Simpson Deck-Drive DCU Composite Screw in Gray, #10 x 2-3/4" is a purpose-built fastener from Simpson designed to deliver clean, professional results when installing composite or PVC deck boards. Featuring a Quik Guard coating that resists medium levels of corrosion, this carbon-steel screw is engineered for all types of composite decking applications where a flush, color-matched finish matters as much as structural performance. The painted cap head blends with popular decking brands, making it a go-to choice for contractors and DIYers who want fastening hardware that disappears into the deck surface.

Key Features

• Quik Guard Coating - provides medium corrosion resistance, making these screws well-suited for outdoor deck environments exposed to moisture and weather
• Type-17 Point - penetrates composite and PVC decking cleanly without pre-drilling, speeding up installation and reducing labor time
• Inverted Upper Tri-Lobe Threads - clear excess composite material as the screw seats, resulting in a clean, flush surface free of raised material around the head
• Cap Head with Gray Painted Finish - color-matched to blend with popular composite decking manufacturers' boards, giving the finished deck a concealed, professional appearance
• T20 6-Lobe Drive - provides high torque transfer with reduced cam-out risk, improving driver bit engagement and installation control
• 0.230" Head Diameter - sized specifically for composite deck boards, ensuring the head seats properly without oversizing the surface impression
• #10 Screw Size at 2-3/4" Length - matched to standard composite decking thickness requirements for secure, code-compatible fastening

Why This Product

• Engineered specifically for composite and PVC decking - eliminates the guesswork of choosing a general-purpose screw that may not seat correctly or resist the unique properties of composite board materials
• The Quik Guard coating paired with carbon-steel construction delivers medium-level corrosion resistance suited for typical outdoor deck exposure, helping fasteners maintain holding strength over time
• The color-matching gray painted cap head conceals the fastener against the deck surface, producing a cleaner finished appearance without plug covers or additional concealment steps
• The combination of a Type-17 point and inverted upper threads means fewer surface defects and less cleanup after installation - composite material clears away rather than bunching around the screw head

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
• Coating: Quik Guard Coating
• Finish: Quik Guard Coating
• Color: Gray

Available Pack Options

• DCU234GRR70: 70 Pk - includes 1 driver bit included
• DCU234GRR350: 350 Pk - includes 1 driver bit included
• DCU234GRMB: 1750 Pk - includes 2 driver bits included

Approved Applications

• Decks - Deck Boards Composite

Frequently Asked Questions

What types of decking material is this screw compatible with?

The Deck-Drive DCU Composite Screw is designed to resist medium levels of corrosion and is compatible with all types of composite or PVC decking. The Type-17 point is engineered to penetrate composite decking cleanly, and the inverted upper threads clear excess material for a flush, secure installation.

Why does this screw have inverted upper threads?

The inverted upper Tri-Lobe threads are engineered to clear away excess composite material as the screw is driven in. This prevents material from bunching around the head and ensures a clean, flush finish at the deck surface - an important consideration with composite and PVC boards that behave differently than natural wood under fastener pressure.

What driver bit does this screw require?

The Deck-Drive DCU Composite Screw uses a T20 6-Lobe drive. A compatible replacement driver bit is available - see the Related Products section below for the recommended bit option.

Does the gray color match specific composite decking brands?

Yes - the cap heads are painted gray to match popular composite decking manufacturers' boards. Simpson offers a Composite-Decking Color Cross-Reference chart (available in the Downloads section below) to help match screw color to specific decking products. The Deck-Drive DCU is available in a wide range of colors to suit different decking systems.

Downloads and Resources

• Composite-Decking Color Cross-Reference chart

Related Products

• BIT20T-2-R2 - Compatible T20 6-Lobe replacement driver bit
• Deck-Drive Screw Plug Solution - Compatible color-matching DCU Screw Plugs