Simpson Deck-Drive DCU Composite Screw in Tan, #10 x 2-3/4", Type 305 Stainless Steel is engineered for secure, clean fastening in all types of composite and PVC decking applications. Built from Type 305 stainless steel, this cap-head screw delivers exceptional corrosion resistance - making it especially well-suited for coastal and high-chloride environments where standard fasteners would fail prematurely. The color-matching tan painted head blends seamlessly with popular composite deck board manufacturers, resulting in a concealed, professional finish that elevates the final appearance of any deck project.

Key Features

• Type 305 Stainless Steel material - provides superior corrosion resistance in outdoor decking environments, particularly in areas exposed to chlorides such as pool decks and coastal installations
• Type-17 Point - penetrates composite decking cleanly without pre-drilling, saving installation time and reducing labor effort
• Inverted upper threads (Tri-Lobe Thread design) - clear excess decking material during installation, producing a flush, clean finish without surface debris or raised edges
• Cap Head with 0.230 in. head diameter - provides consistent bearing surface for a secure hold while keeping the fastener low-profile against the deck surface
• T20 6-Lobe drive type - reduces cam-out during driving, giving installers greater control and a more efficient fastening experience
• Tan color-matching painted head - blends with popular composite decking brands for a more concealed, professional-looking installation
• 2-3/4 in. length - sized to achieve proper penetration depth through composite deck boards into the substructure below

Why This Product

• Designed specifically for composite and PVC decking - this screw is engineered as a dedicated composite deck fastener, eliminating the need to mix and match different screw types across a single project
• Suited for chloride-heavy environments - the Type 305 stainless steel construction makes this an appropriate choice for pool surrounds, waterfront decks, and other settings where salt air or chemical exposure accelerates corrosion in lesser materials
• Clean installation without extra cleanup - the inverted upper threads actively clear excess composite material from the hole as the screw drives, reducing finishing work and delivering a tighter, cleaner seat
• Color-coordinated finish for a polished result - the tan painted cap head is matched to popular composite decking product lines, making it easy to achieve a consistent, finished look without visible hardware distracting from the deck surface

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
• Material: Type 305 Stainless Steel
• Finish: Type 305 Stainless Steel
• Color: Tan

Available Pack Options

• DCU234P305TN: 350 Pk - includes 1 driver bit included
• DCU234MB305TN: 1750 Pk - includes 2 driver bits included

Approved Applications

• Decks - Deck Boards Composite

Frequently Asked Questions

Is this screw compatible with PVC decking as well as composite decking?

Yes. The Deck-Drive DCU Composite Screw is designed to work with all types of composite and PVC decking materials. The Type-17 point and Tri-Lobe thread design are engineered to penetrate and seat cleanly in both material types.

Why is Type 305 stainless steel recommended for composite deck fasteners?

Type 305 stainless steel provides strong corrosion resistance for outdoor decking environments, and is especially suited for applications where chlorides are present - such as coastal areas, poolside decks, and humid climates. This makes it a more durable long-term choice compared to standard coated fasteners in these conditions.

What does the T20 6-Lobe drive require, and what replacement bit can I use?

The T20 6-Lobe drive is designed to reduce cam-out and provide better torque transfer during installation. A compatible replacement driver bit is the BIT20T-2-R2, which is matched to this drive type for consistent performance.

Can I find color-matching plug solutions to cover the screw heads after installation?

Yes. Color-matching DCU Screw Plugs are available that pair with these Deck-Drive screws for a fully concealed fastening result. See the Deck-Drive Screw Plug Solution 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 - Compatible color-matching screw plugs for a concealed finish