The Simpson Deck-Drive DCU Composite Screw in #10 x 2-3/4", Brown 05, Type 316 Stainless Steel delivers severe-level corrosion resistance engineered specifically for composite and PVC decking installations. Designed by Simpson for demanding outdoor environments - including coastal and chloride-exposed applications - this cap head fastener combines a Type-17 point for clean penetration with inverted upper threads that clear excess material, leaving a secure and professional finish. The color-matching painted head in Brown 05 blends seamlessly with popular composite decking brands, making it a go-to choice for contractors and DIYers who want concealed, polished results without sacrificing structural integrity.

Key Features

• Type 316 Stainless Steel material - provides severe-level corrosion resistance, making this screw especially well-suited for chloride-rich environments such as coastal and poolside deck installations where standard fasteners can fail prematurely.
• Type-17 point - pierces composite and PVC decking cleanly without splitting or cracking the material, reducing prep work and improving installation speed.
• Inverted upper threads (Tri-Lobe Thread design) - clear excess decking material from around the fastener during installation, ensuring a flush, secure seat and a clean finished surface.
• T20 6-Lobe drive type - provides high torque transfer with reduced cam-out risk, giving installers better control and a cleaner drive on every fastener.
• Cap Head design with 0.230 in. head diameter - sits low against the deck surface for a streamlined, professional appearance that minimizes snagging and tripping hazards.
• Brown 05 color-matching painted head - blends with popular composite decking manufacturers' colors for a more concealed, finished look that enhances curb appeal.
• 2-3/4 in. length - sized to deliver solid pull-through resistance into the decking substrate while maintaining a clean topside appearance.

Why This Product

• Purpose-built for composite and PVC decking - the Type-17 point and inverted Tri-Lobe threads are engineered specifically for these materials, eliminating the need to mix and match fasteners across different decking products.
• Handles chloride and salt exposure - Type 316 stainless steel construction resists corrosion in seaside, poolside, and chemically exposed environments where lesser materials degrade quickly.
• Delivers a cleaner finished appearance - the Brown 05 painted cap head is matched to popular decking brands, giving the installed deck a more professional, color-coordinated look compared to bare metal fasteners.
• Engineered for reliable, consistent installation - the T20 6-Lobe drive reduces cam-out and the thread design clears material as the screw seats, minimizing installation errors and rework on composite decking projects.

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
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Color: Brown 05

Available Pack Options

• DCU234C316BR05: 70 Pk - includes 1 driver bit included
• DCU234P316BR05: 350 Pk - includes 1 driver bit included
• DCU234MB316BR05: 1750 Pk - includes 2 driver bits included

Approved Applications

• All types of composite decking installation
• PVC decking fastening
• Outdoor deck projects in coastal or chloride-exposed environments
• Applications requiring severe-level corrosion resistance
• Installations where color-matched concealed fastening is desired

Frequently Asked Questions

What makes this screw suitable for coastal or poolside deck installations?

This screw is manufactured from Type 316 stainless steel, which provides severe-level corrosion resistance and is especially suited for environments with chlorides - such as coastal, marine, or poolside settings where standard fasteners are prone to rust and premature failure.

What drive bit does this screw require?

This screw uses a T20 6-Lobe drive. The compatible replacement driver bit is the BIT20T-2-R2, which can be found in the Related Products section below.

How does the Brown 05 color work with composite decking brands?

The painted cap head in Brown 05 is designed to match popular composite decking manufacturers' colors for a more concealed, professional finish. Refer to the Composite-Decking Color Cross-Reference chart available in the Downloads section to confirm compatibility with your specific decking brand.

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

The inverted upper Tri-Lobe threads are engineered to clear excess material from around the fastener during installation into composite and PVC decking. This ensures a clean, flush seat and a secure installation without surface buildup or raised material around the screw head.

Downloads and Resources

• Composite-Decking Color Cross-Reference chart

Related Products

• BIT20T-2-R2 - Compatible T20 6-Lobe driver bit for use with this screw
• Deck-Drive Screw Plug Solution - Color-matching DCU screw plugs compatible with this fastener