The CMT ITK Plus Diamond Saw Blade for Fiber Cement - 7-1/4" x 5/8", 4-Tooth TCG is engineered specifically for cutting ultra-hard building materials like fiber cement siding, panels, and board products. Built around a 4-tooth Triple Chip Grind (TCG) diamond-tipped configuration, this blade delivers cuts that last up to 60 times longer than traditional carbide blades - making it the go-to choice for contractors and installers who regularly work with Hardie products, Eternit, Swisspearl, Fermacell, and Ivarplank. Compatible with portable circular saws and miter saws, it handles the punishing abrasiveness of fiber cement with precision and durability that carbide simply cannot match.

Key Features

• Diamond-tipped tooth material (DP) - specifically selected for ultra-hard materials, providing cutting longevity that extends up to 60x beyond traditional carbide blades, dramatically reducing blade change frequency on the job site.
• 4-Tooth Triple Chip Grind (TCG) geometry - the alternating tooth profile is designed to shear through dense fiber cement cleanly, reducing edge chipping and cracking that can compromise board integrity.
• 10 deg. cutting angle - optimized hook angle for controlled, stable feed through abrasive fiber cement and composite sheet materials without grabbing or binding.
• 7-1/4" diameter with 5/8" bore (15.88mm) - the standard circular saw arbor size ensures direct compatibility with the widest range of portable circular saws and miter saws on the market.
• 0.071" kerf thickness over a 0.047" plate - the wide kerf relative to plate thickness provides clearance and reduces heat buildup and friction when ripping through dense, abrasive board products.
• 8,300 RPM maximum rating - rated for the high speeds of portable circular saws, ensuring safe and efficient performance at tool operating speeds.
• Broad material compatibility - cuts Eternit, Swisspearl, Fermacell, Ivarplank, HardiePlank, HardiePanel, Chipboard, MDF, plasterboard, and thermoplastic materials, making this a versatile blade for mixed-material job sites.

Why This Product

• Fiber cement is notoriously hard on blades - the diamond DP material construction of this blade addresses that directly, lasting up to 60x longer than carbide alternatives and reducing the cost and downtime of frequent blade replacements.
• Works with the tools you already own - the 7-1/4" diameter and standard 5/8" bore fit the portable circular saws and miter saws most commonly found on residential and commercial siding job sites, requiring no special adapters.
• Handles the full fiber cement product lineup - from HardiePlank lap siding to HardiePanel vertical siding, Swisspearl, Fermacell, and Eternit, this single blade covers the materials installers encounter most often, simplifying tool setup.
• Also cuts beyond fiber cement - the TCG diamond configuration extends usefulness to Chipboard, MDF, plasterboard, and thermoplastic materials, so the blade continues earning its keep even on mixed-material projects.

Specifications

• Manufacturer Part Number: 236.004.07
• Brand: CMT Orange Tools
• Diameter: 7-1/4"
• Number of Teeth: 4
• Bore Diameter: 15.88mm (5/8")
• Tooth Grind Type: TCG (Triple Chip Grind)
• Kerf Thickness: 0.071"
• Plate Thickness: 0.047"
• Cutting Angle: 10 deg.
• Maximum RPM: 8,300
• Tooth Material: DP (Diamond)

Approved Applications

• Fiber cement siding and panels (HardiePlank, HardiePanel, Ivarplank)
• Eternit fiber cement products
• Swisspearl fiber cement panels
• Fermacell boards
• Chipboard and MDF
• Plasterboard
• Thermoplastic materials
• Use with portable circular saws and miter saws

Frequently Asked Questions

How much longer does this diamond blade last compared to a standard carbide blade?

According to the product data, this CMT ITK Plus diamond blade is rated for up to 60 times longer life than traditional carbide blades when cutting fiber cement and other ultra-hard materials. This significant longevity advantage means fewer blade changes and lower overall tooling cost on large siding installation projects.

What is the maximum RPM for this blade, and will it work with a standard circular saw?

This blade is rated for a maximum of 8,300 RPM, which covers the operating speeds of most standard portable circular saws and miter saws. Always verify that your saw's rated RPM does not exceed the blade's 8,300 RPM maximum before use.

Can this blade cut materials other than fiber cement?

Yes. In addition to fiber cement products such as HardiePlank, HardiePanel, Eternit, Swisspearl, Fermacell, and Ivarplank, this blade is also listed for cutting Chipboard, MDF, plasterboard, and thermoplastic materials - making it useful on job sites where multiple panel and sheet products are in use.

What does the Triple Chip Grind (TCG) tooth geometry mean for cut quality on fiber cement?

The TCG grind uses an alternating high-low tooth pattern specifically suited to brittle and abrasive materials like fiber cement. This geometry helps minimize edge chipping and cracking as the blade cuts through dense boards, resulting in cleaner edges that reduce the need for additional trimming or finishing work.