The Simpson Strong-Tie Strong-Drive SDCFC TIMBER-CFC Screw is a heavy-duty structural fastener built for the rigorous demands of cross-laminated timber and mass timber construction. Measuring 31 1/2 in. in length with an overall diameter of 0.390 in., this screw delivers the holding power and penetration depth required for large structural timber members. Its yellow-zinc coating is formulated specifically for interior, dry-use environments, making it a dependable choice for beam reinforcement, wall-to-wall connections, floor-to-floor connections, butt joints, and splitting reinforcement in controlled interior settings.

Key Features

• 31 1/2 in. Length with Deep Thread Engagement - A 30 1/8 in. thread length maximizes grip through thick timber members, providing the structural holding strength that CLT and mass timber assemblies demand.
• T50 6-Lobe Drive - This Torx-style drive design delivers superior torque transfer and significantly reduces cam-out during installation, allowing for confident, controlled driving into dense structural lumber.
• Cylinder Head Design - The low-profile cylinder head seats flush and cleanly against timber surfaces, supporting tight, precise connections in structural assemblies without compromising the face of the material.
• Yellow-Zinc Coating - Engineered for interior, dry applications, this corrosion-resistant coating protects the fastener in controlled environments, supporting long-term structural integrity where moisture exposure is not a concern.
• Broad Application Compatibility - Approved for CLT construction, mass timber framing, support beams, splitting reinforcement, and general interior structural connections, giving builders one reliable fastener across multiple joint types.

Why This Product

• Purpose-Built for Mass Timber and CLT - Unlike general-purpose construction screws, this fastener is specifically engineered for cross-laminated timber and mass timber applications, ensuring it meets the structural requirements these building methods demand.
• Exceptional Penetration for Thick Members - With nearly the full length of the screw threaded, it is well suited for spanning the deep connections found in structural butt joints, floor-to-floor assemblies, and beam reinforcement scenarios common in modern timber construction.
• Reduced Installation Effort, Greater Control - The T50 6-lobe drive minimizes slippage and cam-out, which translates to faster, cleaner installation in demanding structural work where precision and consistency matter.
• Trusted Simpson Strong-Tie Engineering - Backed by the Simpson Strong-Tie brand, this screw is part of a product line built to perform in structural applications where connection reliability is non-negotiable.

Specifications

• Model Number (MPN): SDCFC273112
• Brand: Simpson Strong-Tie
• Series: Strong-Drive SDCFC TIMBER-CFC
• Length: 31-1/2"
• Shank Diameter: 0.29 in.
• Head Diameter: 0.525 in.
• Thread Length: 30-1/8 in.
• Head Type: Cylinder Head
• Drive Type: T50 6-Lobe
• Coating / Material: Yellow-Zinc Coated
• Interior/Exterior Use: Interior, Dry Applications Only
• Pack Size: 50-Pack

Approved Applications

These structural screws are suited for the following construction applications:

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

What's Included

• 50 x Simpson Strong-Tie SDCFC273112 Strong-Drive SDCFC TIMBER-CFC Screws (0.390 x 31-1/2", Yellow-Zinc Coated)

Frequently Asked Questions

What types of construction is the SDCFC273112 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, butt joints, wall-to-wall connections, floor-to-floor connections, support beams, and splitting reinforcement.

What drive type and size does this screw use?

The SDCFC273112 uses a T50 6-lobe (Torx-style) drive. This design provides excellent torque transfer and helps reduce cam-out during installation, making it a reliable choice for heavy-duty structural fastening.

Is this screw suitable for outdoor or wet environments?

No. The yellow zinc coating on this screw is formulated specifically for interior, dry-use environments. It is not intended for outdoor, wet, or high-moisture applications where more corrosion-resistant coatings would be required.

What are the key dimensional specs of this screw?

The screw measures 31-1/2" in length with an overall diameter of 0.390". It features a low-profile cylinder head with a 0.525" head diameter and a thread length of 30-1/8", which maximizes thread engagement deep into large structural members.