Simpson Strong-Drive SDCFC TIMBER-CFC Screw - 0.315 in. x 11 in. T40, E-Coat by Simpson Strong-Tie is a heavy-duty structural wood screw engineered for demanding large-member fastening applications including mass timber, glulam beams, cross-laminated timber, and heavy timber framing. The redesigned SDCFC Timber-CFC screw features a fully threaded shank for superior withdrawal resistance, a compact cylinder head for a clean exposed or countersunk finish, and a SawTooth point that enables fast starts and easy driving without predrilling in most applications. The black e-coat electrocoating finish delivers a construction-durable nonmetallic surface that resists corrosion in interior dry-service conditions, while the optimized hardness profile helps mitigate the risk of brittle fracture for reliable, long-term structural performance.

Key Features

• Compact cylinder head - helps countersink the screw for a clean finish whether left exposed or fully recessed, delivering a professional look on visible timber connections
• Heavy-duty, fully threaded shank - provides strength along the entire fastener length with superb withdrawal resistance, making it ideal for structural beam reinforcement and multi-ply fastening
• SawTooth point - enables fast starts and easy driving, reducing installation torque and eliminating the need for predrilling in most applications to speed up workflow on the job site
• Black e-coat electrocoating finish - provides a construction-durable nonmetallic coating for corrosion resistance in interior dry-service applications, while also enhancing the aesthetics of exposed fasteners in mass timber and architectural wood installations
• Deep T40 6-lobe recess - delivers a secure, slip-resistant drive connection that reduces cam-out and maintains bit engagement during high-torque installation in dense timber
• Optimized hardness profile - works together with the e-coat finish to help mitigate the risk of brittle fracture, supporting reliable long-term structural performance in heavy timber applications
• Compliant with CSA O86:24 hydrogen embrittlement requirements - meets current Canadian wood design standard requirements, making this screw appropriate for code-sensitive structural projects
• 11 in. length (280 mm) with 10 5/8 in. thread length - provides deep thread engagement across large cross-sections typical of glulam, CLT, and engineered wood multi-ply assemblies

Why This Product

• Built for mass timber and heavy structural fastening - with a 0.315 in. diameter, 11 in. length, and fully threaded shank, this screw is specifically designed for large-member applications like cross-laminated timber, glulam beams, and engineered wood multi-ply assemblies where standard screws fall short
• Eliminates predrilling in most applications - the SawTooth point self-starts in dense wood without requiring a pilot hole, saving significant time during timber framing, beam reinforcement, and wall-to-wall fastening
• Corrosion-resistant for interior construction confidence - the black e-coat electrocoating provides a nonmetallic barrier suited for interior dry-service environments, helping maintain structural integrity and appearance over time without the risk of rust streaking on exposed timber surfaces
• Reduces brittle fracture risk in structural connections - the optimized hardness profile combined with e-coat finish addresses a critical concern in large-diameter structural screws, supporting safe and durable connections in demanding timber framing and connector fastening applications

Specifications

• Brand: Simpson Strong-Tie
• Product Name: Strong-Drive SDCFC TIMBER-CFC Screw
• Length: 11 in.
• Shank Diameter: 0.230 in.
• Head Diameter: 0.400 in.
• Thread Length: 10 5/8 in.
• Head Type: Cylinder Head
• Drive Type: T40 6-Lobe
• Point Type: SawTooth Point
• Coating: E-coat Electrocoating
• Finish: E-coat Electrocoating
• Color: Black