Simpson #10 x 2-1/2" Bugle-Head Wood Deck Screw with #2 Square Drive in Type 316 Stainless Steel is a heavy-duty exterior fastener engineered by Simpson Strong-Tie for reliable, corrosion-resistant wood-to-wood fastening in demanding outdoor environments. Designed specifically for wood decking applications - including cedar, redwood, and preservative-treated lumber - these screws deliver the holding power and long-term durability needed to keep your deck boards tight, flush, and firmly anchored season after season. The Type 316 stainless steel construction makes them a go-to choice for coastal, high-moisture, and chemically aggressive settings where standard fasteners fall short.

Key Features

• Type 316 Stainless Steel material - provides superior resistance to saltwater, moisture, and chemical exposure, making these screws well-suited for seaside decking projects and wet outdoor environments where corrosion is a constant concern.
• Bugle head profile with 0.340" head diameter - countersinks flush with the decking surface without requiring pre-countersinking, resulting in a clean, snag-free finish that protects bare feet and deck furniture from raised fastener heads.
• #2 Square drive type - delivers positive bit engagement and reduces cam-out during installation, giving installers more control and a more secure drive compared to Phillips-style heads, especially when driving screws at an angle or into dense hardwoods.
• Type-17 point - self-piercing tip starts fast without pre-drilling into most wood surfaces, saving time on large decking installations and reducing the chance of the screw wandering off-center at the start.
• Coarse threads running approximately 2/3 up the shank - pull decking boards tightly down against the framing substrate for a secure, gap-minimizing connection that resists board movement and uplift over time.
• #10 screw size at 2-1/2" length - provides substantial penetration into the joist or structural member beneath the deck board, ensuring a strong mechanical connection appropriate for standard deck board thicknesses.

Why This Product

• Built for coastal and high-exposure outdoor use - Type 316 stainless steel offers a higher level of corrosion resistance than Type 304 stainless, making these screws the right choice for seaside decks, pool surrounds, and any application where saltwater or harsh chemicals accelerate fastener degradation.
• Compatible with modern decking materials - approved for use with cedar, redwood, and preservative-treated wood, these screws resist the chemical reactions that can cause lesser fasteners to corrode and stain wood in treated-lumber applications.
• Installer-ready right out of the package - a #2 square driver bit is included, so you can begin fastening immediately without hunting for the correct bit, reducing setup time on the job site.
• Flush-finish design protects your decking investment - the bugle head countersinks cleanly without a countersink bit, preserving the integrity of the wood surface and delivering a professional, consistent appearance across the entire deck field.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #10
• Length: 2-1/2 in.
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Head Type: Bugle Head
• Head Diameter: 0.340 in.
• Drive Type: #2 Square
• Thread Type: Coarse Threads
• Point Type: Type-17 Point
• Approximate Count Per Lb.: 82
• Country of Origin: Taiwan

Available Pack Options

• T10250DB1: 1 Lb - includes #2 square driver bit included (replacement bit model BIT2S-2-R2)
• T10250DB5: 5 Lb - includes #2 square driver bit included (replacement bit model BIT2S-2-R2)
• T10250DBB: 2000 Pk - includes #2 square driver bit included (replacement bit model BIT2S-2-R2)

Approved Applications

• Fastening Wood-to-Wood
• Decks - Deck Boards Wood

Frequently Asked Questions

Can these screws be used with pressure-treated wood?

Yes. Simpson Strong-Tie #10 x 2-1/2" Type 316 stainless steel deck screws are approved for use with preservative-treated woods, in addition to cedar and redwood. The Type 316 stainless steel material resists the chemical compounds found in modern pressure-treated lumber that can cause corrosion in lower-grade fasteners.

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

The Type-17 point is designed for fast starts without pre-drilling into most wood surfaces. However, pre-drilling is recommended near board ends to help prevent wood splitting, particularly with denser species or boards that are close to the edge.

What is the difference between Type 316 and Type 304 stainless steel for outdoor decking?

Type 316 stainless steel contains an additional molybdenum content that provides enhanced resistance to saltwater, chlorides, and chemicals compared to Type 304. This makes Type 316 fasteners the preferred choice for coastal decking, poolside installations, and any environment with elevated exposure to corrosive elements.

What driver bit do I need to install these screws?

These screws use a #2 square drive. A #2 square driver bit is included with your purchase. If a replacement bit is needed, the compatible replacement bit model is BIT2S-2-R2.