The Simpson #8 x 1-5/8 in. Hi-Lo T25 Cement Board Screw is a professional-grade fastener engineered specifically for cement backerboard installations in tile, wet area, and moisture-prone applications. Featuring a high-low thread profile, a ribbed wafer head, and a distinctive multilayer corrosion-resistant coating, this Simpson fastener is built to deliver secure, rust-resistant performance wherever cement backerboard meets demanding conditions.

Key Features

• 6-lobe T25 drive - provides positive engagement with the driver bit, reducing cam-out and extending bit life for faster, more consistent installation
• High-low thread pattern - alternating thread heights drive more easily into cement backerboard, reducing the torque and effort required while maintaining a firm, lasting hold
• Ribbed wafer head with nibs - seats flush against the board surface for a clean, low-profile finish that does not interfere with tile or surface materials placed on top
• Multilayer corrosion-resistant coating - specifically engineered to resist rust and prevent rust staining, keeping installations looking clean in wet and tile environments
• Broad backerboard compatibility - approved for use with HardieBacker, Durock, WonderBoard, and PermaBase, making these screws a reliable choice across a wide range of cement board products

Why This Product

• Purpose-built for cement board work - every design element, from the high-low thread to the nibed wafer head, is tailored to the specific demands of fastening cement backerboard, so installers are not improvising with a general-purpose screw
• Rust protection where it matters most - the multilayer corrosion-resistant coating is engineered to prevent rust stains in tile and wet-area applications, helping protect both the installation and the finished surface long after the job is done
• Drives easier, works harder - the combination of the high-low thread and the positive-engagement T25 drive reduces installer fatigue and bit wear, making this screw a practical choice for projects involving high screw counts
• Trusted Simpson engineering - backed by the Simpson brand and approved for use with the most widely specified cement backerboard brands, this fastener offers the confidence of a name recognized across professional construction and tile installation trades

Specifications

• Model Number: CBHL158R150
• Screw Size: #8
• Length: 1-5/8 in.
• Head Type: Wafer Head
• Head Diameter: 0.38 in.
• Drive Type: T25 6-Lobe
• Coating Material: Coated Zinc (Multilayer Corrosion-Resistant)

Approved Applications

• Cement board fastening applications
• Attaching HardieBacker cement backerboard
• Attaching Durock cement backerboard
• Attaching WonderBoard cement backerboard
• Attaching PermaBase cement backerboard

What's Included

• 150 cement board screws (#8 x 1-5/8")
• 6-lobe T25 driver bit

Frequently Asked Questions

What type of cement backerboards are these screws compatible with?

These screws are designed for use with all cement backerboards, including HardieBacker, Durock, WonderBoard, and PermaBase.

What drive type does the CBHL158R150 screw use?

The screw uses a 6-lobe T25 drive, which provides positive engagement to improve bit life. A replacement driver bit (BIT25T-2-R2) is available separately, and a T25 bit is included in the package.

How does the coating on these screws prevent rust stains?

The screws feature a distinctive multilayer corrosion-resistant coating that is specifically engineered to prevent rust stains, making them suitable for use in tile and moisture-prone installation areas.

Why do these screws use a high-low thread design?

The high-low thread pattern is designed for easier driving into cement backerboard, reducing the effort and torque required during installation while maintaining a secure hold.

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