Simpson Strong-Drive SDCP TIMBER-CP Screw - 8 mm x 300 mm, Black 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 framing applications. The black e-coat electrocoating finish delivers a low-friction, corrosion-resistant surface that reduces driving torque while meeting the demands of fire-retardant treated (FRT) lumber environments. Partially threaded for superior pull-together force, this structural wood screw is built to draw framing members tightly together with outstanding holding power - making it a trusted choice for timber framing, post frame construction, engineered wood assemblies, and factory-built or modular construction projects.

Key Features

• Black e-coat electrocoating finish - provides a construction-durable, nonmetallic, friction-reducing coating approved for FRT lumber and corrosion resistance (approved for ICC-ES AC257 Exposure Condition 3), so you can drive into treated wood without accelerated corrosion concerns
• Optimized hardness profile compliant with CSA O86:24 - mitigates external hydrogen embrittlement, reducing the risk of brittle fracture in structural applications where long-term reliability is critical
• Flat head with underhead nibs - countersinks cleanly for a flush, finished surface without additional prep work, saving installation time
• Deep T40, 6-lobe drive recess - delivers a secure, cam-out-resistant drive for confident installation; a T40 driver bit is included in the package
• Heavy-duty shank with shank knurl - adds strength and durability while reducing torque during driving, making long fasteners easier to install
• Type-17 point - ensures fast starts, reduces installation torque, and eliminates the need for predrilling in most applications, speeding up the workflow on the job site
• 300 mm (11 3/4 in.) length - sized for deep penetration in thick mass timber and multi-ply engineered wood assemblies, providing the grip depth needed for structural connections
• Partially threaded design - pulls structural members tightly together for superb clamping and load-carrying capacity in wood-to-wood connections
• Interior and dry-service rated - optimized for interior construction environments including CLT, structural composite lumber, and engineered wood systems

Why This Product

• Designed specifically for mass timber and CLT construction - the 300 mm length and partial thread profile are engineered to handle the deep penetration and clamping force demands of thick engineered wood and cross-laminated timber assemblies, where standard screws fall short.
• The black e-coat finish reduces driving friction - meaning less torque is required to seat each fastener, reducing installer fatigue and bit wear during large-scale timber framing or post frame projects.
• CSA O86:24 hydrogen embrittlement compliance provides peace of mind - the optimized hardness profile is specifically developed to mitigate brittle fracture risk, a critical consideration in structural wood connections subject to long-term loading.
• No predrilling required in most applications - the Type-17 point and low-friction coating work together to simplify installation in engineered wood, structural composite lumber, and general framing scenarios, reducing labor time and tool requirements on site.

Specifications

• Brand: Simpson Strong-Tie
• Product Name: Strong-Drive SDCP TIMBER-CP Screw
• Diameter: 8 mm
• Length: 300 mm (11 3/4 in.)
• Shank Diameter: 0.225 in.
• Thread Length: 3 1/8 in.
• Head Diameter: 0.575 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