Product Description
Simpson Strong-Drive SDCF TIMBER-CF Screw - 0.315 in. x 7-7/8 in. T40, E-Coat by Simpson Strong-Tie is a heavy-duty structural screw engineered for cross-laminated timber (CLT), mass timber construction, glulam assemblies, and general interior wood-to-wood fastening applications. Featuring a black e-coat electrocoating finish, a SawTooth point for fast starts without predrilling, and a flat head with underhead nibs for clean countersinking, this timber screw delivers the reliable strength and flush finish that demanding structural applications require.
Key Features
- Flat head with underhead nibs - enables clean countersinking so the screw sits flush with the surface for a professional finish in exposed timber and CLT applications
- Heavy-duty, fully-threaded shank - maximizes withdrawal resistance throughout the entire fastener length, providing superior holding power in structural wood connections
- SawTooth point - cuts through wood fibers for a fast, easy start and reduced installation torque, eliminating the need for predrilling in most applications and speeding up the job
- Black e-coat electrocoating finish - provides a durable nonmetallic coating that resists corrosion in interior dry-service environments while enhancing aesthetics in visible timber applications
- Deep T40 6-lobe drive recess - delivers a secure bit-to-fastener connection that reduces cam-out and allows confident, high-torque driving in dense timber
- Optimized hardness profile with e-coat finish - helps mitigate the risk of brittle fracture, supporting long-term structural reliability in mass timber assemblies
- Compliant with CSA O86:24 hydrogen embrittlement requirements - meets current Canadian standard requirements for structural timber screws, making it suitable for code-compliant mass timber projects
Why This Product
- Designed specifically for mass timber and CLT construction - this screw was redesigned by Simpson Strong-Tie to meet the structural demands of cross-laminated timber and heavy timber framing, where uncompromised strength and reliable performance are critical
- No predrilling required in most applications - the SawTooth point reduces installation time and labor cost on large-scale timber projects without sacrificing drive quality or withdrawal strength
- Aesthetics matter in exposed timber - the black e-coat finish blends with dark wood tones common in mass timber interiors, delivering a clean, finished look alongside structural performance
- Versatile across a wide range of structural connections - suitable for wood-to-wood, wood-to-steel, engineered wood multi-ply fastening, beam reinforcement, surface splines, stud-to-plate, and Simpson Strong-Tie connector installations
Specifications
- Brand: Simpson Strong-Tie
- Product Name: Strong-Drive SDCF TIMBER-CF Screw
- Length: 7-7/8 in.
- Shank Diameter: 0.230 in.
- Head Diameter: 0.590 in.
- Thread Length: 7-1/2 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
- SDCF8X200-R50: 50 Pk - includes T40, 6-lobe driver bit (replacement bit: BIT40T-134-R2)
- SDCF8X200: 250 Pk - includes T40, 6-lobe driver bit (replacement bit: BIT40T-134-R2)
Approved Applications
- Mass Timber / Cross-Laminated Timber (CLT)
- Heavy Timber and Timber Framing
- Glulam Beam Fastening
- Fastening Wood-to-Wood
- Fastening Wood-to-Steel
- Engineered Wood - Multi-Ply Fastening
- Fastening Simpson Strong-Tie Connectors
- Fastening Support Beams
- Beam Reinforcement
- Surface Splines
- General Interior Applications
- Fastening Wall-to-Wall
- Fastening Floor-to-Floor
- Fastening Stud-to-Plate
- Fastening Butt Joists
What's Included
- T40, 6-lobe driver bit (replacement bit: BIT40T-134-R2)
Reviews
FAQs
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