Simpson Premium 4d Siding Nail in 14-gauge, passivated Type 316 Stainless Steel is engineered for fastening wood siding in demanding outdoor environments where ordinary nails fall short. Featuring a 1-1/2" length, a 5/32" full round head, and an annular-ring shank, this corrosion-resistant fastener delivers exceptional holding power and long-term durability - making it a trusted choice for coastal construction, seaside applications, and any severely corrosive environment where superior weather resistance is non-negotiable.

Key Features

• Passivated Type 316 Stainless Steel material - resists corrosion in salt air, moisture, and chemically aggressive outdoor environments, making it ideal for seaside and severe-exposure siding projects
• Annular-ring shank design - increases withdrawal resistance and provides significantly greater holding power than smooth-shank alternatives, keeping siding panels secure over time
• Full round circle head at 5/32" diameter - reduces glare on finished siding surfaces and accepts paint or other surface finishes, maintaining a clean, professional appearance
• Diamond point tip - drives straight and true while reducing the risk of board splitting, speeding up installation and protecting wood siding from damage
• 14-gauge wire at 0.083" shank diameter - provides a strong, consistent fastener body suited for the structural demands of wood siding attachment
• 4d penny size at 1-1/2" length - sized specifically for wood siding applications, ensuring proper penetration depth without over-driving
• Made in the United States - manufactured to consistent quality standards for reliable, project-ready performance

Why This Product

• Built for the harshest coastal conditions - passivated Type 316 stainless steel is specifically suited for seaside and severely corrosive environments where standard galvanized or lower-grade stainless fasteners would degrade prematurely, protecting your siding investment for the long term
• Holds tighter, longer - the annular-ring shank grips wood fibers more aggressively than smooth or screw-shank nails, reducing the risk of siding loosening or backing out under thermal expansion, wind loads, or moisture cycling
• Protects the wood during installation - the blunt diamond point reduces board splitting as the nail is driven, which is especially important when working with pre-finished or narrow-profile siding materials
• Finish-ready head for professional results - the circle pattern on the full round head accepts surface finishes and minimizes visible glare, helping exterior siding maintain its intended appearance after installation

Specifications

• Brand: Simpson Strong-Tie
• Penny Size: 4d
• Length: 1-1/2 in.
• Gauge: 14
• Shank Diameter: 0.083 in.
• Head Diameter: 5/32 in.
• Head Type: Full Round Head
• Head Pattern: Circle Head
• Shank Type: Annular-Ring Shank
• Point Type: Diamond Point
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Approx. Count Per Lb: 398
• Country of Origin: United States

Available Pack Options

• T4KR51: 1 Lb (398)
• T4KR55: 5 Lb (1990)
• T4KR5B: 25 Lb (9950)

Approved Applications

• Fastening Wood Siding

Frequently Asked Questions

Why is Type 316 stainless steel preferred over Type 304 for siding in coastal areas?

Type 316 stainless steel contains additional molybdenum, which significantly improves its resistance to chloride corrosion - the type of corrosion caused by salt air and saltwater exposure. This makes it the appropriate choice for seaside siding applications and other severely corrosive outdoor environments where long-term fastener integrity is critical.

What does "passivated" mean, and why does it matter for these nails?

Passivation is a chemical treatment applied to stainless steel that removes surface contaminants and strengthens the natural oxide layer, enhancing the metal's corrosion resistance. For siding nails exposed to moisture, salt air, and outdoor weathering, passivated Type 316 stainless steel ensures the fastener maintains its integrity and appearance over time without rust staining or degradation.

How does the annular-ring shank improve performance compared to a smooth-shank nail?

The annular-ring shank features rings along the shank that lock into wood fibers as the nail is driven, dramatically increasing withdrawal resistance compared to a smooth shank. This means the nail is far less likely to back out or loosen over time due to wood movement, humidity changes, or wind loads - resulting in a more secure and lasting siding installation.

Will the diamond point cause splitting in wood siding boards?

The blunt diamond point on these nails is specifically designed to reduce board splitting as it drives into wood. By displacing rather than wedging wood fibers, the diamond point helps protect siding boards from cracking during installation, which is especially important with narrower or pre-finished siding profiles.

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