Simpson Deck-Drive DCU Composite Screw in #10 x 2-3/4" with Type 305 Stainless Steel finish and Brown 01 color is engineered specifically for composite and PVC decking installations where a clean, professional appearance and long-lasting corrosion resistance are essential. The Type 305 stainless steel construction provides outstanding resistance to corrosion - making these screws especially well-suited for coastal, poolside, and other environments where chloride exposure is a concern. With a color-matching painted cap head in Brown 01, these fasteners blend seamlessly with popular composite decking manufacturers' boards, delivering a concealed, finished look that elevates the appearance of any deck surface.

Key Features

• Type 305 Stainless Steel material - provides strong corrosion resistance in outdoor environments, including areas exposed to chlorides such as coastal or poolside deck applications
• Type-17 Point - penetrates composite and PVC decking cleanly without pre-drilling, saving installation time and reducing material stress
• Tri-Lobe Thread design - engineered to grip composite decking material firmly, creating a secure, stable connection that resists pull-through and loosening over time
• Inverted upper threads - clear excess composite material during installation, ensuring a clean, flush seating of the screw head and reducing surface damage
• T20 6-Lobe drive type - provides excellent bit engagement and torque transfer, reducing cam-out and making installation more efficient with less fatigue
• Cap Head profile with 0.230 in. head diameter - seats flush and securely against composite decking surfaces for a refined, professional finish
• Brown 01 color-matching painted heads - blend with popular composite deck board colors for a more concealed fastening appearance that enhances curb appeal
• 2-3/4 in. length - sized appropriately for composite deck board applications, offering sufficient penetration depth for a strong, lasting hold

Why This Product

• Designed exclusively for composite and PVC decking - the Type-17 point and Tri-Lobe threads work together to handle the specific material properties of composite boards without cracking, mushrooming, or requiring pre-drilling
• The Type 305 stainless steel finish makes this screw a smart choice for high-moisture or chloride-rich environments where standard carbon steel fasteners would corrode and stain deck surfaces over time
• Color-matching Brown 01 painted heads reduce the visual impact of fasteners on the finished deck surface, producing the clean, professional appearance that composite decking is chosen for in the first place
• The inverted upper thread design actively clears excess composite material during installation, eliminating the mushrooming and raised edges around screw heads that can occur with general-purpose screws used on composite boards

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: Brown 01

Available Pack Options

• DCU234P305BR01: 350 Pk - includes 1 driver bit included
• DCU234MB305BR01: 1750 Pk - includes 2 driver bits included

Approved Applications

• Decks - Deck Boards Composite

Frequently Asked Questions

Are these screws suitable for use near saltwater or pools?

Yes. The Type 305 stainless steel construction provides strong corrosion resistance and is especially suited for environments with chloride exposure, such as coastal or poolside composite deck installations.

Do I need to pre-drill holes in my composite decking before installing these screws?

No. The Type-17 point on the Deck-Drive DCU is engineered to penetrate composite and PVC decking directly without pre-drilling, simplifying and speeding up installation.

What driver bit do I need for these screws?

These screws use a T20 6-Lobe drive, which requires a compatible T20 6-Lobe driver bit for installation. A compatible replacement bit is listed in the Related Products section below.

What is the purpose of the inverted upper threads on the DCU screw?

The inverted upper threads are engineered to clear excess composite material as the screw is driven in. This prevents the material from mushrooming up around the screw head, resulting in a clean, flush, and secure installation on composite and PVC deck boards.

Downloads and Resources

• Composite-Decking Color Cross-Reference chart

Related Products

• BIT20T-2-R2
• Deck-Drive Screw Plug Solution