Simpson 4-inch 20d Smooth Shank Common Nail in 304 Stainless Steel is a heavy-duty fastener built for decking, framing, and general wood construction where long-term corrosion resistance matters. Crafted from Type 304 stainless steel in a 6-gauge profile, this full round head nail with a diamond point and smooth shank drives cleanly into a wide range of lumber types - delivering reliable holding power in outdoor structures, wood foundations, and exposed environments.

Key Features

• Type 304 stainless steel construction - resists rust, oxidation, and corrosion in outdoor and high-moisture applications, extending the service life of your structure without staining the surrounding wood
• Smooth shank profile - drives consistently and cleanly through lumber for efficient installation across decking, framing, and general wood construction tasks
• Full round head with smooth head pattern - provides broad bearing surface for secure, flush-seating connections that distribute load evenly across the fastened material
• Diamond point tip - penetrates wood fiber cleanly and reduces splitting risk, making it well-suited for seasoned and engineered lumber applications
• 6-gauge, 4-inch (20d) length - offers the structural depth needed for connecting thicker lumber members in heavy wood construction and permanent installations
• Made in the United States - consistent manufacturing standards support reliable, predictable performance on every job site

Why This Product

• Ideal for outdoor and exposed wood construction - Type 304 stainless steel holds up against moisture and environmental exposure that would cause standard carbon steel nails to corrode prematurely, protecting the integrity of your build over time
• Recommended for permanent wood foundations - stainless steel nails align with ANSI/AWC Permanent Wood Foundations Design Specifications, making this nail a code-conscious choice for permanent structural applications
• A trusted Simpson Strong-Tie fastener - Simpson is a recognized name in structural fasteners and connectors, and this nail is designed to pair with Simpson's broader range of framing and decking hardware
• Versatile across common construction scenarios - the smooth shank, full round head, and 20d penny size make this nail a practical, general-purpose choice for decking boards, framing members, and wood assemblies where a clean, strong mechanical connection is required

Specifications

• Brand: Simpson Strong-Tie
• Material/Coating: Type 304 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 Head
• Point Type: Diamond Point
• Approx. Count per Lb.: 25
• Country of Origin: United States

Available Pack Options

• S20CN1: 1 Lb (25)
• S20CN5: 5 Lb (125)
• S20CNB: 25 Lb (625)

Frequently Asked Questions

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

Type 304 stainless steel provides solid corrosion resistance for most outdoor and general construction applications, including permanent wood foundations. Type 316 stainless steel offers superior corrosion resistance and is specifically recommended for seaside or coastal environments where saltwater exposure is a concern. If your project is near the ocean or in a highly corrosive environment, Type 316 may be the better choice.

Is this nail appropriate for use in permanent wood foundations?

Yes. Stainless steel nails are recommended for the construction of permanent wood foundations in accordance with the ANSI/AWC Permanent Wood Foundations Design Specifications. This Type 304 stainless steel nail meets that material requirement for most non-coastal permanent foundation applications.

What does the smooth shank design mean for installation?

A smooth shank drives more easily than a ring or screw shank nail, allowing for faster installation in decking and framing applications. While smooth shank nails offer somewhat less withdrawal resistance than ring shank nails, they are well-suited for general wood construction where ease of driving and clean entry are priorities.

What lumber types is this nail compatible with?

This stainless steel common nail is suitable for a variety of wood construction applications including decking and general framing. Stainless steel is particularly important when fastening pressure-treated lumber, since the chemicals used in treated wood can cause accelerated corrosion in standard carbon steel or hot-dipped galvanized fasteners over time.

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