Simpson #10 x 2-1/2" Bugle-Head Wood Deck Screw with #2 Square Drive in Type 305 Stainless Steel is a heavy-duty exterior fastener engineered for long-lasting performance in outdoor decking applications. Designed by Simpson Strong-Tie, these corrosion-resistant deck screws deliver reliable wood-to-wood fastening for cedar, redwood, and preservative-treated lumber - making them a trusted choice for contractors and DIYers building or repairing outdoor living spaces. The Type 305 stainless steel construction provides strong resistance to the moisture and oxidation that typically degrade standard fasteners in exterior environments, helping your deck maintain structural integrity over time.

Key Features

• Type 305 Stainless Steel material - resists corrosion and oxidation in exterior environments, helping the fastener hold strong through repeated wet-dry cycles without rusting or staining wood surfaces
• Bugle head design with 0.340" head diameter - countersinks flush with the decking surface automatically, creating a clean finished appearance without the need for a countersink bit
• Type-17 cutting point - self-starting tip bores into wood quickly for fast, confident starts without pre-drilling in most field applications
• Coarse thread pattern - draws decking material tight against the substrate as the screw seats, reducing gaps and improving the overall rigidity of the deck surface
• #2 Square drive - reduces bit cam-out compared to Phillips drive, giving the installer better torque control and reducing stripped heads during installation
• Compatible with preservative-treated woods - formulated to resist the accelerated corrosion that pressure-treated lumber chemicals can cause on lesser-grade fasteners
• Approximately 82 screws per pound - gives you a practical reference for estimating quantities needed based on project weight or bulk purchases

Why This Product

• Building a deck with cedar, redwood, or ACQ pressure-treated lumber requires fasteners that won't corrode and bleed rust stains onto your boards - Type 305 stainless steel addresses exactly that challenge in standard outdoor decking conditions
• The bugle head geometry eliminates a separate countersinking step, letting the screw seat flush on its own and saving installation time across hundreds of fastening points on a full deck
• The included #2 square driver bit means you can get started immediately without hunting for the right drive tool - and a replacement bit (model BIT2S-2-R2) is available separately when needed
• The Type-17 point combined with coarse threading makes this screw well-suited for the repetitive, high-volume fastening demands of deck board installation, where speed and consistent pull-down matter on every board

Specifications

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

Available Pack Options

• S10250DB1: 1 Lb - includes #2 square driver bit included (replacement bit model BIT2S-2-R2)
• S10250DB5: 5 Lb - includes #2 square driver bit included (replacement bit model BIT2S-2-R2)
• S10250DBM: 1000 Pk - includes #2 square driver bit included (replacement bit model BIT2S-2-R2)
• S10250DBB: 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 lumber?

Yes. These screws are explicitly approved for use with preservative-treated woods. The Type 305 stainless steel resists the accelerated corrosion that the chemicals in pressure-treated lumber can cause on standard steel fasteners, making them a suitable choice for treated deck framing and decking applications.

What drive bit do I need for these screws?

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

Will the bugle head sit flush without pre-drilling a countersink?

Yes. The bugle head geometry is designed to countersink itself flush with the surface of the decking board as the screw is driven, eliminating the need for a separate countersinking step in most applications. The Type-17 point also allows fast starts without pre-drilling in most field conditions.

What types of wood is this screw designed to fasten?

This screw is designed for fastening all types of wood decking, including cedar, redwood, and preservative-treated woods, in wood-to-wood applications such as installing deck boards.