The Simpson 5" x 40d Smooth Shank Common Nail in Type 316 Stainless Steel (Model T40CNB) is a heavy-duty, 6-gauge fastener engineered for demanding wood construction and decking applications. Measuring 5 inches in length with a full round head and diamond point, this nail delivers reliable holding power in a corrosion-resistant 316 stainless steel composition - making it an ideal choice for coastal and marine-adjacent environments where superior rust resistance is essential. Manufactured in the United States, this common nail represents a professional-grade solution for contractors and builders who require consistent, durable performance in every fastener.

Key Features

• Type 316 Stainless Steel Construction: Offers superior corrosion resistance compared to standard stainless steel, especially recommended for seaside and high-moisture applications where long-term durability is critical.
• Smooth Shank Design: Provides clean, consistent nail driving across a wide variety of general wood construction and decking applications.
• Full Round Head: Delivers maximum bearing surface and pull-through resistance for secure, stable connections in structural assemblies.
• Diamond Point Tip: Facilitates precise, controlled nail placement, reducing wood splitting even in dense lumber.
• Heavy 6-Gauge Wire: Ensures exceptional shear strength and structural integrity in load-bearing connections.
• 40d Penny Size / 5" Length: A large-format common nail sized for heavy framing, ledger boards, and thick dimensional lumber connections.
• Made in the United States: Domestically manufactured to consistent quality standards.

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

Frequently Asked Questions

Why is Type 316 stainless steel recommended over standard stainless steel for this nail?

Type 316 stainless steel offers superior corrosion resistance compared to standard stainless steel grades, making it especially well-suited for seaside, coastal, and high-moisture environments where long-term durability and rust resistance are critical requirements.

What applications is this nail designed for?

This nail is engineered for demanding wood construction and decking applications, including heavy framing and ledger boards. Its 5-inch length and heavy 6-gauge wire make it well-suited for load-bearing connections in thick dimensional lumber.

Will the smooth shank design affect holding power or cause splitting in dense lumber?

The smooth shank provides clean, consistent nail driving across a wide variety of general wood construction and decking applications. The diamond point tip facilitates precise, controlled nail placement that helps reduce wood splitting even in dense lumber, while the full round head delivers maximum bearing surface and pull-through resistance for secure connections.

Where is the Simpson T40CNB manufactured?

The Simpson T40CNB is manufactured in the United States.