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Turning inserts and grades for hardened steel

CB7125

​This CBN grade is your first choice for case and induction hardened steels. With its medium content of boron nitride, it is suitable for light to medium interrupted cuts.

Benefits and features​

  • PVD coating with good fracture resistance
  • Stable and predictable tool life
  • Efficient machining with good surface finish

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High performance hard part turning inserts

The new generation CBN grades are specifically designed to handle typical hard part turning machining challenges, such as surface and dimensional tolerance demands with competitive tool life, most efficiently.

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Achieve Good Surface Finish in HPT

Hard part turning has been proven to reduce machining time and costs by 70% or more.

Find Your Solution for Hard Part Turning

Achieve high productivity and outstanding quality with our Hard Part Turning (HPT) solutions for all of your component design or surface finish requirements.

CBN insert with integral chip breaker

Increase productivity with a single cut strategy for hard-to-soft rough machining of automotive components such as gears, crown wheels, shafts and case-hardened components.

What’s new?

CB7125 and CB7135

The new generation CBN grades CB7125 and CB7135 are designed to break new ground in medium to heavy interrupted hard part turning. The grades are optimized to handle high surface and dimensional tolerance demands in the most efficient manner.

Benefits

  • Longer and more stable and consistent tool life​
  • Efficient and secure machining with good surface finish
  • Consistent dimensional tolerances​
  • Lower cost per part when aiming for a one-cut strategy at high speed
  • New PVD coating of CB7125 for improved wear resistance

Learn More


CB7125 and CB7135 inserts

Find your grade

Our hardened material insert grade assortment mainly consists of uncoated and PVD-coated CBN grades for various machining conditions. We also have complementary grades. Use the information below to find the right grade for your production.



Application area
Machining conditions:

Good

Average

Difficult



CB7105

First-choice CBN grade for low feed and continuous cuts in stable conditions at highest speeds in case and induction hardened steel.

CoroTurn® 107: First choice for external and internal machining of small and slender components.

CoroTurn® TR: Extremely stable system that avoids micro-vibrations.

T-Max® P: First choice for general turning from small components to heavy machining.

See complete assortment

CB7115

First-choice CBN grade for high feed and/or depth of cut in continuous to light interrupted cuts at high speeds in case and induction hardened steels.

CoroTurn® 10​7: First choice for external and internal machining of small and slender components.

CoroTurn® TR: Most stable system for avoiding micro-vibrations.

T-Max® P: First choice for general turning from small components to heavy machining.

CoroTurn® 1-2: For highest productivity and close surface finish tolerances.

See complete assortment

CB7125

First-choice CBN grade designed to deliver stable and predictable tool life while machining case and induction hardened steels with light to medium interrupted cuts (chamfered component edges).

CoroTurn® 107: First choice for external and internal machining of small and slender components.

CoroTurn® TR: Most stable system for avoiding micro-vibrations.

T-Max® P: First choice for general turning from small components to heavy machining.

See complete assortment

CB7135

First-choice CBN grade designed to deliver stable and predictable tool life while machining case and induction hardened steels with heavy interrupted cuts (unchamfered component edges).

CoroTurn® 107: First choice for external and internal machining of small and slender components.

CoroTurn® TR: Most stable system for avoiding micro-vibrations.

T-Max® P: First choice for general turning from small components to heavy machining.

See complete assortment

Complementary grades

CB7025

Complementary CBN grade for medium to light interruptions and continuous cuts at medium speeds in case and induction hardened steels.

View complete assortment

CB7015

Complementary CBN grade with low CBN content. Use in continuous cuts to light interrupted cuts at high speeds in case and induction hardened steels.

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CB7525

Grade with high CBN content suitable for ISO K finishing at high speeds and as a complementary grade for heavy interrupted cuts at low to medium speeds in case and induction hardened steel.

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CC670

​Whisker-reinforced SiAlON-based ceramic with excellent bulk toughness, recommended for hardened steel under unfavorable conditions.

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CC6050

​Mixed Al2O3-based ceramic with good thermal properties and wear resistance, primarily recommended for light to continuous finishing.

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GC4305

​CVD-coated carbide grade for medium to roughing applications with continuous cuts at low speeds in hardened materials.

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GC4315

​CVD-coated carbide grade for finishing to roughing in applications with continuous cuts to light intermittence in hardened materials.

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CB7925

Solid CBN grade, originally designed for high-alloyed cast iron, but also works as a complement in hardened steels with greater depths of cut or higher feeds at low to medium speeds.

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Highlights

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Hard Part Turning with CB7105 and CB7115

The new grades are based on the newest generation cubic boron nitride (CBN) material. This material enhances crater wear resistance and fracture resistance at high cutting speed in case-hardened and induction-hardened material.

Struggling to Find the Right Tool for the Job?

Let CoroPlus® ToolGuide find quick and accurate tool recommendations— on all of your devices!

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Hard part turning with CB7125 and CB7135

New generation CBN grades optimized for medium- to heavy-interrupted cuts. These grades deliver longer and more stable tool life, good surface finish and consistent dimensional tolerances, even at higher cutting parameters.

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