Simpson #10 x 3-1/2" Bugle-Head Wood Deck Screw with #2 Square Drive in Type 305 Stainless Steel is a premium exterior fastener engineered by Simpson Strong-Tie for reliable, corrosion-resistant wood deck construction. Built from Type 305 stainless steel, this screw delivers long-term performance in outdoor environments where moisture and exposure to the elements would quickly degrade standard fasteners. Whether you are installing cedar, redwood, or preservative-treated lumber, this deck screw is designed to fasten wood-to-wood securely while sitting flush with the surface for a clean, professional finish.

Key Features

• Type 305 Stainless Steel material - provides strong corrosion resistance for exterior decking applications, helping your deck surface hold up against moisture, humidity, and outdoor weathering over time.
• Bugle head design with 0.340" head diameter - countersinks flush into wood decking without requiring a countersink bit, producing a smooth, snag-free surface underfoot.
• Type-17 cutting point - bores into wood quickly for fast starts and reduces the need for pre-drilling in most mid-board applications, speeding up installation.
• Coarse thread pattern - draws decking boards and other wood materials tightly down to the substrate, minimizing gaps and improving the structural integrity of the finished deck surface.
• #2 Square drive - provides positive bit engagement with reduced cam-out compared to Phillips drive, giving installers better torque control and a cleaner drive even in overhead or awkward positions.
• 3-1/2" length with #10 screw size - offers deep penetration into decking substrates, creating a strong mechanical connection between the deck board and the framing below.
• Compatible with cedar, redwood, and preservative-treated woods - versatile enough to work across the most common deck board species and treatment types without risk of material incompatibility.
• #2 square driver bit included - means you can begin driving screws immediately without hunting for a separate bit, reducing setup time on the job.

Why This Product

• Purpose-built for outdoor deck fastening - the combination of Type 305 stainless steel construction and a bugle head profile makes this screw a natural fit for deck board installation in exposed conditions where rust and surface protrusion are both concerns.
• Works with the widest range of deck board materials - explicitly rated for cedar, redwood, and preservative-treated lumber, so you can use one screw across mixed-species or treated-wood deck projects without switching fasteners.
• Square drive reduces installer frustration - the #2 square recess grips the bit firmly, minimizing slipping and stripped heads that slow down the work and damage board surfaces.
• Simpson Strong-Tie engineering behind the design - a brand recognized in structural construction brings that same focus on connection performance to this deck screw, offering confidence that the fastener is designed to hold rather than just to drive.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #10
• Length: 3-1/2 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: 56
• Country of Origin: Taiwan

Available Pack Options

• S10350DB1: 1 Lb - includes #2 square driver bit included (replacement bit model BIT2S-2-R2)
• S10350DB5: 5 Lb - includes #2 square driver bit included (replacement bit model BIT2S-2-R2)
• S10350DBB: 1000 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 this screw be used with pressure-treated lumber?

Yes. This screw is specifically approved for use with preservative-treated woods, as well as cedar and redwood deck boards. The Type 305 stainless steel material resists the corrosive effects that can occur when standard steel fasteners contact pressure-treated wood over time.

What driver bit does this screw require, and is one provided?

This screw uses a #2 square drive. A #2 square driver bit is included with each package so you can begin installation right away. If you need a replacement bit, the compatible model is BIT2S-2-R2.

Does the bugle head sit flush with the deck surface after driving?

Yes. The bugle head profile is designed for flush countersinking into wood decking, so the screw head sits at or just below the board surface without raised edges that could catch feet or create surface irregularities.

Do I need to pre-drill before driving this screw?

The Type-17 cutting point is designed for fast starts and typically allows direct driving without pre-drilling in most applications. However, pre-drilling is recommended near board ends to help prevent wood splitting, particularly with harder or drier lumber species.