Simpson Deck-Drive DCU Composite Screw in #10 x 2-3/4" with Type 316 Stainless Steel finish and Gray 01 painted cap head is engineered specifically for composite and PVC decking installations where a clean, professional result is essential. Built from Type 316 stainless steel, this fastener delivers severe-level corrosion resistance that stands up to chlorides, salt air, and demanding coastal or marine environments. The color-matched Gray 01 head blends seamlessly with popular composite deck board brands, keeping fasteners discreet while the precision engineering ensures a secure, flush installation every time.

Key Features

• Type 316 Stainless Steel material - provides severe-level corrosion resistance suited for marine, coastal, and salt-air environments where standard fasteners would fail prematurely
• Type-17 Point - penetrates composite and PVC decking cleanly without pre-drilling, saving installation time and reducing surface damage
• Inverted upper tri-lobe threads - clear excess material from the surface for a flush, clean finish that looks professional and requires less cleanup
• Cap head design with 0.230 in. head diameter - delivers strong bearing surface for secure holding power while sitting flush against composite deck boards
• T20 6-Lobe drive type - provides high torque transfer and reduces cam-out during installation, giving the installer better control and fewer stripped heads
• Gray 01 color-matching painted head - blends with popular composite decking manufacturers' boards for a more concealed, finished appearance
• 2-3/4 in. length - sized for effective penetration into composite deck boards and underlying framing for a strong, lasting hold

Why This Product

• Designed for all types of composite and PVC decking, this screw eliminates the need to match multiple fastener types to different decking brands - one engineered solution works across applications
• The Type 316 stainless steel construction specifically resists chloride-heavy environments, making it the right choice for docks, seaside decks, pool surrounds, and coastal construction where corrosion is a constant concern
• The combination of a Type-17 point and inverted upper threads means composite material is cleared away cleanly during installation, preventing mushrooming or raised edges around the fastener head
• Color-matching painted heads are engineered to blend with popular decking brands, delivering a concealed fastener appearance that adds a professional, finished look to composite deck installations

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 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Color: Gray 01

Available Pack Options

• DCU234C316GR01: 70 Pk - includes 1 driver bit included
• DCU234P316GR01: 350 Pk - includes 1 driver bit included
• DCU234MB316GR01: 1750 Pk - includes 2 driver bits included

Approved Applications

• Marine
• Decks - Deck Boards Composite
• Coastal / Salt Air

Frequently Asked Questions

Why is Type 316 stainless steel specified for composite decking in coastal areas?

Type 316 stainless steel contains molybdenum, which gives it severe-level corrosion resistance against chlorides found in saltwater, sea air, and pool environments. This makes it especially well-suited for marine, coastal, and salt-air applications where lesser stainless grades or coated fasteners would degrade over time.

Do I need to pre-drill composite or PVC deck boards before driving these screws?

No. The Type-17 point is specifically designed to penetrate composite and PVC decking without the need for pre-drilling. The point cuts into the material cleanly, simplifying installation and reducing the number of steps required on the job.

What driver bit is compatible with the T20 6-Lobe drive on this screw?

This screw uses a T20 6-Lobe drive. The compatible replacement driver bit is the BIT20T-2-R2, which is recommended for use with these Deck-Drive DCU composite screws.

Can the Gray 01 head color be matched with composite deck board plugs for a fully concealed look?

Yes. Color-matching DCU screw plugs are available through the Deck-Drive Screw Plug Solution, allowing the fastener heads to be covered for an even more seamless and professional finish on composite deck surfaces.

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 screw plugs for a concealed finish