Simpson Strong-Drive SDCFC TIMBER-CFC Screw - 0.315 in. x 15 in., T40, E-Coat by Simpson Strong-Tie is a heavy-duty structural wood screw engineered for demanding large-member applications including mass timber, glulam, and heavy timber framing. The redesigned TIMBER-CFC screw combines a fully threaded shank for superior withdrawal resistance with a compact cylinder head that delivers a clean exposed finish or a concealed look when countersunk - making it a versatile choice for timber framing, beam reinforcement, engineered wood fastening, and cross-laminated timber construction. The black e-coat electrocoating provides corrosion resistance in interior dry-service applications while giving the fastener a refined, professional appearance.

Key Features

• Compact cylinder head design - helps countersink the screw flush for a clean finish whether left exposed or concealed, ideal for visible structural connections in mass timber and glulam applications
• Heavy-duty, fully-threaded shank - the 14 5/8 in. thread length running nearly the full 15 in. length maximizes withdrawal resistance in large structural members such as engineered wood and heavy timber
• SawTooth point - enables fast starts and easy driving, reducing installation torque and eliminating the need for predrilling in most applications so work moves faster on the jobsite
• Black e-coat electrocoating finish - provides a construction-durable nonmetallic coating for corrosion resistance in interior dry-service conditions while maintaining a clean, professional aesthetic
• Deep T40 6-lobe drive recess - delivers a secure, slip-resistant engagement with the driver bit, reducing cam-out and improving torque transfer when driving large structural screws
• Optimized hardness profile - works together with the e-coat finish to help mitigate the risk of brittle fracture, supporting reliable, long-term structural performance
• Compliant with CSA O86:24 hydrogen embrittlement requirements - meets recognized structural standards for timber screw applications, giving engineers and builders confidence in code-relevant installations
• 0.315 in. nominal diameter with 0.230 in. shank diameter - sized for large structural members where high load capacity and deep penetration are critical to connection integrity

Why This Product

• Designed specifically for large-member structural applications - including mass timber, cross-laminated timber, glulam, and multi-ply engineered wood fastening - this screw addresses the unique demands of heavy timber construction where standard wood screws fall short in both length and withdrawal strength.
• The SawTooth point eliminates predrilling in most applications, reducing labor and tool requirements on the jobsite without sacrificing installation quality or connection performance.
• The black e-coat electrocoating is a nonmetallic, construction-durable finish specifically suited for interior dry-service environments, offering an aesthetic advantage over plain steel finishes while providing meaningful corrosion resistance throughout the fastener's service life.
• CSA O86:24 compliance for hydrogen embrittlement requirements means this fastener meets a recognized structural standard, making it a supportable choice for engineered and architect-specified timber connections.

Specifications

• Brand: Simpson Strong-Tie
• Product Name: Strong-Drive SDCFC TIMBER-CFC Screw
• Length: 15 in.
• Nominal Diameter: 0.315 in.
• Shank Diameter: 0.230 in.
• Head Diameter: 0.400 in.
• Thread Length: 14 5/8 in.
• Head Type: Cylinder Head
• Drive Type: T40 6-Lobe
• Point Type: SawTooth Point
• Coating: E-coat Electrocoating
• Finish: E-coat Electrocoating
• Color: Black