The Simpson Strong-Drive SDCFC TIMBER-CFC Screw - 0.390 in. x 31 1/2 in., T50, E-Coat by Simpson Strong-Tie is a heavy-duty structural fastener engineered for large timber framing members, mass timber construction, and engineered wood assemblies. At nearly 32 inches in length with a fully threaded shank, this long timber screw delivers exceptional withdrawal resistance in wood-to-wood connections, beam reinforcement, and cross-laminated timber applications. The black e-coat electrocoating finish provides a construction-durable, nonmetallic coating suited for interior dry-service environments while keeping the installation looking clean whether the head is left exposed or countersunk. This package includes 50 screws plus a T50 6-lobe driver bit, making it a complete solution for professional timber framing crews and structural carpentry projects.

Key Features

• Compact cylinder head design - helps countersink the screw flush with the surface for a clean, finished appearance whether exposed or concealed
• Heavy-duty, fully threaded shank with 30 1/2 in. thread length - maximizes grip and superb withdrawal resistance throughout the entire fastening depth in structural wood members
• SawTooth point - ensures fast starts and easy driving, reducing installation torque and eliminating the need for predrilling in most applications
• Black e-coat electrocoating finish - provides a construction-durable nonmetallic coating that resists corrosion in interior dry-service applications while enhancing aesthetics in exposed timber
• Deep T50 6-lobe recess - delivers a secure, slip-resistant drive connection that reduces cam-out during high-torque installation of long structural screws
• Optimized hardness profile - combined with the e-coat finish, it helps mitigate the risk of brittle fracture for reliable, long-term structural performance
• Compliant with CSA O86:24 hydrogen embrittlement requirements - meets Canadian engineered wood design standard requirements for structural confidence
• 0.390 in. diameter x 31 1/2 in. length - sized for demanding connections involving large structural members such as glulam beams and multi-ply engineered wood
• 50-pack box quantity - provides a job-site-ready supply for high-volume timber framing and beam fastening work

Why This Product

• Designed for mass timber and cross-laminated timber applications where conventional fasteners fall short - the 31 1/2 in. fully threaded shank penetrates deep into large structural members, creating the withdrawal resistance required for engineered wood connections
• The SawTooth point eliminates predrilling in most applications, saving significant setup time and labor cost on large timber framing projects
• The black e-coat electrocoating is both a functional corrosion barrier for interior dry-service use and an aesthetic choice for exposed timber finishes - no additional finishing is needed when screws are left visible
• CSA O86:24 compliance and an optimized hardness profile address hydrogen embrittlement concerns, giving structural engineers and installers confidence in long-term performance for glulam, heavy timber, and multi-ply fastening assemblies

Specifications

• Brand: Simpson Strong-Tie
• Model Number: SDCFC10X800
• Product Name: Strong-Drive SDCFC TIMBER-CFC Screw
• Length: 31 1/2 in.
• Shank Diameter: 0.290 in.
• Head Diameter: 0.528 in.
• Thread Length: 30 1/2 in.
• Head Type: Cylinder Head
• Drive Type: T50 6-Lobe
• Point Type: SawTooth Point
• Coating: E-coat Electrocoating
• Finish: E-coat Electrocoating
• Color: Black