Simpson #8 x 1-5/8 in. Hi-Lo T25 Cement Board Screw is a professional-grade fastener engineered specifically for securing cement backerboard in tile and construction applications. The high-low thread design drives cleanly and consistently into cement board substrates, while the distinctive multilayer corrosion-resistant coating over a coated zinc base helps prevent rust stains in wet and moisture-prone installations. A T25 6-lobe driver bit is included in each package so work can begin immediately.

Key Features

• 6-lobe T25 drive - delivers positive engagement between the bit and screw head, reducing cam-out and extending bit life during high-volume backerboard installations.
• High-low thread design - alternating thread pitch makes driving easier and faster through cement board, reducing effort and fatigue on the job.
• Ribbed wafer head with nibs - seats flush against the backerboard surface for a clean, tile-ready finish without proud fastener heads.
• Multilayer corrosion-resistant coating over coated zinc - protects against rust stains in wet areas, making these screws well suited for shower surrounds, bathroom floors, and other moisture-prone tile substrates.
• Broad backerboard compatibility - approved for use with HardieBacker, Durock, WonderBoard, and PermaBase, eliminating the need to stock multiple screw types for different board brands.
• Includes a T25 driver bit - everything needed for installation arrives in one package, saving a trip to source a separate bit before work begins.

Why This Product

• Purpose-built for cement board fastening - the high-low thread and ribbed wafer head are specifically designed for the demands of backerboard installation, not adapted from a general-purpose fastener, so performance is consistent across cement board applications.
• Corrosion resistance where it matters most - the multilayer coating over a coated zinc base is engineered to resist rust staining in the wet, humidity-heavy environments where tile backerboard is most commonly installed.
• Works across leading backerboard brands - compatibility with HardieBacker, Durock, WonderBoard, and PermaBase means one box of Simpson cement board screws can carry through an entire project regardless of which board brand is on site.
• Ready-to-install package - the included 6-lobe T25 driver bit means no additional tooling needs to be tracked down before starting, keeping tile substrate prep on schedule.

Specifications

• MPN: CBHL158R600
• Screw Size: #8
• Length: 1-5/8 in.
• Head Diameter: 0.38 in.
• Head Type: Wafer Head
• Drive Type: T25 6-Lobe
• Coating Material: Coated Zinc
• Quantity: 600 count

Approved Applications

• Cement board fastening applications
• Installation of HardieBacker cement backerboard
• Installation of Durock cement backerboard
• Installation of WonderBoard cement backerboard
• Installation of PermaBase cement backerboard
• Tile substrate preparation in wet and moisture-prone areas

What's Included

• 600 x #8 x 1-5/8" Hi-Lo T25 Cement Board Screws
• 6-lobe T25 driver bit

Frequently Asked Questions

What type of drive does the CBHL158R600 cement board screw use?

This screw uses a 6-lobe T25 drive, which provides positive engagement between the bit and screw head to reduce cam-out and extend bit life. A replacement driver bit (BIT25T-2-R2) is also available separately.

Is a driver bit included with this package of screws?

Yes. Each package of CBHL158R600 screws includes a 6-lobe T25 driver bit, so you can begin installation right away without needing to source a separate bit.

What backerboard brands are these screws compatible with?

These Simpson cement board screws are designed for use with all cement backerboards, including HardieBacker, Durock, WonderBoard, and PermaBase, making them a versatile choice for tile installation projects.

How does the coating on these screws help prevent rust stains?

The CBHL158R600 features a distinctive multilayer corrosion-resistant coating over a coated zinc base. This multilayer system is specifically designed to resist corrosion and prevent rust stains from bleeding through tile and grout over time.

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