Simpson Strong-Drive SDCF TIMBER-CF Screw - 0.390 in. x 9-1/2 in., T50, E-Coat by Simpson Strong-Tie is a heavy-duty structural fastener engineered for cross-laminated timber (CLT), mass timber construction, and general interior wood-to-wood applications. Designed for demanding timber framing and engineered wood projects, this fully-threaded screw delivers uncompromised withdrawal resistance and a clean, flush finish - making it the right choice for professionals working with glulam, multi-ply fastening, beam reinforcement, and surface splines. The black e-coat electrocoating finish gives it a refined appearance while providing a construction-durable nonmetallic coating suited to interior dry-service conditions.

Key Features

• Flat head with underhead nibs - enables clean countersinking so the screw sits flush with the wood surface, eliminating the need for additional finishing work on exposed CLT and mass timber panels.
• Heavy-duty, fully-threaded shank (0.290 in. shank diameter) - maximizes withdrawal resistance along the full 9 in. thread length, delivering structural performance in load-bearing timber connections.
• SawTooth point - provides a fast start and easy driving, reducing installation torque and eliminating the need for predrilling in most applications, saving time on the job.
• Black e-coat electrocoating finish - a construction-durable nonmetallic coating that provides corrosion resistance in interior dry-service applications while maintaining a clean, consistent black appearance.
• Deep T50 6-lobe recess - creates a secure, positive engagement with the driver bit, reducing cam-out and providing reliable torque transfer even in heavy timber applications.
• Compliant with CSA O86:24 hydrogen embrittlement requirements - the optimized hardness profile and e-coat finish help mitigate the risk of brittle fracture, supporting long-term structural reliability.
• 0.390 in. head diameter / 0.725 in. overall head width - a generously sized flat head distributes load across the wood surface, reducing splitting risk in CLT and engineered wood panels.
• 9-1/2 in. overall length (240 mm) - sized for deep penetration into mass timber and multi-ply engineered wood assemblies where a long fastener is required for code-compliant connections.

Why This Product

• Purpose-built for mass timber and CLT construction - the SDCF TIMBER-CF screw is specifically designed for cross-laminated timber, glulam, and heavy timber applications, addressing the unique fastening demands of modern mass timber building systems where structural integrity and a flush finish both matter.
• No predrilling required in most applications - the SawTooth point reduces installation torque and allows direct driving into dense engineered wood and timber, saving significant time and labor on large-scale CLT and glulam projects.
• Reliable long-term performance supported by CSA compliance - the screw's optimized hardness profile and e-coat finish are engineered to meet CSA O86:24 hydrogen embrittlement requirements, reducing brittle fracture risk and supporting confidence in structural wood connections over time.
• Versatile across a wide range of interior structural applications - approved for wood-to-wood, wood-to-steel, wall-to-wall, floor-to-floor, stud-to-plate, and Simpson Strong-Tie connector fastening, this single screw covers a broad scope of interior structural framing and engineered wood assembly tasks.

Specifications

• Brand: Simpson Strong-Tie
• Product Name: Strong-Drive SDCF TIMBER-CF Screw
• Length: 9-1/2 in. (240 mm)
• Shank Diameter: 0.290 in.
• Head Diameter: 0.725 in.
• Thread Length: 9 in.
• Drive Type: T50 6-Lobe
• Head Type: Flat Head with Nibs
• Point Type: SawTooth Point
• Coating: E-coat Electrocoating
• Finish: E-coat Electrocoating
• Color: Black