The Simpson CB3BLGHL Fiber-Cement Board Screw is a collated fastener engineered for cement-board-to-wood applications involving coarse, porous, and softer materials. Designed for use with the Quik Drive PROLDHG2 underlayment/backerboard system, this #9 x 1-1/4 in. screw delivers fast, consistent installation across backerboard and underlayment projects, countersinking cleanly for a concealed, professional finish.

Key Features

• 0.375-in. ribbed wafer head with nibs - promotes controlled countersinking so screw heads sit flush without damaging the board surface, resulting in a clean, concealed finish
• #3 undersized square drive - reduces cam-out during installation for better bit engagement and more consistent drive depth; replacement bit model BIT3SU is available separately
• Alternating high-low threads - provide strong holding power in coarse, porous, and softer wood substrates while reducing stress on the material during fastening
• Sharp point - pierces fiber-cement board and wood substrates quickly without pre-drilling, speeding up installation
• C-3 mechanically galvanized coating - offers corrosion resistance suited to the moisture-exposed environments common in cement board and backerboard applications
• Straight collation - compatible with the Quik Drive PROLDHG2 system for high-speed, continuous fastening that reduces installer fatigue on large jobs
• 2 driver bits included - allows work to begin immediately out of the box, with a known replacement bit model for easy restocking

Why This Product

• Purpose-built for cement board installations - the combination of high-low threads, a sharp point, and a ribbed wafer head addresses the specific demands of fastening fiber-cement board to wood, producing a secure, flush result that generic screws cannot reliably match
• System-matched for the Quik Drive PROLDHG2 - straight collation and screw geometry are specifically designed around this underlayment/backerboard tool system, ensuring compatibility and consistent drive depth across every fastener
• Corrosion resistance where it matters - the C-3 mechanically galvanized coating is suited to the wet and moisture-prone conditions typical of backerboard, tile substrate, and underlayment environments, helping maintain fastener integrity over time
• Ready to work, packaged for productivity - with 1,500 collated screws and 2 driver bits included per box, installers have everything needed to handle high-volume cement board projects without interruption

Specifications

• Model No.: CB3BLGHL114S
• Screw Size: #9
• Length: 1-1/4 in.
• Head Type: Ribbed Wafer Head
• Drive Type: #3 Square, Undersized
• Thread Type: High/Low Threads
• TPI: 15
• Point Type: Sharp Point
• Coating: Mechanically Galvanized, C-3
• Collation Type: Straight
• Collation Angle: Straight
• Compatible Tool: Quik Drive PROLDHG2
• Packaging Quantity: 1,500

Approved Applications

• Cement board to wood (for coarse, porous, and softer materials)

What's Included

• 1,500 collated #9 x 1-1/4 in. CB3BLGHL screws
• 2 driver bits (replacement bit model: BIT3SU)

Frequently Asked Questions

What tool system is the CB3BLGHL114S designed to work with?

This collated screw is designed for use with the Quik Drive PROLDHG2 underlayment/backerboard system, enabling fast and consistent installation in cement-board-to-wood applications.

What type of coating does this screw have, and why does it matter for cement board applications?

The CB3BLGHL114S features a C-3 mechanically galvanized coating, which provides corrosion resistance suited to the demanding moisture-exposed environments common in cement board and backerboard installations.

What is the purpose of the high-low thread design on this screw?

The alternating high-low threads are specifically designed for fastening into coarse, porous, and softer materials such as wood substrates used in cement-board applications, promoting strong holding power while reducing material stress.

What drive bit does this screw require, and are replacement bits available?

This screw uses a #3 undersized square drive. Each box includes 2 driver bits. Replacement bits are available under model number BIT3SU.

Note: Product dimensions and/or thread length may differ from picture. Please refer to the specifications listed above for accurate product details.