Product Description
Simpson Strong-Drive SDCF TIMBER-CF Screw - 0.470 in. x 23 5/8 in., T50 6-Lobe, E-Coat, 50-Pack by Simpson Strong-Tie is a heavy-duty structural screw engineered specifically for cross-laminated timber (CLT), mass timber construction, and general interior wood applications. At nearly 24 inches in length with a fully threaded shank, this timber fastener delivers exceptional withdrawal resistance and holding power in demanding wood-to-wood, wood-to-steel, and engineered lumber connections. The black e-coat electrocoating finish and optimized hardness profile make it a reliable long-term solution for interior dry-service framing, glulam beam reinforcement, timber framing, and multi-ply engineered wood fastening.
Key Features
- Flat head with underhead nibs - countersinks cleanly into the wood surface for a flush, professional finish without additional surface prep
- Heavy-duty, fully-threaded shank - maximizes contact with wood fibers along the full 22 5/8 in. thread length, delivering superb withdrawal resistance in structural applications
- SawTooth point - cuts through wood fibers for a fast start and easy driving, eliminating the need for predrilling in most applications and reducing installation torque
- Black e-coat electrocoating finish - provides a construction-durable, nonmetallic coating for corrosion resistance in interior dry-service environments while enhancing the appearance of exposed timber connections
- Deep T50 6-lobe recess - maximizes driver engagement for a secure, slip-resistant drive that reduces cam-out even under high torque
- Compliant with CSA O86:24 hydrogen embrittlement requirements - the optimized hardness profile helps mitigate the risk of brittle fracture, supporting reliable long-term structural performance
- 0.470 in. head diameter of 0.875 in. - the large flat head distributes load effectively at the bearing surface, enhancing pull-through resistance in mass timber panels and structural members
- 50-pack box - packaged in quantities suited for project-scale structural fastening work, reducing handling time on the job
Why This Product
- Designed from the ground up for cross-laminated timber and mass timber construction - the long 23 5/8 in. length and fully threaded 22 5/8 in. shank address the specific fastening demands of thick CLT panels, glulam beams, and multi-ply engineered wood assemblies where shorter screws simply cannot reach or hold
- Eliminates predrilling in most applications thanks to the SawTooth point, saving significant time during large timber framing, beam reinforcement, and surface spline installation projects
- The black e-coat electrocoating is both functional and aesthetic - it provides corrosion resistance for interior dry-service use while blending with exposed dark timber surfaces common in modern mass timber architecture
- CSA O86:24 hydrogen embrittlement compliance and the mitigated brittle fracture risk mean this screw meets the reliability standards required for structural connections in mass timber buildings, giving installers confidence in the long-term integrity of each fastened joint
Specifications
- Brand: Simpson Strong-Tie
- Model Number: SDCF12X600
- Product Name: Strong-Drive SDCF TIMBER-CF Screw
- Length: 23 5/8 in.
- Shank Diameter: 0.315 in.
- Head Diameter: 0.875 in.
- Thread Length: 22 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
Approved Applications
- Fastening Wood-to-Wood
- General Interior
- Fastening Support Beams
- Heavy Timber
- Mass Timber / Cross-Laminated Timber
- Engineered Wood - Multi-Ply Fastening
- Fastening Simpson Strong-Tie Connectors
- Engineered Wood
- Fastening Wood-to-Steel
- Timber Framing
- Surface Splines
- Beam Reinforcement
- Fastening Wall-to-Wall
- Glulam
- Fastening Butt Joists
- Fastening Floor-to-Floor
- Fastening Stud-to-Plate
What's Included
- T50, 6-lobe driver bit (replacement bit: BIT50T-2-R1)
Reviews
FAQs
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