Simpson 4 in. 20d Smooth Shank Common Nail in Type 316 Stainless Steel is a professional-grade, 6-gauge fastener built for heavy-duty wood construction where long-term holding strength and corrosion resistance are non-negotiable. Designed for general framing, decking, and coastal jobsites, this full round head common nail delivers dependable performance in the conditions that put ordinary fasteners to the test. Domestic craftsmanship backs every nail in this line, giving contractors and builders a reliable option for structurally demanding and environmentally challenging applications alike.

Key Features

• Type 316 Stainless Steel Construction - provides a higher level of corrosion resistance than standard stainless steel grades, keeping fasteners structurally sound in moisture-rich and salt-air environments over the long term.
• 6-Gauge Shank at 0.203 in. Diameter - delivers heavy-duty holding power suited to structural framing and load-bearing wood construction tasks.
• Smooth Shank Profile - allows for clean, controlled driving during installation, making it a practical choice for decking work and general carpentry where consistent placement matters.
• Full Round Head with Smooth Head Pattern - provides a wide bearing surface for secure seating against the workpiece, reducing the risk of pull-through in framing and decking assemblies.
• Diamond Point Tip - facilitates accurate starting and penetration into wood, helping reduce splitting and improving efficiency on the job.
• 4 in. Length / 20d Penny Size - sized for common framing and decking fastening tasks where deeper penetration and stronger withdrawal resistance are required.
• Compatibility with Treated Lumber - Type 316 stainless steel composition makes this nail a sound choice for use with pressure-treated wood, where material compatibility is an important consideration.

Why This Product

• Built for coastal and high-moisture environments - Type 316 stainless steel offers a meaningful step up in corrosion resistance over standard stainless grades, making this nail a practical long-term investment for seaside construction and outdoor projects exposed to persistent moisture.
• Trusted Simpson quality with domestic production - engineered and produced in the United States, this nail reflects the standards builders associate with the Simpson brand for structural fastening reliability.
• Versatile across key applications - approved for general wood construction, framing, decking installation and repair, and use with treated lumber, this single fastener covers a broad range of common jobsite needs without compromise.
• Heavy-gauge holding strength where it counts - the 6-gauge, 4 in. shank delivers the withdrawal resistance and structural holding power that framing and decking applications demand, backed by a full round head designed to seat firmly and stay put.

Specifications

• Model Number: T20CN1
• Brand: Simpson Strong-Tie
• Material / Coating: Type 316 Stainless Steel
• Gauge: 6
• Penny Size: 20d
• Length: 4 in.
• Head Diameter: 7/16 in.
• Shank Diameter: 0.203 in.
• Shank Type: Smooth Shank
• Head Type: Full Round Head
• Head Pattern: Smooth
• Point Type: Diamond Point
• Country of Origin: United States

Approved Applications

• General wood construction and framing
• Decking installation and repair
• Coastal and seaside construction projects where elevated corrosion resistance is required
• Applications involving treated lumber where enhanced material compatibility is important

Note: Product dimensions may differ from picture. Please refer to the specifications listed above for accurate measurements.