The Simpson Strong-Tie Strong-Drive SDCFC TIMBER-CFC Screw is a heavy-duty structural fastener engineered specifically for cross-laminated timber (CLT) construction, mass timber construction, and general interior structural applications. At 23-5/8 in. in length with a 0.390 in. nominal diameter profile, this screw is built to handle the demands of large-sized structural members - from beam reinforcement and butt joints to wall-to-wall and floor-to-floor connections. The yellow zinc coating makes it well-suited for interior, dry-use environments where reliable, high-performance fastening in critical structural connections is required.

Key Features

• 23-5/8 in. Length with 22-1/4 in. Thread Length - delivers deep thread engagement across large structural members, maximizing holding strength in thick CLT panels and mass timber assemblies.
• 0.390 in. Nominal Diameter Profile - provides a robust shank capable of handling the shear and withdrawal loads common in heavy structural timber connections.
• T50 6-Lobe Drive Type - engineered for high-torque installation, reducing cam-out and giving installers greater control when driving long screws into dense timber.
• 0.525 in. Head Diameter with Cylinder Head Design - distributes clamping load evenly across the timber surface, helping prevent surface crushing in CLT and mass timber applications.
• Yellow Zinc Coating - protects the fastener in interior, dry environments, making it appropriate for permanent structural connections in conditioned or sheltered spaces.
• Broad Approved Application Range - suitable for beam reinforcement, splitting reinforcement, butt joints, support beams, and wall-to-wall or floor-to-floor systems, giving builders flexibility across a wide range of mass timber project needs.

Why This Product

• Purpose-built for CLT and mass timber construction - unlike general-purpose fasteners, this screw is specifically engineered for cross-laminated timber and mass timber applications, covering structural connections from splitting reinforcement to full floor-to-floor assemblies.
• Extra length for deep structural penetration - the 23-5/8 in. overall length and 22-1/4 in. thread length make this fastener practical for connecting thick timber members where standard-length screws fall short.
• High-torque drive system for confident installation - the T50 6-Lobe drive is designed to handle the resistance of dense structural timber, reducing installation frustration and the risk of fastener damage during driving.
• Reliable interior performance from a trusted structural brand - engineered by Simpson Strong-Tie for interior, dry-use structural applications, this screw is designed to meet the demands of critical load-bearing connections in professional timber construction.

Specifications

• Model Number: SDCFC272358
• Brand: Simpson Strong-Tie
• Series: Strong-Drive SDCFC TIMBER-CFC
• Length: 23-5/8"
• Shank Diameter: 0.29 in.
• Head Diameter: 0.525 in.
• Thread Length: 22-1/4 in.
• Drive Type: T50 6-Lobe
• Head Type: Cylinder Head
• Coating / Material: Yellow Zinc Coated
• Intended Use: Interior, dry applications only
• Pack Size: 50-Pack

Approved Applications

The SDCFC TIMBER-CFC Screw is engineered for the following structural and general interior applications:

• Cross-laminated timber (CLT) construction
• Mass timber construction
• Beam reinforcement
• Wall-to-wall connections
• Floor-to-floor connections
• Support beams
• Butt joints
• Splitting reinforcement
• General interior structural applications

Note: The yellow zinc coating is intended for interior, dry applications only. This product is not suitable for exterior, wet, or treated lumber applications.

What's Included

• 50 x Simpson Strong-Tie Strong-Drive SDCFC TIMBER-CFC Screws (Model SDCFC272358)

Frequently Asked Questions

What applications is the SDCFC272358 screw designed for?

This screw is engineered specifically for cross-laminated timber (CLT) construction, mass timber construction, and general interior applications. It is well-suited for beam reinforcement, wall-to-wall assemblies, floor-to-floor systems, support beams, butt joints, and splitting reinforcement in large-sized structural members.

What drive type is required to install this screw?

The SDCFC272358 uses a T50 6-Lobe drive, which is engineered for high-torque installation and reduced cam-out during driving.

Is this screw suitable for outdoor or high-moisture environments?

No. The screw features a yellow zinc coating that provides corrosion resistance appropriate for interior, dry-use environments only. It is not rated for exterior or high-moisture applications.

What are the key dimensions of this screw?

The screw has a nominal diameter of 0.390", an overall length of 23-5/8", and an extended thread length of 22-1/4" for maximum withdrawal resistance in timber members. The cylinder head has a low-profile design with a 0.525" diameter for a secure, flush-fit connection.