk. This is a standard technique in finish carpentry that results in a smooth, fastener-free appearance on trim and molding.

What types of projects are these 1-1/2" finishing nails best suited for?

At 1-1/2" in length with a smooth shank and diamond point, these nails are sized for attaching trim boards, door and window casing, baseboard molding, and other thin stock where a discreet fastener and clean finish are priorities. Their corrosion-resistant 316 stainless steel construction also makes them well suited for exterior trim, covered porches, and any finish work in humid or coastal environments.

Does the smooth shank affect holding power compared to a ring-shank nail?

Smooth shank nails drive with less resistance and are easier to countersink cleanly, which is why they are the standard choice for finish and trim applications. Ring-shank nails offer greater withdrawal resistance but can be harder to conceal. For trim work where appearance and ease of installation are the priority, the smooth shank profile on this nail is the appropriate selection.

Note: Product dimensions may differ from picture.