Product Description
Simpson Strong-Drive SDCF TIMBER-CF Screw - 0.390 in. x 17 3/4 in., T50, E-Coat by Simpson Strong-Tie is a heavy-duty structural fastener purpose-built for cross-laminated timber (CLT), mass timber construction, engineered wood assemblies, and demanding general interior applications. The fully-threaded, large-diameter shank delivers exceptional withdrawal resistance in wood-to-wood, wood-to-steel, beam reinforcement, and timber framing connections, making it a go-to choice for structural wood fastening where uncompromised holding power and a clean finish are both required.
Key Features
- Flat head with underhead nibs - enables clean countersinking for a flush, professional finish in exposed timber surfaces
- Heavy-duty, fully-threaded shank (0.290 in. shank diameter) - maximizes withdrawal resistance throughout the full length of the fastener, delivering structural-grade holding power in mass timber and engineered wood
- SawTooth point - ensures fast starts and easy driving while reducing installation torque, eliminating the need for predrilling in most applications and speeding up workflow
- Black e-coat electrocoating finish - provides a construction-durable, nonmetallic corrosion-resistant coating suited for interior dry-service applications, while also enhancing the appearance of exposed timber connections
- Deep T50 6-lobe recess - delivers a secure, high-torque drive with reduced cam-out risk, compatible with the included driver bit
- Optimized hardness profile - works in combination with the e-coat finish to help mitigate the risk of brittle fracture for reliable, long-term structural performance
- Compliant with CSA O86:24 hydrogen embrittlement requirements - meets recognized structural standards for mass timber applications, giving engineers and contractors confidence in code-sensitive projects
- 16 3/4 in. thread length - maximizes thread engagement across the full working depth of the connection for superior grip in thick timber members
Why This Product
- Engineered specifically for cross-laminated timber and mass timber construction - the large flat head with nibs seats cleanly without splitting or surface damage, making this screw ideal for CLT panel connections, surface splines, and glulam beam reinforcement where aesthetics and structural integrity both matter
- Eliminates predrilling in most applications - the SawTooth point reduces setup time and labor on heavy timber framing, multi-ply engineered wood fastening, and stud-to-plate connections, keeping large-scale timber projects on schedule
- The black e-coat finish goes beyond corrosion resistance - the optimized hardness profile actively mitigates brittle fracture risk, making this a structurally reliable choice for long-term interior dry-service installations in demanding load-bearing assemblies
- Versatile enough for a wide range of structural connections - from wood-to-wood and wood-to-steel fastening to Simpson Strong-Tie connector attachment, butt joist connections, and wall-to-wall assemblies, this single screw covers many of the most common structural timber fastening scenarios
Specifications
- Brand: Simpson Strong-Tie
- Product Name: Strong-Drive SDCF TIMBER-CF Screw
- Length: 17 3/4 in.
- Shank Diameter: 0.290 in.
- Head Diameter: 0.725 in.
- Thread Length: 16 3/4 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
Available Pack Options
- SDCF10X450-R25: 25 Pk - includes T50, 6-lobe driver bit (replacement bit: BIT50T-2-R1)
- SDCF10X450: 100 Pk - includes T50, 6-lobe driver bit (replacement bit: BIT50T-2-R1)
Approved Applications
- Fastening Wood-to-Wood
- General Interior
- Fastening Support Beams
- Heavy Timber
- Mass Timber / Cross-Laminated Timber
- Engineered Wood - Multi-Ply Fastening
- Fastening Simpson Strong-Tie Connectors
- Engineered Wood
- Fastening Wood-to-Steel
- Timber Framing
- Surface Splines
- Beam Reinforcement
- Fastening Wall-to-Wall
- Glulam
- Fastening Butt Joists
- Fastening Floor-to-Floor
- Fastening Stud-to-Plate
What's Included
- T50, 6-lobe driver bit (replacement bit: BIT50T-2-R1)
Reviews
FAQs
Standard Shipping is free on most orders over $50 within the contiguous US. If the order is under $50.00, the shipping is $9.99 set fee for shipping within the contiguous US.
Most of our products will ship within 1 to 3 Business Days. Some Special order products will ship within 2 to 5 Business Days. Preorders will be shipped to you on a first come first serve basis as soon as available from the manufacturer. Items that are "Made-to-Order" (Custom order products) will be shipped when fabrication is completed, shipping and delivery times will vary and depend on manufacturing.
Products that are shipped directly from the manufacturer will have processing and fulfilment times subject to manufacturer availability.
Preorders are shipped on a first come first serve basis as soon as available from the manufacturer, the sooner you place your Preorder the sooner your order will ship.
Freight shipping Policy:
Orders/Items too large or heavy may require special handling/Shipping and may require to be sent by truck. Someone must be present to accept truck deliveries. Standard truck delivery is to a dock facility designed to receive freight. You will be notified within 24 hours of ordering to confirm delivery. Lift gates for deliveries are available for an additional fee.
We offer Financing options through Clicklease
Please email your Return request to info@FactoryDirectSupplyOnline.com
Include the order number and the reason for your return.
All returns, regardless of their categorization, must include all original parts, be in their original packaging, and in the condition in which they were received. You may not qualify to receive a refund If the returned item is used, damaged, missing any parts, or is damaged during return shipping.
Checkout our complete Return policy
You can contact us through our contact page! We will be happy to assist you.