CNGA120412TM-MW2 WBH30 MW2 Wendeplatten - Walter Tools

Take advantage of the combination of CBN wear resistance, a rhombic 80° geometry and the MW2 chipbreaker for reliable hard turning and predictable tool life; order directly via Metav Werkzeuge or consult our specialists for application-specific parameters.

CNGA120412TM-MW2 WBH30 – Indexable turning insert, CBN grade, rhombic 80° (Walter Tools)

The CNGA120412TM-MW2 WBH30 is an indexable turning insert engineered for hard machining of hardened steels and comparable high-wear materials, offering stable cutting performance and consistent dimensional control.

• CBN grade WBH30 for extreme wear resistance
• Rhombic 80° insert geometry for stable cutting
• 1.2 mm corner radius for accurate profile control
• MW2 chipbreaker optimised for hard-material chips

Improved process reliability for hard turning

The combination of CBN cutting material and the WBH30 grade targets high-wear applications where conventional carbides fail. CBN provides exceptional hardness and thermal stability, which translates into longer tool life when machining hardened steels and pre-hardened components. The negative rake angle (0° (negative)) increases edge robustness under heavy cutting forces, reducing the risk of premature edge chipping. For production-focused shops, this means fewer insert changes, more predictable cycle times and a measurable increase in machining uptime.

Better surface finish and repeatable geometry control

The rhombic 80° plate form and a 1.2 mm corner radius are selected to balance insert strength with the capacity to maintain profile accuracy. A larger corner radius reduces local stress concentration at the cutting edge and supports stable engagement in interrupted cuts, while the rhombic geometry enables a controlled approach angle that helps maintain consistent surface roughness. When combined with the MW2 chipbreaker, chip formation is guided to reduce re-cutting and minimise workpiece damage. The result is improved first-pass quality and less downstream rework in precision turning operations.

Practical application advice and operational benefits

The insert is designed for hard machining tasks in serial production and toolroom settings where process stability is paramount. The chipbreaker and geometry are optimised to handle the brittle, abrasive chips typical of hard materials; however, correct seat clamping and recommended machining parameters remain essential for best performance. Application-oriented data, such as suggested cutting speeds and feeds for specific hardness ranges, can significantly extend insert life and improve repeatability. For tailored recommendations and cutting data, Metav Werkzeuge’s consultants can advise on grade selection and machining strategies to match individual machines and component requirements.

Contact Metav Werkzeuge for a machining consultation on the CNGA120412TM-MW2 WBH30; our specialists provide application-specific cutting data and local support to integrate this CBN insert into your production process.

Technical Data

• Article number: CNGA120412TM-MW2-WBH30-WALTER
• Designation: CNGA120412TM-MW2 WBH30
• Product type: Drehwendeschneidplatte / indexable turning insert
• Manufacturer: Walter Tools
• Series: Walter CBN / Hartstoff
• Grade: WBH30
• Execution: A

Facts

• Corner radius: 1.2 mm
• Plate size: 12
• Thickness code: 04
• Free angle: 0° (negative)
• Tolerance class: G

Special features

• Cutting material: CBN (WBH30)
• Chipbreaker: MW2
• Plate form: Rhombus 80°
• Suitable for: hardened steels (ISO group H)
• Application: hard machining / hard turning

FAQ

Which materials is this insert intended for?
The CNGA120412TM-MW2 WBH30 is intended primarily for hardened steels and similar hard materials; the WBH30 CBN grade is selected for high wear resistance in hard machining tasks.

What does the MW2 chipbreaker do?
The MW2 chipbreaker controls chip formation during hard turning, promoting short, segmented chips that are easier to evacuate and that reduce re-cutting and workpiece surface damage.

How does the rhombic 80° geometry affect cutting performance?
Rhombic 80° geometry offers a stable cutting approach with good edge support, which helps maintain surface quality and dimensional accuracy under high contact stresses.

Is the negative free angle important for heavy cuts?
Yes, the 0° (negative) free angle increases edge strength and resistance to chipping during heavy or interrupted cuts, improving tool life in demanding hard-turning operations.

Manufacturer/Responsible: Walter Deutschland GmbH, Derendinger Straße 53, 72072 Tübingen

The Walter AG (brand appearance: Walter Tools), headquartered in Tübingen, is one of the world’s leading manufacturers of precision metalworking tools and is part of the Sandvik Group. Protected trademarks and product names are the property of their respective owners. Brand names and registered trademarks are mentioned for explanation only; there is no affiliation between our company and the named brands. The offered item is original and factory-new from the manufacturer.