The Simpson CB3BLG Fiber-Cement Board Screw (Collated) - #10 x 1-1/4 in., C-3 Mechanically Galvanized, 1,500-Quantity is engineered by Simpson for dense fiber-cement board to wood fastening applications. Designed specifically for use with the Quik Drive PROLDHG2 underlayment and backerboard system, this straight-collated screw combines a ribbed wafer head, coarse threads, and a Type-17 point to deliver fast, clean, and flush fastening results on fiber-cement siding, underlayment, and backer board installations.

Key Features

• 0.375-in. ribbed wafer head with nibs - promotes easy, consistent countersinking so the screw sits flush or below the surface for a clean, concealed finish on fiber-cement board
• #3 undersized square drive - reduces cam-out during installation, keeping the bit seated securely for more controlled, efficient driving (2 driver bits included per box; replacement bit model BIT3SU)
• Coarse threads at 10 TPI - grip dense fiber-cement and wood substrates firmly, resisting pull-through and maintaining holding strength over time
• Type-17 point - cuts cleanly into the substrate on contact, reducing splitting and allowing the screw to start without pre-drilling
• C-3 mechanically galvanized coating - provides durable corrosion resistance suited to fiber-cement board and wood fastening applications where long-term protection matters
• Straight collation - compatible with the Quik Drive PROLDHG2 system for high-speed, consistent collated driving that keeps work moving on larger installations

Why This Product

• Purpose-built for fiber-cement fastening - the CB3BLG is specifically designed for dense fiber-cement board to wood applications, so every detail of its thread pattern, point type, and head geometry works together for reliable performance in this demanding use case
• System-matched for the Quik Drive PROLDHG2 - straight collation and included driver bits mean this screw integrates directly with the Quik Drive PROLDHG2 underlayment and backerboard system, reducing setup time and keeping installation efficient
• Clean, professional finish built into the design - the ribbed wafer head with nibs countersinks consistently without additional steps, making it a practical choice for visible fiber-cement siding and backer board work where surface appearance matters
• Corrosion-resistant coating for lasting performance - the C-3 mechanically galvanized finish adds a layer of protection against the elements, supporting long-term durability in underlayment, backerboard, and fiber-cement siding applications

Specifications

• Model No.: CB3BLG114S
• Screw Size: #10
• Length: 1-1/4 in.
• Head Type: Ribbed Wafer Head
• Head Diameter: 0.383 in.
• Drive Type: #3 Square, Undersized
• Thread Type: Coarse Threads
• TPI: 10
• Point Type: Type-17 Point
• Coating: Mechanically Galvanized, C-3
• Collation Type: Straight
• Collation Angle: Straight
• Compatible Tool: Quik Drive PROLDHG2
• Packaging Quantity: 1,500

Approved Applications

• Dense fiber-cement board to wood fastening
• Fastening Wood-to-Wood
• Underlayment and backerboard installation with the Quik Drive PROLDHG2 system

What's Included

• 1,500 collated #10 x 1-1/4 in. CB3BLG fiber-cement board screws
• 2 driver bits included (replacement bit model: BIT3SU)

Frequently Asked Questions

What type of coating does the CB3BLG114S screw have, and why does it matter?

This screw features a C-3 mechanically galvanized coating, which provides a durable, corrosion-resistant finish suitable for fiber-cement board and wood fastening applications where long-term performance and protection are important.

What drive tool or system is the CB3BLG114S compatible with?

The CB3BLG114S is designed for use with the Quik Drive PROLDHG2 underlayment/backerboard system. Each box includes 2 driver bits, and replacement bits are available under model number BIT3SU.

How does the ribbed wafer head design benefit the installation?

The 0.375-in. ribbed wafer head features nibs that assist with easy countersinking, allowing the screw to sit flush or slightly below the surface of the fiber-cement board for a clean, concealed finish.

What is the collation style of this screw, and how many screws come in a box?

The CB3BLG114S uses straight collation, making it compatible with collated screw driving systems. Each box contains 1,500 screws, providing an efficient, high-volume supply for large underlayment and backerboard projects.

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