The CMT ITK Plus Diamond Saw Blade for Fiber Cement - 6-1/2" x 5/8", 4-Tooth TCG is a purpose-built cutting disc engineered for ultra-hard, abrasive materials including fiber cement siding, panels, and boards. Featuring diamond-tipped tooth technology with a Triple Chip Grind profile, this blade delivers cuts up to 60 times longer than traditional carbide blades, making it the go-to choice for contractors and installers working with products like HardiePlank, HardiePanel, Eternit, Swisspearl, Fermacell, and Ivarplank. Compatible with portable circular saws and miter saws, it handles a wide range of demanding building materials with precision and consistency.

Key Features

• Diamond-Tipped Tooth Technology (Material: DP) - diamond material provides exceptional hardness for cutting ultra-abrasive fiber cement products without rapid tooth wear, extending blade life dramatically compared to standard carbide options.
• Up to 60x Longer Life Than Traditional Carbide Blades - fewer blade changes during a project means less downtime, lower replacement costs, and more consistent results across an entire job site.
• Triple Chip Grind (TCG) Tooth Geometry - the alternating flat and chamfered tooth pattern is specifically matched to fiber cement cutting, producing clean, chip-free edges that protect the structural integrity of the panel.
• 4-Tooth, Low-Count Design - with only 4 teeth at a 10 deg. cutting angle, the blade moves material aggressively and keeps gullets clear, reducing heat buildup when slicing through dense, silica-rich fiber cement and thermoplastic materials.
• Kerf Thickness of 0.071" - a precisely controlled kerf removes just enough material for accurate cuts while minimizing dust and waste, which is especially important when working with abrasive cement-based products.
• Plate Thickness of 0.047" - a thinner plate reduces vibration and keeps the blade stable and true during extended cutting sessions on portable saws and miter saws.
• 6-1/2" Diameter with 5/8" (15.88mm) Bore - sized for the most common compact circular saws and miter saws used in residential and light commercial fiber cement installation work.
• Maximum 9,500 RPM Rating - rated for the high-speed operation of portable circular saws, ensuring safe, reliable performance at tool-rated speeds.

Why This Product

• Fiber cement siding materials like HardiePlank, HardiePanel, Eternit, and Swisspearl are notorious for destroying standard carbide blades quickly - this diamond blade is purpose-designed to outlast those blades by up to 60 times, dramatically reducing per-project cutting costs.
• The TCG tooth geometry is matched directly to the properties of fiber cement and related materials including Fermacell, Ivarplank, chipboard, MDF, plasterboard, and thermoplastics, so one blade handles the variety of materials common on a siding or renovation job.
• The 6-1/2" diameter and 5/8" bore fit directly onto the portable circular saws and miter saws that installers already use in the field - no adapter or specialty machine required.
• With a 9,500 RPM maximum speed rating, this blade is matched to the performance range of cordless and corded compact circular saws, giving installers confidence that the blade will perform safely and reliably at full tool speed.

Specifications

• Manufacturer Part Number: 236.004.06
• Brand: CMT Orange Tools
• Diameter: 6-1/2"
• Bore Diameter: 15.88mm (5/8")
• Number of Teeth: 4
• Tooth Grind Type: TCG (Triple Chip Grind)
• Cutting Angle: 10 deg.
• Teeth Thickness (Kerf): 0.071"
• Plate Thickness: 0.047"
• Maximum RPM: 9,500
• Tooth Material: DP (Diamond)
• Series: ITK Plus

Approved Applications

• Fiber cement siding and panels (HardiePlank, HardiePanel)
• Eternit fiber cement products
• Swisspearl fiber cement boards
• Fermacell boards
• Ivarplank
• Chipboard and MDF (generic wood-based sheet goods)
• Plasterboard
• Thermoplastic materials
• Ultra-hard building materials requiring long-life cutting performance

Frequently Asked Questions

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

The CMT ITK Plus Diamond Saw Blade is rated for up to 60 times longer cutting life than traditional carbide blades when used on fiber cement and other ultra-hard materials. This extended lifespan translates directly into fewer blade changes and lower tooling costs per project.

What saws is this blade compatible with?

This blade is designed for use with portable circular saws and miter saws. The 6-1/2" diameter and 5/8" (15.88mm) bore fit the most common compact saw platforms used for fiber cement installation. The blade is rated to a maximum of 9,500 RPM.

Why does a fiber cement blade only have 4 teeth?

The low 4-tooth count is intentional for cutting ultra-abrasive materials like fiber cement. Fewer teeth mean larger gullets between each tooth, which keeps the blade cool by clearing material quickly and reducing heat buildup during cuts. The TCG (Triple Chip Grind) geometry of each tooth handles the specific hardness of silica-rich fiber cement products without chipping or cracking the cut edge.

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 suited for cutting chipboard, MDF, plasterboard, and thermoplastic materials - making it a versatile option for renovation and remodeling work involving a range of ultra-hard or abrasive sheet materials.