Simpson 5 in. x 40d Smooth Shank Common Nail in Type 316 Stainless Steel is a heavy-duty, 6-gauge fastener built for serious wood construction, framing, and decking work where corrosion resistance cannot be compromised. With a 5-inch length and substantial wire diameter, this common nail is engineered to drive deep into thick dimensional lumber and hold strong - making it a go-to choice for coastal builds, high-moisture environments, and any structural connection that demands long-term durability from the fastener up.

Key Features

• Type 316 Stainless Steel Construction - delivers superior corrosion resistance compared to standard stainless steel grades, keeping fasteners structurally sound in seaside, coastal, and high-moisture conditions where lesser materials would fail prematurely.
• 6-Gauge Wire Diameter - provides the shank strength needed for load-bearing connections in heavy dimensional lumber, reducing the risk of fastener bending or failure under demanding structural loads.
• 5 In. Length with 40d Penny Size - gives contractors the penetration depth required for thick framing members, ledger boards, and heavy wood-to-wood connections where shorter nails would not provide adequate holding power.
• Smooth Shank Design - allows consistent, predictable driving behavior, making this nail well-suited for applications where clean installation and flush seating matter.
• Full Round Head with Diamond Point - the full round head maximizes bearing surface for a secure, stable seat against the wood, while the diamond point promotes accurate driving and reduces splitting in dense lumber.
• Domestic Origin - produced in the United States, supporting consistent quality standards that professional builders and contractors can rely on across projects.

Why This Product

• Purpose-Built for Coastal and High-Moisture Environments - Type 316 stainless steel is specifically recognized for its enhanced environmental durability, making this nail the right call for seaside construction, exposed decking, and any application where standard fasteners would corrode and compromise the structure over time.
• Heavy-Gauge Strength for Structural Applications - at 6 gauge with a 5-inch length, this is not a general-purpose fastener - it is sized and specified for general wood construction, heavy framing, and dimensional lumber connections where holding power directly affects structural integrity.
• A Simpson Fastener Designed for Demanding Work - Simpson is a recognized name in structural connectors and fasteners, and this nail reflects that focus on performance in applications where fastener reliability is not optional.
• Approved for a Wide Range of Professional Applications - from decking installations to heavy framing and connections requiring Type 316 stainless steel, this nail covers a broad set of demanding use cases without requiring a specialty or hard-to-source fastener.

Specifications

• Model Number: T40CNB
• Material / Coating: Type 316 Stainless Steel
• Gauge: 6
• Penny Size: 40d
• Length: 5 in.
• Head Diameter: 7/16 in.
• Shank Diameter: 0.203 in.
• Shank Type: Smooth Shank
• Head Type: Full Round Head
• Head Pattern: Smooth Head
• Point Type: Diamond Point
• Country of Origin: United States

Approved Applications

• General wood construction and framing
• Decking installations
• Coastal and seaside construction where corrosion resistance is required
• Heavy dimensional lumber connections
• Applications requiring Type 316 stainless steel fasteners for enhanced environmental durability

What's Included

• Simpson Model T40CNB - 5" x 40d Smooth Shank Common Nails, Type 316 Stainless Steel, 6 Gauge

Note: Product dimensions may differ from picture. Please refer to the specifications listed