The Simpson Strong-Drive SDCFC TIMBER-CFC Screw - 0.390 in. x 19 5/8 in., T50, E-Coat by Simpson Strong-Tie is a heavy-duty structural wood screw engineered for demanding timber framing, mass timber, and engineered wood applications. With a fully threaded shank measuring 18 3/4 in. of thread length, a SawTooth point for fast, clean starts, and a black e-coat electrocoating finish, this screw delivers both installation efficiency and long-term corrosion resistance in interior dry-service environments. Whether you are fastening glulam beams, reinforcing structural members, or connecting cross-laminated timber panels, this robust cylinder-head screw provides the holding power and clean aesthetics professionals demand. Each box contains 50 screws plus a T50 6-lobe driver bit.

Key Features

• Compact cylinder head - helps countersink the screw for a clean finish whether left exposed or fully recessed, ideal for visible timber applications
• Heavy-duty, fully threaded shank (18 3/4 in. thread length) - provides exceptional withdrawal resistance across the full length of the fastener for superior structural holding power in large timber members
• SawTooth point - enables fast starts and easy driving, reducing installation torque and eliminating the need for predrilling in most applications to save time on the job site
• Black e-coat electrocoating finish - delivers a construction-durable nonmetallic coating for corrosion resistance in interior dry-service applications, while the black color enhances aesthetics on exposed timber
• Deep T50 6-lobe recess - provides a secure, slip-resistant drive connection that reduces cam-out and driver wear during installation of long structural screws
• Optimized hardness profile - helps mitigate the risk of brittle fracture for reliable, long-term structural performance in heavy timber and mass timber assemblies
• Compliant with CSA O86:24 hydrogen embrittlement requirements - meets current Canadian structural wood design standards, supporting code-compliant timber construction projects
• 0.390 in. overall diameter with a 0.290 in. shank diameter - sized for structural applications in large members such as mass timber, glulam, and engineered wood multi-ply assemblies

Why This Product

• Engineered specifically for large timber members - at 19 5/8 in. in length with an 18 3/4 in. thread length, this screw is purpose-built for thick structural assemblies including mass timber, cross-laminated timber, and multi-ply engineered wood where shorter fasteners simply cannot provide adequate penetration or withdrawal resistance.
• No predrilling required in most applications - the SawTooth point significantly reduces installation torque and eliminates a time-consuming prep step on most timber framing jobs, improving productivity without sacrificing connection strength.
• Clean finish on exposed timber work - the compact cylinder head is designed to countersink flush or slightly below the surface, leaving a professional, unobtrusive appearance on visible beam and timber faces where aesthetics matter alongside structural performance.
• Black e-coat finish addresses both durability and aesthetics - the nonmetallic electrocoating provides corrosion resistance for interior dry-service use while the black color complements natural and engineered wood surfaces commonly found in contemporary heavy timber architecture.

Specifications

• Brand: Simpson Strong-Tie
• Model Number: SDCFC10X500
• Length: 19 5/8 in.
• Shank Diameter: 0.290 in.
• Head Diameter: 0.528 in.
• Thread Length: 18 3/4 in.
• Drive Type: T50 6-Lobe
• Head Type: Cylinder Head
• Point Type: SawTooth Point
• Coating: E-coat Electrocoating
• Finish: E-coat Electrocoating
• Color: Black