Simpson Strong-Drive SDCFC TIMBER-CFC Screw - 0.390 in. x 12 1/2 in., T50, E-Coat by Simpson Strong-Tie is a redesigned structural timber screw engineered for heavy-duty wood-to-wood fastening in demanding applications involving large members such as mass timber, glulam, and engineered wood assemblies. The fully threaded shank delivers exceptional withdrawal resistance throughout the entire fastener length, while the compact cylinder head creates a clean, professional finish whether left exposed or countersunk. With a SawTooth point for fast, low-torque starts and a black e-coat electrocoating finish that satisfies interior dry-service corrosion resistance requirements, this screw is built for reliable, long-term structural performance in timber framing, beam reinforcement, and multi-ply fastening applications.

Key Features

• Compact cylinder head (0.528 in. diameter) - allows the screw to countersink cleanly for a flush or concealed finish, reducing the need for additional finishing work on exposed structural connections
• Heavy-duty, fully threaded shank - thread engagement along the full 12 1/8 in. thread length maximizes withdrawal resistance in large timber members, making it well-suited for beam reinforcement and multi-ply fastening
• SawTooth point design - enables fast starts and easy driving, reducing installation torque and eliminating the need for predrilling in most applications, saving time on heavy timber jobsites
• Black e-coat electrocoating finish - provides a construction-durable, nonmetallic coating for corrosion resistance in interior dry-service applications while enhancing the visual appearance of exposed fasteners
• Deep T50 6-lobe drive recess - delivers a secure, positive engagement between driver and fastener, reducing cam-out risk during high-torque driving into dense timber
• Optimized hardness profile - works alongside the e-coat finish to mitigate the risk of brittle fracture, supporting reliable structural performance over the life of the assembly
• Compliant with CSA O86:24 hydrogen embrittlement requirements - meets current Canadian structural timber standards, broadening the range of code-compliant project applications
• 0.290 in. shank diameter with 0.390 in. overall diameter - sized for structural integrity in mass timber and heavy framing without requiring oversized pilot holes

Why This Product

• The fully threaded shank and SawTooth point work together to make installation into dense mass timber, glulam, and engineered wood faster and more consistent - no predrilling required in most applications, which meaningfully reduces labor time on large timber framing projects.
• The black e-coat electrocoating provides a nonmetallic corrosion-resistant finish that also satisfies aesthetic requirements when fasteners are left exposed - making this screw a practical choice for architecturally visible heavy timber connections in interior dry-service environments.
• Compliance with CSA O86:24 hydrogen embrittlement requirements and an optimized hardness profile address long-term structural reliability concerns that matter on engineered wood, cross-laminated timber, and multi-ply beam assemblies.
• The cylinder head profile and deep 6-lobe recess give installers precise control during driving into large members, reducing the risk of surface damage and stripped recesses that can compromise the finished appearance of structural connections.

Specifications

• Brand: Simpson Strong-Tie
• Product Name: Strong-Drive SDCFC TIMBER-CFC Screw
• Length: 12 1/2 in.
• Thread Length: 12 1/8 in.
• Shank Diameter: 0.290 in.
• Head Diameter: 0.528 in.
• Head Type: Cylinder Head
• Drive Type: T50 6-Lobe
• Point Type: SawTooth Point
• Coating: E-coat Electrocoating
• Finish: E-coat Electrocoating
• Color: Black