Simpson Deck-Drive DCU Composite Screw - #10 x 2-3/4" in Tan 05 is a Type 305 stainless steel fastener engineered specifically for composite and PVC deck board installation. Designed by Simpson, this cap head screw delivers reliable corrosion resistance in demanding outdoor environments - including areas exposed to chlorides such as coastal and poolside settings - while its color-matched painted head blends seamlessly with popular composite decking brands for a clean, professional look. Whether you're building a new deck or replacing boards, this screw is purpose-built to make composite decking installation faster, neater, and more durable.

Key Features

• Type 305 Stainless Steel construction - provides strong resistance to corrosion and rust, making it well-suited for outdoor decks exposed to moisture, salt air, and other harsh environmental conditions
• Type-17 Point - penetrates composite decking cleanly without pre-drilling, speeding up installation and reducing effort on the job
• Inverted upper Tri-Lobe Threads - clear excess composite material during driving to ensure a flush, secure, and clean finished surface with no unsightly material buildup
• T20 6-Lobe drive - reduces cam-out and slipping during installation, giving the installer better torque control and a more consistent result across every fastener
• Cap Head design with 0.230" head diameter - sits low and flush against the decking surface for a refined, professional appearance without raised or protruding fastener heads
• Tan 05 color-matched painted head - blends with popular composite decking manufacturers' products so fasteners stay visually concealed, delivering a more polished finished deck
• 2-3/4" length - provides appropriate penetration depth for secure attachment of composite deck boards to the substructure

Why This Product

• Eliminates the need to match different screw types to different composite decking brands - the DCU is engineered to work across all types of composite and PVC decking, simplifying your material list and reducing procurement headaches
• The combination of Type 305 stainless steel and inverted thread design means you get both long-term corrosion resistance and a clean installation finish - two common pain points with standard deck screws are addressed in a single fastener
• Color-matched Tan 05 painted heads allow the fasteners to disappear visually into the decking surface, avoiding the eyesore of mismatched or visible screw heads on a finished composite deck
• Especially suited for chloride-rich environments such as coastal, seaside, or pool deck applications where standard fasteners corrode prematurely - Type 305 stainless steel holds up where lesser materials fail

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #10
• Length: 2-3/4 in.
• Head Diameter: 0.230 in.
• Head Type: Cap Head
• Drive Type: T20 6-Lobe
• Thread Type: Tri-Lobe Threads
• Point Type: Type-17 Point
• Finish/Material: Type 305 Stainless Steel
• Color: Tan 05
• Country of Origin: Vietnam

Available Pack Options

• DCU234P305TN05: 350 Pk - includes 1 driver bit included
• DCU234MB305TN05: 1750 Pk - includes 2 driver bits included

Approved Applications

• Decks - Deck Boards Composite

Frequently Asked Questions

Is this screw compatible with all composite and PVC decking products?

Yes. The Deck-Drive DCU Composite Screw is engineered for use with all types of composite and PVC decking. The Type-17 point and inverted upper Tri-Lobe Threads are specifically designed to penetrate and seat cleanly in composite materials without requiring pre-drilling or causing surface damage.

Why is Type 305 Stainless Steel recommended for composite deck fasteners?

Type 305 stainless steel offers strong corrosion resistance that is especially suited for outdoor decking environments exposed to moisture and chlorides - such as coastal properties or installations near swimming pools. It provides a long-lasting fastening solution where standard steel screws would corrode over time and potentially stain or weaken the decking material.

What drive bit is needed to install these screws?

These screws use a T20 6-Lobe drive. The compatible replacement driver bit is linked in the Related Products section below. Using the correct bit helps prevent cam-out and ensures a consistent, flush drive every time.

Can I use color-matching plugs with the DCU screw to further conceal the fastener heads?

Yes. The Deck-Drive DCU screw is compatible with color-matching DCU Screw Plugs for an even more concealed finished appearance. See the Deck-Drive Screw Plug Solution linked in the Related Products section for compatible plug options.

Downloads and Resources

• Composite-Decking Color Cross-Reference Chart

Related Products

• BIT20T-2-R2 - Compatible T20 6-Lobe Driver Bit
• Deck-Drive Screw Plug Solution - Color-Matching Plugs