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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 f​eatures​

  • 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.

Learn more

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 most efficiently.

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 consists of CVD- and PVD-coated carbide and ceramic grades for various machining conditions. Use the information below to find the right grade for your production.



Application area
Machining conditions:

Good

Average

Difficult

Application area
Machining conditions:

Good

Average

Difficult



CB7105

First-choice CBN grade for low feed and continuous cuts in stable conditions at highest speed, 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 speed, 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 to avoid 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 to avoid 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 to avoid micro-vibrations.

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

See complete assortment

CB7015

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

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

CB7025

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

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

CB7525

CBN grade for heavy interrupted cuts at low to medium speed, in case and induction hardened steel.

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

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

See complete assortment

CB7925

Solid CBN grade originally designed for high alloyed cast iron, which also works as a complement in hardened steels with greater depth of cut or higher feed at low to medium speed.

T-Max®: For productive turning of difficult-to-machine materials

See complete assortment

Complementary grades

CC670

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

View complete assortment​

CC6050

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

View complete assor​tment

GC4305

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

View complete assortment

GC4315

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

View complete assortment

H13A

​Uncoated carbide grade that combines good abrasive wear resistance and toughness for turning hardened materials at low speed.​

View complete assortment​

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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