Simpson Strong-Tie #10 x 2-1/2" Bugle-Head Wood Screw with T-25 6-Lobe Drive in Type 305 Stainless Steel is engineered for professional-grade fastening in outdoor decking applications where long-term corrosion resistance is critical. Built from Type 305 stainless steel, these coarse-thread screws deliver reliable performance in cedar, redwood, and preservative-treated lumber - making them a trusted choice for deck builders, contractors, and serious DIYers who need a clean, flush finish that holds up in demanding environments.

Key Features

• Type 305 Stainless Steel material - provides superior corrosion resistance in outdoor, moisture-exposed, and preservative-treated wood applications, helping fasteners maintain structural integrity over time
• Bugle-head profile with 0.340" head diameter - engineered for flush countersinking that leaves a concealed, professional finish without tearing or damaging the wood surface
• T-25 6-Lobe drive recess - delivers a secure bit engagement that reduces cam-outs during driving, extending bit life and reducing installer fatigue on large decking projects
• Type-17 cutting point - enables fast, clean starts that cut through wood fibers efficiently, reducing the need to predrill in most applications along the field of the board
• Coarse thread pattern - draws decking and structural material tightly together for a firm, gap-free connection between boards and framing
• #10 screw diameter x 2-1/2" length - sized appropriately for standard wood decking installations, providing adequate thread engagement into the framing below
• Approximately 82 screws per pound - allows accurate project quantity estimation so you can plan material needs with confidence before starting work

Why This Product

• For deck builders working with cedar, redwood, or pressure-treated lumber, the Type 305 stainless steel construction resists the corrosive effects of moisture and wood preservatives that can cause standard steel screws to fail, stain, or loosen over time.
• The bugle-head geometry countersinks flush without surface damage, delivering a clean, concealed look that elevates the finished appearance of any deck or outdoor wood structure.
• The 6-lobe T-25 drive system minimizes cam-outs compared to traditional Phillips-head screws, which means faster installation, less bit replacement, and a cleaner drive experience across an entire project.
• The Type-17 point cuts cleanly into wood for fast starts without pre-drilling along the field, saving significant time on large-scale decking jobs while reducing the risk of splitting.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #10
• Length: 2-1/2 in.
• Head Type: Bugle Head
• Head Diameter: 0.340 in.
• Drive Type: T25 6-Lobe
• Thread Type: Coarse Threads
• Point Type: Type-17 Point
• Material/Finish: Type 305 Stainless Steel
• Approx. Count Per Lb: 82
• Country of Origin: Taiwan

Available Pack Options

• S10250DT1: 1 Lb (82) - includes (1) T25 6-lobe driver bit
• S10250DT5: 5 Lb (410) - includes (1) T25 6-lobe driver bit
• S10250DTB: 2000 Pk - includes (2) T25 6-lobe driver bits

Frequently Asked Questions

What types of wood are these screws compatible with?

These screws are designed for fastening all types of wood decking, including cedar, redwood, and preservative-treated woods (non-hardwood). The Type 305 stainless steel construction resists the corrosive chemistry found in many pressure-treated lumber products.

What driver bit do I need to drive these screws?

These #10 screws use a T-25 6-lobe drive. Use a T25 6-lobe driver bit for proper engagement. The 6-lobe recess is specifically designed to reduce cam-outs and extend bit life compared to standard Phillips or square drives.

Do I need to pre-drill before installing these screws?

The Type-17 cutting point enables fast starts in most field installations without pre-drilling. However, pre-drilling is recommended near board ends to help prevent splitting, particularly in denser or more brittle wood species.

Why is a bugle-head profile used for decking applications?

The bugle-head geometry is specifically engineered for flush countersinking into wood surfaces. It distributes driving force gradually as the head seats, reducing surface tear-out and yielding a clean, concealed fastener appearance for a professional finished result.

Note: Product dimensions may differ from picture.