Simpson 8d 0.120" x 2-1/2" Preservative-Treated Wood Decking Nail in Type 316 Stainless Steel by Simpson Strong-Tie is a purpose-built exterior fastener engineered for deck and dock construction using preservative-treated pine. The annular-ring shank design bites deep into wood fibers to resist withdrawal forces over time, helping keep deck boards flat and nail heads flush - even through years of seasonal expansion and contraction. Type 316 stainless steel construction delivers exceptional corrosion resistance in wet, saltwater, and chemically active outdoor environments, making this nail a dependable choice for seaside decks, docks, and other harsh-exposure applications.

Key Features

• Type 316 Stainless Steel material - offers superior corrosion resistance compared to standard stainless grades, making it well-suited for coastal, saltwater, and chemically treated wood environments where lesser fasteners would corrode and stain
• Annular-ring shank - the ring-grooved shank locks into wood fibers to increase withdrawal resistance, reducing nail-pop and helping deck boards stay securely fastened over the long term
• Larger shank diameter (0.120") - allows the nail to penetrate both green and seasoned preservative-treated pine without splitting boards, simplifying installation across a range of lumber moisture levels
• Checkered full round head (9/32" diameter) - the textured surface blends naturally with wood grain and diffuses light to reduce glare, while the full round head provides a broad bearing surface that holds boards firmly without countersinking
• Diamond point tip - the tapered point displaces wood fibers cleanly for easier driving, reducing effort and the risk of splitting during installation
• 11-gauge wire, 8d penny size at 2-1/2" length - matches standard decking nail sizing requirements, providing correct embedment depth for typical deck board thicknesses
• Made in the United States - domestic manufacturing supports consistent quality control and reliable dimensional accuracy

Why This Product

• Designed specifically for preservative-treated wood decks and docks - the larger shank diameter and annular-ring profile are optimized for the denser, more fibrous character of pressure-treated pine, reducing installation difficulty while maximizing holding power
• Type 316 stainless steel is the recommended choice for applications near saltwater or in direct contact with modern preservative-treated lumber chemicals that can accelerate corrosion in lower-grade metals - this nail stands up where standard galvanized fasteners may fail prematurely
• The annular-ring shank directly addresses one of the most common deck maintenance issues - nail heads gradually popping above the board surface - by locking the fastener in place and maintaining withdrawal resistance over the life of the structure
• The checkered head pattern reduces sunlight glare on the nail heads after installation, delivering a cleaner finished appearance on exposed decking surfaces without additional finishing steps

Specifications

• Brand: Simpson Strong-Tie
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Penny Size: 8d
• Gauge: 11
• Length (in.): 2-1/2
• Shank Diameter (in.): 0.120
• Head Diameter (in.): 9/32
• Head Type: Full Round Head
• Head Pattern: Checkered
• Shank Type: Annular-Ring Shank
• Point Type: Diamond Point
• Approx. Count Per Lb.: 115
• Country of Origin: United States

Available Pack Options

• T8PTD1: 1 Lb (115)
• T8PTD5: 5 Lb (575)
• T8PTDB: 25 Lb (2875)

Frequently Asked Questions

Why should I use Type 316 stainless steel nails instead of Type 304 or galvanized for my deck project?

Type 316 stainless steel contains molybdenum, which provides greater resistance to chlorides and the chemicals found in modern preservative-treated lumber than Type 304 or standard galvanized steel. For applications near saltwater or where ACQ- or CA-treated wood is used, Type 316 is the preferred choice to prevent premature corrosion, staining, and fastener failure.

What does "annular-ring shank" mean and why does it matter for decking?

An annular-ring shank features a series of rings or ridges along the nail's shaft. These rings grip wood fibers as the nail is driven, dramatically increasing resistance to withdrawal forces - the forces that try to pull the nail back out. In decking applications, this means nail heads are far less likely to pop above the board surface over time due to moisture cycling and seasonal wood movement.

Is this nail compatible with both green (wet) and kiln-dried preservative-treated pine?

Yes. The 0.120" shank diameter on this nail is specifically sized to penetrate both green (freshly treated, higher moisture content) and seasoned (kiln-dried) preservative-treated pine. The diamond point further assists with clean penetration in either wood condition.

Can these nails be used for dock construction in addition to decking?

Yes. Simpson Strong-Tie lists deck and dock projects as the intended applications for this preservative-treated wood decking nail. The Type 316 stainless steel material is well suited for dock environments where fasteners are regularly exposed to water, humidity, and salt air.

Note: Product dimensions may differ from picture.