Simpson Strong-Drive SDCFC TIMBER-CFC Screw - 0.315 in. x 17 in., T40, E-Coat by Simpson Strong-Tie is a heavy-duty structural wood screw engineered for demanding applications involving large timber members, engineered wood assemblies, and mass timber construction. With a fully threaded shank for maximum withdrawal resistance, a compact cylinder head for a clean exposed or countersunk finish, and a black e-coat electrocoating finish that resists corrosion in interior dry-service environments, this screw delivers reliable long-term performance in timber framing, glulam fastening, beam reinforcement, and cross-laminated timber work. The redesigned SawTooth point enables fast starts and easy driving, eliminating the need for predrilling in most applications and reducing installation torque for faster, more efficient jobsite performance.

Key Features

• Compact cylinder head - helps countersink the screw flush for a clean, professional finish whether left exposed or concealed, ideal for visible structural connections
• Fully threaded shank - provides heavy-duty strength and superb withdrawal resistance along the full 17 in. length, maximizing holding power in large timber members
• SawTooth point - enables fast starts and easy driving with reduced installation torque, so predrilling is not required in most applications, saving time on the job
• Black e-coat electrocoating finish - delivers a construction-durable nonmetallic coating for corrosion resistance in interior dry-service applications, while the optimized hardness profile helps mitigate the risk of brittle fracture for long-term reliability
• Deep T40 6-lobe recess - provides a secure, positive drive engagement that reduces cam-out and gives the installer confident control when driving long structural screws
• Compliant with CSA O86:24 hydrogen embrittlement requirements - meets established safety and performance standards for structural wood screw applications
• 0.315 in. nominal diameter with 0.230 in. shank diameter - engineered proportions for structural integrity while maintaining driveability in heavy timber and engineered wood
• 16 in. thread length - nearly the full length of the screw is threaded, maximizing engagement and withdrawal resistance in thick, multi-ply, or laminated assemblies

Why This Product

• Designed specifically for large structural members - this screw's 17 in. length and fully threaded shank make it the right fastener for mass timber, glulam, heavy timber framing, and multi-ply engineered wood assemblies where standard screws fall short
• No predrilling required in most applications - the SawTooth point dramatically reduces installation time and labor on large timber projects, making it practical for both small crews and high-volume structural work
• Aesthetic and structural in one fastener - the compact cylinder head allows the screw to sit flush or countersink cleanly, making it suitable for exposed structural connections where appearance matters alongside performance
• Engineered for long-term reliability - the optimized hardness profile combined with the e-coat finish addresses the risk of brittle fracture and corrosion in interior dry-service conditions, supporting durable connections in engineered wood, beams, and Simpson Strong-Tie connector installations

Specifications

• Brand: Simpson Strong-Tie
• Product Name: Strong-Drive SDCFC TIMBER-CFC Screw
• Length: 17 in.
• Shank Diameter: 0.230 in.
• Head Diameter: 0.400 in.
• Thread Length: 16 in.
• Drive Type: T40 6-Lobe
• Head Type: Cylinder Head
• Point Type: SawTooth Point
• Coating: E-coat Electrocoating
• Finish: E-coat Electrocoating
• Color: Black