The Simpson #8 x 1-1/4 in. Collated Flat Head Wood-to-CFS Screw is purpose-built for attaching wood and wood structural panel sheathing to cold-formed steel framing. With an 18 TPI thread pattern, a self-drilling drill point, and yellow-zinc coating, this screw is engineered to deliver secure, flush-seated connections in light-gauge steel framing applications. Curved collation makes it a direct fit for Quik Drive auto-feed screw systems, supporting fast, consistent installation across sheathing and panel attachment work.

Key Features

• Flat head profile - sits flush with the work surface for a clean, low-profile finish that requires no countersinking
• 18 TPI thread pattern - provides a secure, vibration-resistant bite into cold-formed steel framing for a reliable hold
• Self-drilling drill point (Point Size 2) - penetrates cold-formed steel without a pilot hole, reducing steps and speeding up installation
• Yellow-zinc coating - adds a corrosion-resistant barrier suited to interior light-gauge steel framing environments
• Curved collation - engineered specifically for Quik Drive PRO200G2 and PRO200SG2 auto-feed systems, ensuring consistent feeding and minimal jamming
• #2 square drive - a widely compatible drive type that reduces cam-out and keeps installation moving efficiently

Why This Product

• Designed for CFS framing from the ground up - the combination of an 18 TPI thread, a self-drilling point, and a flat head makes this screw a purpose-matched solution for wood-to-cold-formed-steel sheathing attachment, not a general-purpose fastener pressed into service
• Compatible with leading auto-feed screw systems - curved collation sized for the Quik Drive PRO200G2 and PRO200SG2 means crews can rely on smooth, high-speed feeding without constant reloading or misfires
• No pre-drilling required - the self-drilling drill point cuts directly into cold-formed steel framing up to 3/16 in. thick, eliminating a preparation step and keeping production framing and panel installation moving
• Flush finish every time - the flat head seats cleanly against wood sheathing and structural panels, delivering a professional surface that needs no additional finishing before the next trade follows

Specifications

• Model Number (MPN): FHSD114S0818
• Screw Size: #8
• Length: 1-1/4 in.
• Head Type: Flat Head
• Head Diameter: 0.310 in.
• Drive Type: #2 Square
• TPI: 18
• Max. Grip Length: 0.858 in.
• Point Type: Drill Point
• Point Size: 2
• Coating / Material: Yellow-Zinc Coated
• Collation: Curved Collation
• Compatible Tools: Quik Drive PRO200G2, PRO200SG2
• Packaging Quantity: 2,500

Approved Applications

• Fastening wood or wood structural panel sheathing to cold-formed steel (CFS) framing
• Recommended for use with cold-formed steel at a maximum steel thickness of 3/16"
• Suitable for use with Quik Drive PRO200G2 and PRO200SG2 auto-feed collated screw systems

What's Included

• 2,500 x Simpson FHSD114S0818 #8 x 1-1/4" Collated Flat Head Wood-to-CFS Screws (Yellow-Zinc Coated)

Frequently Asked Questions

What auto-feed screw systems are compatible with these collated screws?

These screws are designed for use with the Quik Drive PRO200G2 and PRO200SG2 auto-feed collated screw systems. The curved collation is specifically engineered to ensure reliable feeding performance in these systems.

Do these screws require pre-drilling into cold-formed steel framing?

No pre-drilling is required. Each screw features a self-drilling drill point (Point Size 2) that allows clean penetration directly into cold-formed steel framing without the need for a pilot hole, speeding up installation on framing and sheathing projects.

What drive type is required to install these screws?

These screws use a #2 square drive, which is compatible with #8 screws. If a replacement bit is needed, the BIT2S is the recommended replacement bit for use with these fasteners.

What is the thread design on these screws, and why does it matter for cold-formed steel applications?

These screws feature an 18 TPI (threads per inch) thread pattern, which is optimized for secure engagement in cold-formed steel substrates. This thread design helps create a vibration-resistant connection, making it well-suited for structural sheathing and panel attachment to light-gauge steel framing.