Product Description
Simpson Strong-Drive SDCF TIMBER-CF Screw - 0.315 in. x 6-1/4 in., T40, E-Coat by Simpson Strong-Tie is a heavy-duty structural screw engineered for cross-laminated timber (CLT), mass timber construction, and general interior wood-to-wood fastening applications. The redesigned SDCF TIMBER-CF delivers uncompromised holding strength in demanding structural assemblies - from glulam beams and engineered wood panels to timber framing and beam reinforcement. Its black e-coat electrocoating provides a construction-durable, nonmetallic finish suited for interior dry-service conditions, while the fully-threaded shank and SawTooth point work together for fast, clean installation without predrilling in most applications.
Key Features
- Flat head with underhead nibs - enables clean countersinking so the screw sits flush with the wood surface, producing a finished appearance without additional work
- Fully-threaded shank with 0.230 in. shank diameter - maximizes withdrawal resistance along the full fastener length, delivering structural-grade holding power in heavy timber and multi-ply engineered wood
- SawTooth point for fast starts and easy driving - reduces installation torque and eliminates the need for predrilling in most applications, saving time and effort on the job
- Black e-coat electrocoating finish - provides a corrosion-resistant, nonmetallic coating suited for interior dry-service environments, while also enhancing the overall appearance of exposed fasteners in finished mass timber assemblies
- Deep T40 6-lobe drive recess - provides a secure bit engagement that reduces cam-out and allows for confident, high-torque driving in dense timber
- Optimized hardness profile compliant with CSA O86:24 hydrogen embrittlement requirements - mitigates the risk of brittle fracture for reliable, long-term structural performance in mass timber applications
- 6-1/4 in. length with 5-7/8 in. thread length - provides deep thread engagement for superior pull-through resistance in thick timber members and multi-ply fastening scenarios
Why This Product
- Purpose-built for mass timber and CLT construction - the SDCF TIMBER-CF is specifically designed for cross-laminated timber and heavy timber assemblies where structural integrity and long-term performance are non-negotiable, making it the right choice for modern mass timber projects
- No predrilling required in most applications - the SawTooth point reduces installation torque and eliminates an extra step in most fastening situations, helping crews work faster in structural glulam, engineered wood, and timber framing applications
- Flush finish without extra finishing work - the flat head with underhead nibs countersinks cleanly into the wood surface, which matters in exposed CLT ceilings, finished beam applications, and aesthetically conscious mass timber interiors
- Engineered to resist brittle fracture - the optimized hardness profile and e-coat finish together help reduce the risk of fastener failure over time, giving structural designers and builders added confidence in long-term performance
Specifications
- Brand: Simpson Strong-Tie
- Product Name: Strong-Drive SDCF TIMBER-CF Screw
- Length: 6-1/4 in.
- Shank Diameter: 0.230 in.
- Head Diameter: 0.590 in.
- Thread Length: 5-7/8 in.
- Head Type: Flat Head with Nibs
- Drive Type: T40 6-Lobe
- Point Type: SawTooth Point
- Coating: E-coat Electrocoating
- Finish: E-coat Electrocoating
- Color: Black
Available Pack Options
- SDCF8X160-R50: 50 Pk - includes T40, 6-lobe driver bit (replacement bit: BIT40T-134-R2)
- SDCF8X160: 250 Pk - includes T40, 6-lobe driver bit (replacement bit: BIT40T-134-R2)
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
- T40, 6-lobe driver bit (replacement bit: BIT40T-134-R2)
Reviews
FAQs
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Most of our products will ship within 1 to 3 Business Days. Some Special order products will ship within 2 to 5 Business Days. Preorders will be shipped to you on a first come first serve basis as soon as available from the manufacturer. Items that are "Made-to-Order" (Custom order products) will be shipped when fabrication is completed, shipping and delivery times will vary and depend on manufacturing.
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