Simpson Strong-Drive SDCF TIMBER-CF Screw - 0.470 in. x 9-1/2 in., T50, E-Coat by Simpson Strong-Tie is a heavy-duty structural wood screw engineered for cross-laminated timber (CLT), mass timber construction, and demanding general interior applications. The redesigned SDCF screw delivers uncompromised holding power in heavy timber, glulam, and engineered wood assemblies, combining a fully-threaded shank for superior withdrawal resistance with a SawTooth point that starts fast and drives cleanly - eliminating the need for predrilling in most applications. The black e-coat electrocoating finish not only provides a clean, professional look in exposed timber framing but also offers corrosion resistance suited to interior dry-service environments, while the optimized hardness profile helps mitigate the risk of brittle fracture for reliable, long-term structural performance.

Key Features

• Flat head with underhead nibs - enables clean countersinking so the screw sits flush with the timber surface, delivering a finished appearance in exposed mass timber and CLT applications.
• Heavy-duty, fully-threaded shank - maximizes thread engagement along the full 8 5/8 in. thread length, providing superb withdrawal resistance for demanding structural connections in heavy timber and multi-ply engineered wood.
• SawTooth point for fast start and easy driving - reduces installation torque and eliminates predrilling in most applications, saving time on large timber framing and CLT projects.
• Black e-coat electrocoating finish - provides a construction-durable nonmetallic coating for corrosion resistance in interior dry-service applications, while enhancing aesthetics in exposed timber construction.
• Deep T50 6-lobe drive recess - gives a secure, slip-resistant engagement with the driver bit, reducing cam-out during high-torque driving into dense timber and glulam.
• Optimized hardness profile - helps mitigate the risk of brittle fracture, supporting reliable, long-term structural performance in cross-laminated timber and mass timber assemblies.
• Compliant with CSA O86:24 hydrogen embrittlement requirements - meets current Canadian wood design standards, confirming suitability for structural mass timber applications requiring code compliance.
• 0.470 in. head diameter of 0.875 in. - the wide flat head distributes load effectively across the timber surface, reducing the risk of pull-through in wood-to-wood and wood-to-steel connections.

Why This Product

• Purpose-built for mass timber and CLT construction - the SDCF screw is specifically designed for cross-laminated timber, glulam, and heavy timber applications where standard screws lack the withdrawal strength and structural integrity required by modern mass timber design.
• No predrilling required in most applications - the SawTooth point reduces installation torque and starts fast in dense timber, cutting labor time significantly on large-scale timber framing, beam reinforcement, and surface spline connections.
• Flush, finished appearance in exposed timber - the flat head with underhead nibs countersinks cleanly, making this screw a practical choice for visible CLT panels, glulam beams, and architectural timber framing where aesthetics matter alongside structural performance.
• Corrosion-resistant coating with structural-grade hardness - the black e-coat electrocoating provides corrosion resistance for interior dry-service use, while the optimized hardness profile reduces brittle fracture risk - a critical consideration in structural timber connections where fastener failure consequences are severe.

Specifications

• Brand: Simpson Strong-Tie
• Product Name: Strong-Drive SDCF TIMBER-CF Screw
• Length: 9 1/2 in.
• Shank Diameter: 0.315 in.
• Head Diameter: 0.875 in.
• Thread Length: 8 5/8 in.
• Head Type: Flat Head with Nibs
• Drive Type: T50 6-Lobe
• Point Type: SawTooth Point
• Coating: E-coat Electrocoating
• Finish: E-coat Electrocoating
• Color: Black