Product Description
The Simpson Deck-Drive DCU Composite Screw in #10 x 2-3/4" with Type 305 Stainless Steel finish is engineered specifically for fastening composite and PVC deck boards, delivering a clean, professional result in environments where corrosion resistance is critical. Featuring a Type-17 point for effortless penetration into composite materials and inverted upper threads that clear excess material during installation, this screw is designed to eliminate the common frustrations of composite deck fastening - no pre-drilling headaches, no surface tear-out, and no mixing and matching fasteners across different decking brands. The 305 stainless steel construction provides reliable protection against rust and oxidation, making it especially well-suited for coastal settings, poolside decks, and other applications exposed to chlorides or persistent moisture.
Key Features
- Type 305 Stainless Steel material - delivers strong corrosion resistance for long-term performance in outdoor environments and areas with chloride exposure such as coastal or poolside decks
- Type-17 point - penetrates composite and PVC decking without pre-drilling, speeding up installation and reducing labor
- Inverted upper threads - clear excess composite material during driving to produce a clean, flush surface with no raised or torn edges
- Cap head with 0.230 in. head diameter - provides a low-profile, secure seating that sits cleanly against the deck board surface
- T20 6-Lobe drive type - provides positive engagement with the bit, reducing cam-out and improving driving consistency across long deck installations
- Tri-Lobe threads - grip composite and PVC decking securely, reducing fastener wobble and ensuring a stable, lasting hold
- 2-3/4 in. length - sized to provide proper penetration depth for standard composite decking board thicknesses
- Compatible with color-matching painted heads - available options to blend with popular composite decking manufacturers' colors for a more concealed, professional finish
Why This Product
- Designed exclusively for composite and PVC decking - the Type-17 point and inverted upper threads work together to prevent surface damage and material buildup that standard screws cause in composite materials
- A single screw solution for all composite decking brands - eliminates the need to stock multiple fastener types when working across different manufacturers' decking products
- Type 305 stainless steel is particularly well-suited for chloride-rich environments - ideal for decks near saltwater, pools, or in humid coastal climates where standard fasteners corrode prematurely
- The T20 6-Lobe drive and cap head combination reduces installation fatigue and cam-out on large deck projects, maintaining control and consistency from the first board to the last
Specifications
- Brand: Simpson Strong-Tie
- Screw Size: #10
- Length (in.): 2 3/4
- Material: Type 305 Stainless Steel
- Finish: Type 305 Stainless Steel
- Head Type: Cap Head
- Head Diameter (in.): 0.230
- Drive Type: T20 6-Lobe
- Thread Type: Tri-Lobe Threads
- Point Type: Type-17 Point
- Color: None
Available Pack Options
- DCU234C305: 70 Pk - includes 1 driver bit included
- DCU234P305: 350 Pk - includes 1 driver bit included
- DCU234MB305: 1750 Pk - includes 2 driver bits included
Approved Applications
- Decks - Deck Boards Composite
Frequently Asked Questions
- Do I need to pre-drill composite decking before driving these screws?
- No pre-drilling is required. The Type-17 point is engineered to penetrate composite and PVC decking directly, saving time and reducing steps during installation.
- Why do these screws have inverted upper threads?
- The inverted upper threads are specifically engineered to clear excess composite material as the screw is driven, ensuring a clean and secure installation without material buildup or surface disruption around the screw head.
- Are these screws suitable for use near saltwater or pools?
- Yes. The Type 305 Stainless Steel construction provides corrosion resistance and is especially suited for applications in environments with chlorides, including coastal and poolside deck installations.
- What driver bit is recommended for these screws?
- These screws use a T20 6-Lobe drive. The compatible replacement bit is listed in the Related Products section below for convenient reference.
Downloads and Resources
Related Products
- BIT20T-2-R2 - Compatible T20 6-Lobe driver bit
- Deck-Drive Screw Plug Solution - Compatible color-matching DCU Screw Plugs
Reviews
FAQs
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