Simpson Strong-Drive SDCF TIMBER-CF Screw - 0.470 in. x 11 in., T50, E-Coat by Simpson Strong-Tie is a heavy-duty structural screw engineered for cross-laminated timber (CLT), mass timber construction, and general interior wood-to-wood fastening applications. Redesigned for demanding structural work, this flat-head timber screw delivers uncompromised holding power in heavy timber framing, glulam assemblies, engineered wood multi-ply fastening, and beam reinforcement. The black e-coat electrocoating finish offers a clean, professional appearance alongside reliable corrosion resistance in interior dry-service environments, making it a dependable choice for both large-scale mass timber projects and precision interior structural connections.

Key Features

• Flat head with underhead nibs - enables clean countersinking so the screw sits flush with the wood surface, reducing surface preparation time and delivering a finished look on exposed CLT and mass timber panels
• Heavy-duty, fully-threaded shank (0.315 in. shank diameter, 10 1/4 in. thread length) - maximizes withdrawal resistance along the full embedment depth, giving structural connections the holding strength required for timber framing and engineered wood applications
• SawTooth point - designed for fast starts and reduced installation torque, allowing driving in most applications without predrilling and speeding up production in high-volume mass timber work
• Black e-coat electrocoating finish - provides a construction-durable, nonmetallic coating that resists corrosion in interior dry-service conditions while contributing a uniform black color suited to exposed timber aesthetics
• Deep T50 6-lobe recess - delivers a secure, cam-out-resistant drive connection that maintains control during high-torque installation into dense timber substrates
• 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 a recognized structural standard, giving engineers and inspectors confidence in the fastener's mechanical integrity under load
• 0.875 in. head diameter - provides broad bearing area under the head for improved load transfer and a clean countersunk recess in timber and engineered wood panels

Why This Product

• Purpose-built for CLT and mass timber - the SDCF TIMBER-CF screw is specifically designed for cross-laminated timber, mass timber, and engineered wood multi-ply fastening, making it a structurally appropriate choice where general-purpose fasteners may fall short
• Eliminates predrilling in most applications - the SawTooth point reduces installation torque and starts fast, cutting labor time and tool requirements on large timber construction projects
• Flush, finished appearance without extra work - the flat head with nibs countersinks cleanly on its own, producing a flush surface that meets the aesthetic expectations of exposed mass timber interiors without additional surface work
• Broad application versatility - rated and designed for wood-to-wood, wood-to-steel, stud-to-plate, floor-to-floor, wall-to-wall, surface splines, glulam, timber framing, and Simpson Strong-Tie connector fastening - one screw that covers a wide range of structural details on complex timber builds

Specifications

• Brand: Simpson Strong-Tie
• Product Name: Strong-Drive SDCF TIMBER-CF Screw
• Length: 11 in.
• Shank Diameter: 0.315 in.
• Head Diameter: 0.875 in.
• Thread Length: 10 1/4 in.
• Head Type: Flat Head with Nibs
• Drive Type: T50 6-Lobe
• Point Type: SawTooth Point
• Coating: E-coat Electrocoating
• Finish: E-coat Electrocoating
• Color: Black