Simpson Strong-Drive SDCP TIMBER-CP Screw - 8 mm x 160 mm, Black E-Coat by Simpson Strong-Tie is a high-performance structural fastener engineered for cross-laminated timber (CLT), mass timber construction, and general interior wood framing applications. This partially threaded screw delivers exceptional holding power and load capacity, pulling structural members tightly together for reliable connections in engineered wood, timber framing, post frame, and modular construction. The black e-coat electrocoating finish reduces drive friction and provides corrosion resistance suited to interior and dry-service conditions, making this screw a go-to choice for professionals working with structural composite lumber, multi-ply engineered wood assemblies, and wood-to-wood fastening across residential and commercial framing projects.

Key Features

• Black e-coat electrocoating finish - provides a construction-durable, nonmetallic, friction-reducing coating approved for ICC-ES AC257 Exposure Condition 3, enabling use with fire-retardant-treated (FRT) lumber and adding corrosion resistance without the added torque of heavier coatings
• Optimized hardness profile compliant with CSA O86:24 - mitigates external hydrogen embrittlement risk, so these structural fasteners maintain toughness and integrity in demanding mass timber and CLT applications
• Flat head with underhead nibs - allows the head to countersink cleanly and sit flush with the wood surface, producing a professional finish without additional work
• Deep T40, 6-lobe recess drive - provides a secure, cam-out-resistant engagement between driver and fastener, reducing slippage and installer fatigue during high-volume installations
• Heavy-duty shank - delivers the structural strength and durability required for load-bearing timber connections
• Shank knurl - reduces installation torque, making driving smoother and easier in dense engineered wood materials
• Type-17 point - cuts into wood fibers quickly for fast starts, lowers installation torque, and eliminates the need for predrilling in most applications, saving time on the job
• Partial thread design - pulls structural members tightly together with superb holding power and excellent load capacity for secure, long-lasting connections
• Drive bit included - the T40, 6-lobe driver bit is included in the box, so installation can begin immediately without sourcing a separate bit

Why This Product

• Purpose-built for mass timber and CLT construction - this screw is specifically designed for cross-laminated timber, engineered wood, and structural composite lumber, addressing the unique demands of modern mass timber framing where standard fasteners may fall short
• Reduces installation effort without sacrificing structural performance - the combination of a low-friction e-coat finish, shank knurl, and Type-17 point means less torque is needed to drive each fastener, reducing tool wear and installer fatigue on large-scale framing projects
• Addresses hydrogen embrittlement concerns - the optimized hardness profile meets CSA O86:24 requirements, giving engineers and builders confidence that the fastener will resist brittle fracture over time in structural applications
• Interior and dry-service rated with FRT lumber compatibility - the e-coat finish is approved for ICC-ES AC257 Exposure Condition 3, making this screw a verified choice for interior framing that includes factory-built, modular, or post-frame construction where FRT lumber is common

Specifications

• Brand: Simpson Strong-Tie
• Product Name: Strong-Drive SDCP TIMBER-CP Screw
• Diameter: 8 mm
• Length: 160 mm (6 1/4 in.)
• Shank Diameter: 0.225 in.
• Head Diameter: 0.575 in.
• Thread Length: 3 1/8 in.
• Head Type: Flat Head with Nibs
• Drive Type: T40 6-Lobe
• Point Type: Type-17 Point
• Coating: E-coat Electrocoating
• Finish: E-coat Electrocoating
• Color: Black