Simpson Deck-Drive DCU Composite Screw in #10 x 2-3/4" with Type 305 Stainless Steel finish is engineered specifically for composite and PVC deck board installations where a clean, professional result matters. Built by Simpson with a Type-17 penetrating point and inverted upper threads that clear away excess material, this cap-head fastener drives smoothly into composite decking surfaces without the mushrooming or surface damage common with standard screws. The Brown 05 color-matching painted head blends with popular composite deck boards from leading manufacturers, delivering a concealed, finished appearance that elevates the look of any deck project. Type 305 stainless steel construction provides dependable corrosion resistance, making this screw especially well-suited for outdoor decking environments exposed to chlorides, moisture, and coastal conditions.

Key Features

• Type 305 Stainless Steel material - delivers strong corrosion resistance for outdoor composite decking applications, including environments with chloride exposure such as coastal or poolside installations
• Type-17 Point - penetrates composite and PVC deck boards cleanly without pre-drilling, reducing installation time and effort on the job
• Inverted upper Tri-Lobe Threads - engineered to clear excess composite material during driving, ensuring a flush, secure seat and a clean finished surface
• Cap Head with 0.230 in. head diameter - provides a low-profile bearing surface that sits flush and neat against composite deck boards without over-driving
• T20 6-Lobe Drive Type - delivers positive bit engagement, reducing cam-out and improving torque transfer for faster, more consistent installation
• Brown 05 color-matching painted head - blends with popular composite decking brands for a more concealed, professional finish that hides fasteners from view
• 2-3/4 in. length - sized for reliable penetration and holding power through standard composite deck board thicknesses into the framing below

Why This Product

• Designed exclusively for composite and PVC decking, this screw eliminates the need to mix and match fasteners across different board types - one screw handles all your composite deck board applications from a single trusted source
• The combination of a Type-17 point and inverted clearing threads means composite material is removed cleanly as the screw seats, preventing surface buildup and the unsightly raised rings that can appear with general-purpose screws
• Type 305 stainless steel is particularly suited for chloride-heavy environments - poolside decks, coastal properties, and high-humidity outdoor spaces where standard steel fasteners would corrode prematurely
• Color-matched Brown 05 painted heads blend with popular manufacturers' composite decking for a finished appearance that looks intentional, not fastener-forward - a detail that matters on high-visibility residential and commercial deck surfaces

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #10
• Length: 2-3/4 in.
• Material: Type 305 Stainless Steel
• Finish: Type 305 Stainless Steel
• Head Type: Cap Head
• Head Diameter: 0.230 in.
• Drive Type: T20 6-Lobe
• Thread Type: Tri-Lobe Threads
• Point Type: Type-17 Point
• Color: Brown 05

Available Pack Options

• DCU234P305BR05: 350 Pk - includes 1 driver bit included
• DCU234MB305BR05: 1750 Pk - includes 2 driver bits included

Approved Applications

• Decks - Deck Boards Composite

Frequently Asked Questions

Why is Type 305 stainless steel recommended for composite decking applications?

Type 305 stainless steel provides strong corrosion resistance across a wide range of outdoor environments, and is especially suited for applications where chlorides are present - such as coastal decks, poolside installations, or areas exposed to de-icing salts. Using a corrosion-resistant fastener in composite decking helps ensure the structural integrity of the connection over time without rust staining on the deck surface.

Do I need to pre-drill composite deck boards before driving this screw?

No pre-drilling is required. The Type-17 point on the Deck-Drive DCU Composite Screw is specifically engineered to penetrate composite and PVC decking materials directly. The inverted upper Tri-Lobe Threads then clear excess composite material during driving to seat the screw cleanly and securely without surface damage.

What driver bit does this screw require?

This 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.

Will the Brown 05 head color match my composite deck boards?

The Brown 05 painted cap head is designed to blend with popular composite decking manufacturers' board colors. For a full reference of which composite decking brands and colors this shade is matched to, see the Composite-Decking Color Cross-Reference chart linked in the Downloads and Resources section below. Compatible color-matching DCU Screw Plugs are also available for an even more concealed finish - see the Deck-Drive Screw Plug Solution link in Related Products.

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 - Color-matching DCU Screw Plugs for a fully concealed finish