Simpson 7d Premium Siding Nail in 316 Stainless Steel is engineered for demanding exterior applications where standard fasteners fail. Built from passivated Type 316 stainless steel in a 13-gauge profile, this 2-1/4" nail delivers exceptional corrosion resistance in coastal, seaside, and severe-exposure environments. The annular ring shank provides strong holding power through wood movement, while the circle-pattern full round head sits cleanly against siding surfaces - making this nail a trusted choice for professional siding installation in harsh outdoor conditions.

Key Features

• Type 316 stainless steel construction - withstands saltwater exposure, chemical contact, and severely corrosive environments, including seaside and waterfront applications where standard nails corrode prematurely
• Passivated finish - the passivation process enhances the natural corrosion resistance of the stainless steel, extending service life and reducing maintenance concerns in wet or coastal climates
• Annular ring shank design - increases withdrawal resistance and provides greater holding power compared to smooth-shank nails, keeping siding panels firmly in place through seasonal wood expansion and contraction
• Circle pattern full round head - reduces surface glare and readily accepts paint and other surface finishes, helping siding maintain a clean, professional appearance after installation
• Blunt diamond point tip - drives straight and true while minimizing board splitting, reducing waste and rework during siding installation
• 13-gauge wire diameter (0.092" shank) - provides the structural rigidity needed for reliable siding fastening without requiring pre-drilling in most applications
• 7d penny size at 2-1/4" length - a standard siding nail length sized for penetrating through siding and into sheathing or framing with appropriate embedment depth

Why This Product

• Purpose-built for severe coastal exposure - Type 316 stainless steel is recognized for its performance in saltwater and chemically aggressive environments, making this nail the appropriate fastener choice when standard galvanized or lower-grade stainless nails would corrode and stain siding surfaces.
• Holds siding through long-term weather cycles - the annular ring shank resists withdrawal forces caused by wind loads and wood movement, reducing the risk of loose or popped siding over time without requiring re-nailing or repairs.
• Finish-friendly head design - the circle pattern head reduces glare and accepts surface coatings, so nails blend into painted or stained siding without creating reflective hot spots or requiring additional concealment steps.
• American-made quality - produced in the United States and backed by Simpson's reputation for premium structural fasteners, providing confidence in consistent material quality and dimensional accuracy across every nail.

Specifications

• Brand: Simpson Strong-Tie
• Penny Size: 7d
• Length: 2-1/4 in.
• Head Diameter: 2/9 in.
• Shank Diameter: 0.092 in.
• Gauge: 13
• Shank Type: Annular-Ring Shank
• Head Type: Full Round Head
• Head Pattern: Circle
• Point Type: Diamond Point
• Coating/Material: Type 316 Stainless Steel
• Approx. Count per Lb.: 216
• Country of Origin: United States

Available Pack Options

• T7KR71: 1 Lb (216)
• T7KR75: 5 Lb (1080)
• T7KR7B: 25 Lb (5400)

Frequently Asked Questions

Why is Type 316 stainless steel recommended for siding nails in coastal areas?

Type 316 stainless steel contains molybdenum, which significantly improves resistance to saltwater, chlorides, and other corrosive agents compared to standard 304 stainless steel. For seaside and severe-exposure siding applications, this grade of stainless steel helps prevent the nail from corroding and staining the siding surface over time. These nails are also passivated, further enhancing their corrosion resistance.

What is the benefit of an annular ring shank over a smooth shank on a siding nail?

The annular ring shank features circular ridges along the shank that grip the surrounding wood fibers, increasing withdrawal resistance compared to a smooth-shank nail. This greater holding power helps keep siding panels secure through seasonal wood movement, temperature fluctuations, and wind loads - reducing the likelihood of nails loosening or siding panels pulling away from the structure.

What does the circle head pattern on this siding nail do?

The circle pattern on the full round head serves two practical purposes: it reduces surface glare so the nail head is less visually prominent on light-colored or painted siding, and it creates a texture that accepts paint, stain, and other surface finishes more readily than a smooth head - helping the installed fastener blend into the finished siding appearance.

How does the blunt diamond point help during siding installation?

The blunt diamond point is designed to drive straight and true, reducing the tendency of the nail to deflect off-course during installation. More importantly, the blunt tip reduces the likelihood of splitting boards along the wood grain - which is especially valuable when nailing near the edges of siding planks where splitting is most common. This helps protect the siding material and reduces waste on the job site.

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