Simpson Strong-Drive SDCF TIMBER-CF Screw - 0.315 in. x 13-3/4 in., T40, E-Coat by Simpson Strong-Tie is a heavy-duty structural fastener engineered for cross-laminated timber (CLT), mass timber construction, and general interior wood-to-wood applications. Redesigned for demanding structural connections, this fully-threaded timber screw combines a SawTooth point for fast, low-torque installation with a flat head featuring underhead nibs that countersink cleanly for a flush finish. The black e-coat electrocoating provides corrosion resistance in interior dry-service environments, making it a reliable choice for engineered wood assemblies, glulam beams, timber framing, and multi-ply fastening applications where long-term structural integrity is essential.

Key Features

• Flat Head with Underhead Nibs - enables clean countersinking into wood surfaces for a flush, professional finish without additional prep work
• Heavy-Duty, Fully-Threaded Shank - the 0.230 in. shank diameter running full thread length delivers superior withdrawal resistance and consistent structural strength across the entire connection
• SawTooth Point - engineered for fast starts and reduced installation torque, eliminating the need for predrilling in most applications and speeding up large-scale timber projects
• Black E-Coat Electrocoating Finish - a construction-durable, nonmetallic coating that provides corrosion resistance in interior dry-service applications while enhancing overall aesthetics
• Deep T40 6-Lobe Drive Recess - provides a secure, high-torque drive connection that reduces bit slippage and cam-out during installation
• Optimized Hardness Profile - works in combination with the e-coat finish to help mitigate the risk of brittle fracture, contributing to reliable long-term performance in structural applications
• CSA O86:24 Compliant - meets hydrogen embrittlement requirements, giving builders confidence in code-compliant mass timber and CLT construction
• 13-3/4 in. (350 mm) Length - provides deep fastening penetration suited for heavy timber, beam reinforcement, and multi-ply engineered wood assemblies

Why This Product

• Designed specifically for mass timber and CLT - the SDCF TIMBER-CF screw is purpose-built for cross-laminated timber and mass timber construction, addressing the unique fastening demands of these high-load structural systems where standard screws are not appropriate
• No predrilling required in most applications - the SawTooth point reduces installation torque significantly, saving time and labor on large timber framing and multi-ply fastening projects without compromising connection quality
• Versatile across a wide range of structural connections - approved for wood-to-wood, wood-to-steel, beam reinforcement, surface splines, glulam, stud-to-plate, wall-to-wall, floor-to-floor, and Simpson Strong-Tie connector fastening, making it a single-screw solution across many interior structural tasks
• Brittle fracture risk mitigation built in - the combination of optimized hardness profile and e-coat finish directly addresses a critical concern in structural timber fastening, reducing the likelihood of sudden fastener failure over time

Specifications

• Brand: Simpson Strong-Tie
• Product Name: Strong-Drive SDCF TIMBER-CF Screw
• Length: 13-3/4 in. (350 mm)
• Shank Diameter: 0.230 in.
• Head Diameter: 0.590 in.
• Thread Length: 13-3/4 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