Simpson Strong-Drive SDCFC TIMBER-CFC Screw - 0.390 in. x 11-3/4 in., T50, E-Coat by Simpson Strong-Tie is a heavy-duty structural fastener engineered for demanding timber framing, mass timber, and engineered wood applications. With a fully threaded shank, a compact cylinder head, and a SawTooth point for fast, clean starts, this screw delivers exceptional withdrawal resistance and a professional finish in large-member wood construction. The black e-coat electrocoating finish provides corrosion resistance suited to interior dry-service environments while giving the fastener a clean, finished appearance whether left exposed or countersunk.

Key Features

• Compact cylinder head design - helps countersink the screw flush for a clean, professional finish when exposed or fully concealed when recessed into the workpiece
• Heavy-duty, fully-threaded shank - maximizes withdrawal resistance along the entire fastener length, providing exceptional holding strength in large structural members
• SawTooth point - enables fast starts and easy driving while reducing installation torque, eliminating the need for predrilling in most applications and saving significant labor time
• Black e-coat electrocoating finish - delivers a construction-durable nonmetallic coating with corrosion resistance for interior dry-service applications while maintaining a clean aesthetic appearance
• Deep T50 6-lobe recess - provides a secure, positive engagement with the driver bit to reduce cam-out and improve installation control in heavy timber work
• Compliant with CSA O86:24 hydrogen embrittlement requirements - meets recognized structural standards and helps mitigate the risk of brittle fracture for reliable long-term performance
• Optimized hardness profile - works together with the e-coat finish to reduce brittleness risk, supporting consistent structural performance over the life of the installation
• 0.390 in. overall diameter x 11-3/4 in. length with an 11-3/8 in. thread length - sized for through-fastening and deep penetration in heavy timber, glulam, and cross-laminated timber assemblies

Why This Product

• Built specifically for mass timber and large structural members - the fully threaded shank and 11-3/4 in. length make this screw well suited for glulam, cross-laminated timber, multi-ply engineered wood, and heavy timber framing where deep penetration and high withdrawal resistance are required
• Eliminates predrilling in most applications - the SawTooth point reduces installation torque and starts fast, cutting installation time on large-scale timber projects without sacrificing structural integrity
• Designed for compliance and long-term reliability - CSA O86:24 hydrogen embrittlement compliance combined with an optimized hardness profile addresses brittle fracture concerns that can arise with high-strength structural screws, giving builders and engineers confidence in the fastener's durability
• Versatile for a wide range of structural connections - approved for wood-to-wood fastening, beam reinforcement, wall-to-wall connections, butt joist fastening, and attachment of Simpson Strong-Tie connectors, making it a flexible choice across a single job site

Specifications

• Brand: Simpson Strong-Tie
• Product Name: Strong-Drive SDCFC TIMBER-CFC Screw
• Length: 11-3/4 in.
• Thread Length: 11-3/8 in.
• Shank Diameter: 0.290 in.
• Head Diameter: 0.528 in.
• Head Type: Cylinder Head
• Drive Type: T50 6-Lobe
• Point Type: SawTooth Point
• Coating: E-coat Electrocoating
• Finish: E-coat Electrocoating
• Color: Black