Simpson Deck-Drive DCU Composite Screw in Type 316 Stainless Steel is engineered specifically for composite and PVC decking installations where severe corrosion resistance is required. Built by Simpson, this #10 x 2" cap-head fastener delivers a clean, professional finish while standing up to harsh coastal and chloride-heavy environments that would compromise lesser fasteners. The color-matching painted head blends with popular decking manufacturers' boards for a concealed, polished result that looks as good as it performs.

Key Features

• Type 316 Stainless Steel construction - provides severe-level corrosion resistance, making this screw especially well-suited for coastal, saltwater-adjacent, and chemically demanding outdoor environments where chloride exposure is a concern.
• Type-17 Point - penetrates composite and PVC decking cleanly without pre-drilling, saving installation time and reducing the risk of surface cracking or splitting.
• Inverted upper threads (Tri-Lobe design) - clear excess material as the screw seats, preventing unsightly buildup around the head and ensuring a flush, secure installation every time.
• Cap Head with 0.230 in. head diameter - distributes clamping force evenly across the decking surface, helping to firmly anchor boards without over-driving or causing surface damage.
• T20 6-Lobe drive - delivers superior torque transfer compared to standard Phillips or square drives, reducing cam-out and driver bit wear during repetitive fastening tasks.
• Color-matching painted heads - blend with popular composite decking manufacturers' board colors, resulting in a more concealed and professionally finished deck surface.
• Compatible with Deck-Drive Screw Plug Solution - allows for an even more seamless, hidden-fastener appearance when screw plugs are used in conjunction with these screws.

Why This Product

• Designed from the ground up for composite and PVC decking - the Type-17 point and inverted Tri-Lobe threads work together to handle the unique material properties of composite boards, eliminating the need to mix and match fasteners across different decking brands.
• Type 316 stainless steel is the right choice for environments where chlorides, salt air, or chemical exposure would cause standard stainless or coated screws to fail prematurely - giving your deck installation a long service life even in tough coastal conditions.
• The T20 6-Lobe drive and included driver bit mean you can start fastening right away with consistent, cam-out-free performance throughout the job - reducing fatigue and installation errors on large decking projects.
• Color-matched heads and compatibility with the Screw Plug Solution give installers and homeowners the flexibility to achieve either a low-profile painted-head finish or a fully concealed fastening result, meeting a wide range of aesthetic preferences.

Specifications

• Brand: Simpson Strong-Tie
• Screw Size: #10
• Length: 2 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: None
• Country of Origin: Vietnam

Available Pack Options

• DCU2C316: 70 Pk - includes 1 driver bit included
• DCU2P316: 350 Pk - includes 1 driver bit included

Frequently Asked Questions

What types of decking are the Deck-Drive DCU screws designed for?

The Deck-Drive DCU is engineered for use with all types of composite and PVC decking. The Type-17 point and Tri-Lobe thread design are specifically optimized for the material properties of these board types, making it a versatile single-screw solution across composite decking brands.

Why is Type 316 stainless steel recommended over other grades for deck fasteners?

Type 316 stainless steel offers severe-level corrosion resistance, with enhanced protection against chlorides compared to Type 304. This makes it the preferred choice for decking installations in coastal areas, near pools, or in any environment where salt air or chemical exposure is present.

Do the screw heads blend in with composite decking boards?

Yes. The DCU screws feature color-matching painted cap heads designed to blend with popular composite decking manufacturers' board colors. For an even more concealed finish, they are also compatible with the Deck-Drive Screw Plug Solution.

What drive bit does this screw use, and is one included?

The Deck-Drive DCU uses a T20 6-Lobe drive, which provides strong torque transfer and minimizes cam-out during installation. One T20 6-Lobe driver bit is included with your order. A replacement bit is also available separately - see the Related Products section below.

Downloads and Resources

• Composite-Decking Color Cross-Reference chart

Related Products

• BIT20T-2-R2 - Replacement T20 6-Lobe driver bit
• Deck-Drive Screw Plug Solution - Color-matched screw plugs for a fully concealed fastening finish