Simpson Premium Siding Nail - 4d, 1-1/2" Length, 7/32" Full Round Head, 316 Stainless Steel, 14 Gauge, Annular-Ring Shank by Simpson Strong-Tie is engineered for long-lasting wood siding fastening in demanding outdoor and coastal environments. Passivated Type 316 stainless steel construction provides exceptional resistance to corrosion, making these siding nails the dependable choice for seaside applications and severely corrosive exposure conditions where standard fasteners would fail. The annular-ring shank locks into wood fibers for superior holding power, while the full round circle head sits flush and accepts surface finishes with minimal glare - a complete fastening solution for exterior siding work that needs to last.

Key Features

• Passivated Type 316 Stainless Steel material - resists corrosion in saltwater, coastal, and severely corrosive environments where lower-grade stainless or galvanized nails would deteriorate prematurely
• 14-gauge wire diameter with 0.083" shank - provides structural strength and consistent drive performance through wood siding without bending
• Annular-ring shank - increases withdrawal resistance and provides greater holding power compared to smooth-shank fasteners, keeping siding panels secure over time
• Full round circle head, 7/32" diameter - reduces surface glare and accepts paint or other surface finishes so the nail head blends with finished siding
• Diamond point tip - drives true and reduces board splitting during installation, especially important for thinner or more brittle siding materials
• 4d penny size, 1-1/2" length - sized specifically for wood siding fastening applications, penetrating the siding and into the substrate for a secure, lasting hold
• Made in the United States - manufactured domestically to Simpson Strong-Tie quality standards

Why This Product

• Built for the harshest outdoor conditions: Passivated Type 316 stainless steel goes beyond standard stainless in corrosion resistance, making these nails the right call for beachfront homes, docks, marine-adjacent structures, or any siding project in a severely corrosive environment.
• Holds siding in place for the long term: The annular-ring shank mechanically locks into wood fibers, delivering far greater withdrawal resistance than smooth-shank alternatives - meaning siding panels stay tight through temperature cycles, wind loads, and seasonal movement.
• Clean, finish-ready installation: The circle-pattern full round head reduces glare and accepts surface coatings, so painted or stained siding looks professional with no unsightly shiny nail heads showing through the finish.
• Drives straight, protects the board: The diamond point tip is designed to drive true and minimize board splitting - reducing waste and rework during installation on wood siding projects.

Specifications

• Brand: Simpson Strong-Tie
• Penny Size: 4d
• Length: 1-1/2 in.
• Gauge: 14
• Shank Diameter: 0.083 in.
• Shank Type: Annular-Ring Shank
• Head Diameter: 7/32 in.
• Head Type: Full Round Head
• Head Pattern: Circle Head
• Point Type: Diamond Point
• Finish: Type 316 Stainless Steel
• Material: Type 316 Stainless Steel
• Approx. Count Per Lb: 394
• Country of Origin: United States

Available Pack Options

• T4KR71: 1 Lb (394)
• T4KR75: 5 Lb (1970)
• T4KR7B: 25 Lb (9850)

Approved Applications

• Fastening Wood Siding

Frequently Asked Questions

Why should I use Type 316 stainless steel nails instead of standard stainless for siding?

Type 316 stainless steel contains molybdenum, which significantly improves resistance to chlorides and corrosive elements compared to standard 304-grade stainless. These nails are passivated - a surface treatment that further enhances corrosion resistance - making them specifically suited for seaside applications and other severely corrosive environments where standard fasteners would corrode and stain or damage the siding over time.

What makes an annular-ring shank better than a smooth shank for siding nails?

The annular-ring shank features rings along the shank that mechanically interlock with wood fibers as the nail is driven. This significantly increases withdrawal resistance - meaning the nail resists being pulled back out - compared to a smooth-shank nail of the same size. For exterior siding exposed to wind pressure and seasonal wood movement, that added holding power helps keep panels firmly in place over the long term.

Will the circle head pattern affect how the nail looks after painting siding?

The circle head pattern is designed to reduce glare and accept surface finishes such as paint or stain. Once a surface finish is applied over the siding, the full round circle head blends in rather than reflecting light, contributing to a cleaner, more finished appearance on exterior siding projects.

Is the diamond point tip important for wood siding installation?

Yes - the diamond point tip is engineered to drive straight and true while reducing the risk of splitting the board as the nail enters the wood. This is especially valuable when fastening wood siding, where board splitting can compromise the integrity of the panel and require replacement. Using a diamond point nail helps protect the material and maintain a cleaner installation.

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