The Simpson Deck-Drive DCU Composite Screw in Gray 04 is a purpose-engineered fastener built for reliable, attractive installation in composite and PVC deck boards. Featuring a Quik Guard coating for medium-level corrosion resistance, this carbon-steel screw combines a Type-17 point for clean penetration with inverted upper threads that clear away excess material as you drive - resulting in a flush, professional finish every time. The color-matching painted cap head in Gray 04 blends seamlessly with popular composite decking products, keeping the fastener nearly invisible on your finished deck surface.

Key Features

• Quik Guard Coating - provides medium corrosion resistance, making this screw suitable for outdoor composite and PVC deck board applications exposed to the elements
• Type-17 Point - self-starting tip penetrates composite decking material cleanly without pre-drilling, saving installation time and effort
• Tri-Lobe Threads with Inverted Upper Threads - engineered to clear excess composite material during driving, preventing surface mushrooming and delivering a clean, flush install
• Cap Head Design (0.230 in. diameter) - wider bearing surface seats firmly against the decking face for a secure hold without over-countersinking
• T20 6-Lobe Drive Type - provides excellent bit engagement and torque transfer, reducing cam-out and driver slippage during installation
• Gray 04 Color-Matching Painted Head - blends with popular composite decking manufacturers' board colors for a concealed, finished appearance on the completed deck
• 2-3/4 in. Length, #10 Screw Size - sized for effective fastening depth into composite deck boards and the structural framing below
• Available in a wide range of colors - lets you match screws precisely to different decking product lines without mixing fastener types

Why This Product

• Engineered specifically for composite and PVC decking - eliminates the guesswork of selecting a general-purpose screw that may not seat correctly or resist corrosion adequately in an outdoor deck environment
• The inverted upper thread design solves a common composite decking problem - excess material buildup around the screw head - by actively clearing debris during installation so the head sits flush without additional cleanup
• Color-matching Gray 04 painted heads mean the fasteners become part of the finished look rather than an eyesore, delivering the clean aesthetic composite decking is known for
• Quik Guard coating provides the medium-level corrosion resistance required for typical outdoor decking exposures, protecting the screw's integrity and appearance over the long term

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #10
• Length: 2-3/4 in.
• Head Type: Cap Head
• Head Diameter: 0.230 in.
• Drive Type: T20 6-Lobe
• Thread Type: Tri-Lobe Threads
• Point Type: Type-17 Point
• Coating/Finish: Quik Guard Coating
• Color: Gray 04

Available Pack Options

• DCU234GR04R70: 70 Pk - includes 1 driver bit included
• DCU234GR04R350: 350 Pk - includes 1 driver bit included
• DCU234GR04MB: 1750 Pk - includes 2 driver bits included

Approved Applications

• Decks - Deck Boards Composite
• PVC decking board fastening

Frequently Asked Questions

What type of decking is the Deck-Drive DCU Composite Screw designed for?

This screw is designed for all types of composite or PVC decking. The Type-17 point and Tri-Lobe thread geometry are specifically engineered to penetrate and fasten composite deck board material cleanly and securely.

Why does this screw have inverted upper threads?

The inverted upper threads are engineered to clear excess composite material that is displaced as the screw is driven into the deck board. This prevents material from piling up around the head, ensuring the cap head seats flush for a clean, professional installation result.

What driver bit is recommended for installing this screw?

This screw uses a T20 6-Lobe drive type. A compatible replacement driver bit is listed in the Related Products section below for easy reference.

How does the Quik Guard coating protect against corrosion in outdoor decking applications?

The Quik Guard coating is formulated to resist medium levels of corrosion, making it well-suited for typical outdoor composite and PVC deck board installations where the fasteners are exposed to moisture and weather over time.

Downloads and Resources

• Composite-Decking Color Cross-Reference Chart

Related Products

• BIT20T-2-R2 - compatible T20 6-Lobe replacement driver bit for driving DCU composite screws
• Deck-Drive Screw Plug Solution - color-matching DCU screw plugs compatible with this fastener for a fully concealed deck surface