CNGA120408TM-2 WBH20 WBH20 Wendeplatten - Walter Tools

Take advantage of the combination of CBN wear resistance, a negative 0° rake and the stable Rhombus 80° geometry for steady hard-turning results; order the CNGA120408TM-2 WBH20 directly via Metav Werkzeuge or ask our consultants if needed.

CNGA120408TM-2 WBH20 indexable turning insert — CBN grade for hardened steels (Walter Tools)

The CNGA120408TM-2 WBH20 is a negative‑rake, rhombic 80° CBN insert designed for precise hard‑turning of hardened steels and related high‑wear materials.

• CBN-grade WBH20 for hard turning
• Negative 0° rake for stable cutting
• Rhombic 80° geometry for versatile indexing
• 0.8 mm corner radius for defined contours

Consistent performance on hardened components

The combination of CBN as the cutting material and the WBH20 grade gives reliably low wear rates during hard‑turning operations on hardened steels. CBN (cubic boron nitride) is specifically engineered to withstand high contact temperatures and abrasive wear; this means fewer tool changes and more predictable part tolerances in serial production. With a negative 0° rake, the insert promotes a robust cutting edge that resists chipping under heavy radial loads, enhancing process stability in demanding turning cycles.

Efficiency through geometry and chip control

The Rhombus 80° form and the integrated chipbreaker 2 deliver predictable chip formation for typical hard‑machining scenarios. Controlled chips reduce interruptions and protect the workpiece surface, so cycle times fall and downstream grinding or finishing steps are simplified. The 0.8 mm corner radius supports defined contouring without compromising edge strength, making the insert suitable for finishing where consistent surface quality and dimensional accuracy are required.

Application guidance and workplace benefits

This insert is optimised for materials classified under group H — hardened steels — and is intended for reliable hard‑machining tasks such as finishing and semi‑finishing of quenched components. The robust grade and geometry yield longer in‑process life and improved process security on high‑hardness work, which helps to lower overall machining costs. For toolholders, clamping and coolant strategies, the insert matches standard CNGA toolholder interfaces; adapt cutting data to part geometry and machine rigidity for best results. For further machining parameters or compatibility checks, Metav Werkzeuge provides technical guidance and cutting data.

For machining hardened steels with Walter Tools’ WBH20 CBN grade, contact Metav Werkzeuge for tailored tooling recommendations and ordering support.

Technical data

• SKU: CNGA120408TM-2-WBH20-WALTER
• Designation: CNGA120408TM-2 WBH20
• Series: Walter CBN / Hartstoff
• Plate form: Rhombus 80°
• Tolerance class: G

Core measurements

• Inscribed circle: 12 mm
• Thickness: 04
• Corner radius: 0.8 mm
• Clearance angle: 0° (negative)
• Chipbreaker: 2

Special features

• Grade WBH20 (CBN cutting material)
• Designed for hardened steels and pre‑hardened steel
• Stable negative rake for secure cutting edge
• Optimised chip control for hard machining
• Suitable for finishing and hard turning applications
• Walter Tools brand quality

FAQ

What materials is this insert suitable for?
The CNGA120408TM-2 WBH20 is designed primarily for hardened steels (ISO group H); the WBH20 CBN grade gives the wear resistance needed for hard‑turning and related applications.

How does the CBN grade affect tool life?
CBN in the WBH20 grade resists abrasive wear and high temperatures, which extends tool life and maintains dimensional stability during prolonged cutting of hardened components.

Which geometry benefits are provided by the Rhombus 80° form?
The Rhombus 80° form offers flexible indexing positions and a robust cutting edge, improving stability across a range of turning operations and enabling repeatable performance.

Is the insert suitable for finishing operations?
Yes. The 0.8 mm corner radius and WBH20 grade support controlled cutting and consistent surface quality, making the insert appropriate for finishing and semi‑finishing of hard materials.

Does the negative 0° rake require special toolholders or machine settings?
Negative rake inserts are typically run with standard CNGA toolholders; however, optimising machine rigidity and cutting parameters is recommended to make the most of the stable cutting edge.

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

The Walter AG (brand appearance: Walter Tools) is one of the world’s leading manufacturers of precision tools for metalworking and forms part of the Sandvik Group. Protected trademarks and trade names are the property of their respective owners and are mentioned solely for explanatory purposes. There is no connection between our company and the named brands beyond the sale of original, factory‑new products of the manufacturer.