Simpson #8 x 1-5/8" Bugle-Head Wood Screw with T-20 6-Lobe Drive in Type 305 Stainless Steel is engineered by Simpson Strong-Tie for fastening all types of wood decking - including cedar, redwood, and preservative-treated lumber - where long-term corrosion resistance is essential. The Type 305 stainless steel construction delivers superior protection against rust and oxidation in outdoor, coastal, and chemically treated wood environments, while the precision bugle head and aggressive Type-17 point combine to create clean, professional-looking flush installations every time.

Key Features

• Type 305 Stainless Steel material - provides superior corrosion resistance, making these screws a reliable choice for cedar, redwood, and preservative-treated wood decking exposed to moisture and the elements.
• T-20 6-Lobe drive recess - delivers a secure bit engagement that reduces cam-out during driving, extending bit life and giving installers better control on every fastener.
• Bugle-head design engineered for flush countersinking - seats cleanly at the surface without tearing or mushrooming the wood fiber, resulting in a concealed, professional finish on decking boards.
• Type-17 point - cuts into wood fibers quickly for fast, self-starting penetration without pre-drilling the main field, reducing labor time on large decking projects.
• Coarse thread pattern - draws decking boards tightly down to the framing for a secure, gap-free connection that resists loosening under foot traffic and seasonal wood movement.
• #8 screw size, 1-5/8" length - sized appropriately for standard decking board thickness, providing adequate embedment depth into the framing below while minimizing through-penetration risk.
• Approximately 150 screws per pound - a consistent count-per-weight ratio that helps professionals estimate quantities and manage job-site inventory with confidence.

Why This Product

• Engineered for corrosive environments: Type 305 stainless steel construction stands up to the moisture, tannins, and chemicals found in cedar, redwood, and preservative-treated wood - materials that rapidly corrode standard zinc-plated fasteners.
• Reduces installer frustration and rework: The 6-lobe drive geometry minimizes cam-out and bit slippage, which means fewer stripped heads, less damage to decking surfaces, and longer usable bit life on the job.
• Professional finish every time: The bugle-head geometry is specifically designed to countersink flush without tearing or cracking the wood surface, producing a clean, polished look that conceals fasteners naturally in any decking application.
• Trusted Simpson Strong-Tie quality: Manufactured to consistent tolerances with a Type-17 self-starting point and coarse threads, these screws are built for demanding outdoor decking applications where fastener reliability directly affects long-term structural performance.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #8
• Length: 1-5/8 in.
• Head Type: Bugle Head
• Head Diameter: 0.340 in.
• Drive Type: T20 6-Lobe
• Thread Type: Coarse Threads
• Point Type: Type-17 Point
• Material/Finish: Type 305 Stainless Steel
• Approx. Count Per Lb: 150
• Country of Origin: Taiwan

Available Pack Options

• S08162DT1: 1 Lb (150) - includes (1) T20 6-lobe driver bit
• S08162DT5: 5 Lb (750) - includes (1) T20 6-lobe driver bit
• S08162DTB: 4000 Pk - includes (2) T20 6-lobe driver bits

Frequently Asked Questions

What types of wood can these screws be used with?

These screws are designed to fasten all types of wood decking, including cedar, redwood, and preservative-treated woods (non-hardwood). The Type 305 stainless steel resists the corrosive chemicals and tannins found in these materials, making them a dependable choice for outdoor deck construction.

What is a Type-17 point and why does it matter?

The Type-17 point features a sharp, cutting tip that slices through wood fibers quickly, allowing the screw to start and drive without wandering or requiring pre-drilling in the main field. This speeds up installation and reduces labor on large decking projects. Note that predrilling is still recommended near board ends to prevent splitting.

What driver bit does the T-20 6-Lobe drive require?

The T-20 6-Lobe drive recess requires a T20 6-lobe (Torx-style) driver bit. This drive style provides a secure bit-to-screw engagement that significantly reduces cam-out compared to Phillips or square drives, leading to cleaner driving and longer bit life.

Why choose Type 305 stainless steel over galvanized or coated screws for decking?

Type 305 stainless steel offers superior corrosion resistance compared to standard zinc or galvanized coatings, particularly in applications involving cedar, redwood, and preservative-treated lumber - all of which contain compounds that can break down lesser coatings over time. Stainless steel fasteners maintain their integrity in outdoor and high-moisture environments, helping the deck structure remain secure over its full service life.

Note: Product dimensions may differ from picture.