Simpson #8 x 2-1/4 in. Hi-Lo T25 Cement Board Screw is a professional-grade fastener engineered specifically for securing cement backerboard in tile installations, wet-area applications, and other moisture-prone environments. Built around a high-low thread design and a multilayer corrosion-resistant coating over a coated zinc base, this screw is purpose-built to handle the demands of cement board fastening across all major backerboard brands.

Key Features

• T25 6-lobe drive - provides positive bit engagement, reducing cam-out and extending bit life so installations stay efficient and accurate
• High-low thread design - alternating thread profile makes driving easier and faster through dense cement backerboard, reducing installer fatigue
• Ribbed wafer head with nibs - seats flush with the cement board surface for a clean, tile-ready finish without grinding or shimming
• Multilayer corrosion-resistant coating over coated zinc - guards against rust stains in high-moisture environments where backerboard is most commonly installed
• Compatible with all major cement backerboards - works with HardieBacker, Durock, WonderBoard, and PermaBase, making it a versatile choice for a wide range of tile and wet-area projects

Why This Product

• Engineered for the job - the high-low thread and T25 6-lobe drive work together to make cement backerboard fastening faster and less physically demanding, a meaningful advantage on large tile or shower installations
• Moisture-ready construction - the multilayer corrosion-resistant coating over a coated zinc base is designed specifically to prevent rust staining in the wet environments where cement board is most often used
• Broad backerboard compatibility - approved for use with HardieBacker, Durock, WonderBoard, and PermaBase, so one screw covers virtually any cement board fastening application on a job site
• Professional finish out of the box - the ribbed wafer head with nibs self-seats flush, eliminating extra prep steps and leaving a surface that is immediately ready for tiling or other finish work

Specifications

• Model Number: CBHL214R100
• Screw Size: #8
• Length: 2-1/4 in.
• Head Diameter: 0.38 in.
• Head Type: Wafer Head
• Drive Type: T25 6-Lobe
• Coating Material: Coated Zinc

Approved Applications

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

What's Included

• 100 Simpson #8 x 2-1/4" Hi-Lo T25 Cement Board Screws
• 6-lobe T25 driver bit

Frequently Asked Questions

What types of cement backerboard are these screws compatible with?

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

What drive type is required to install these screws?

These screws use a T25 6-lobe drive. A replacement driver bit (BIT25T-2-R2) is available separately, and a T25 driver bit is included in the package.

How does the head design help achieve a professional finish?

The ribbed wafer head features nibs that allow the screw to seat flush with the surface of the cement board, providing a clean, professional finish ready for tiling or other finishing work.

What makes these screws resistant to rust and corrosion?

These screws feature a distinctive multilayer corrosion-resistant coating applied over a coated zinc base, which is specifically designed to prevent rust stains even in moisture-prone installation environments.

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