The Simpson CB3BLG Fiber-Cement Board Screw is a collated fastener engineered specifically for dense fiber-cement-to-wood applications, including fiber-cement siding and underlayment/backerboard installations. Designed for use with the Quik Drive PROLDHG2 underlayment/backerboard system, this #10 x 1-5/8 in. coarse-thread screw combines a ribbed wafer head with countersinking nibs, a Type-17 point, and a C-3 mechanically galvanized coating to deliver fast, clean, and corrosion-resistant fastening in demanding board applications.

Key Features

• 0.375-in. ribbed wafer head with nibs for easy countersinking - the ribbed wafer profile and built-in nibs drive the head flush with the board surface for a clean, concealed finish without additional prep work
• #3 undersized square drive with 2 driver bits included - the undersized square recess provides positive bit engagement to reduce cam-out, and the included bits (replacement model BIT3SU) mean you can get to work right out of the box
• Coarse threads at 10 TPI - the coarse thread pattern bites aggressively into dense fiber-cement board and the wood substrate beneath, creating a strong, secure hold
• Type-17 point - the self-drilling point cuts through dense fiber-cement material efficiently, reducing drive time and minimizing surface cracking
• C-3 mechanically galvanized coating - provides corrosion resistance suited for fiber-cement siding and backerboard environments where long-term coating durability matters
• Straight collation - compatible with the Quik Drive PROLDHG2 system for automated, high-volume fastening that significantly speeds up installation compared to hand-driving individual screws

Why This Product

• Purpose-built for fiber-cement board - every design element, from the coarse threads and Type-17 point to the ribbed wafer head with countersinking nibs, is specifically configured for dense fiber-cement-to-wood fastening, so installers get consistent results without adapting a general-purpose screw
• System-ready collated format - straight collation and compatibility with the Quik Drive PROLDHG2 underlayment/backerboard system allow for rapid, repetitive fastening across large surface areas, reducing installer fatigue and increasing job-site productivity
• Clean, professional finish built into the fastener - the ribbed wafer head with nibs countersinks flush on contact, eliminating the need for pre-drilling countersinks and producing a concealed fastener look ready for finishing
• Corrosion-resistant coating for lasting performance - the C-3 mechanically galvanized coating helps the screws hold up in the moisture-exposed conditions common to siding and backerboard applications, supporting the long-term integrity of the installation

Specifications

• Model No.: CB3BLG158S
• Screw Size: #10
• Length: 1-5/8 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

• Fastening Fiber-Cement Siding
• Dense fiber-cement board to wood

What's Included

• 1,500 CB3BLG158S collated fiber-cement board screws
• 2 driver bits (replacement bit model: BIT3SU)

Frequently Asked Questions

What tool is the CB3BLG158S designed to be used with?

This collated screw is designed for use with the Quik Drive PROLDHG2 underlayment/backerboard system, which automates and speeds up the fastening process for fiber-cement board applications.

What type of drive does the CB3BLG158S require, and are bits included?

The CB3BLG158S uses a #3 undersized square drive. Each box includes 2 driver bits. If replacements are needed, the compatible replacement bit model is BIT3SU.

What makes this screw suitable for fiber-cement board installation?

The CB3BLG158S features a 0.375-in. ribbed wafer head with nibs for easy countersinking, coarse threads for strong purchase in dense material, and a Type-17 point for efficient penetration - all designed specifically for fiber-cement-to-wood applications with a clean, concealed finish.

What corrosion protection does the C-3 mechanically galvanized coating provide?

The C-3 mechanically galvanized coating is a robust zinc coating applied through a mechanical process, providing enhanced corrosion resistance suitable for demanding exterior and construction environments where fiber-cement siding is typically installed.

Note: Product dimensions and/or thread length may differ from picture. Please see the item description above for specifications.