CNGA120408TM-4 WBH20C WBH20C Wendeplatten - Walter Tools

Take advantage of the CBN-grade wear resistance, the rhombic 80° geometry and the 0.8 mm corner radius to ensure stable hard-turning performance and predictable tool life; order the insert directly via Metav Werkzeuge or contact the consultants for application advice.

CNGA120408TM-4 WBH20C turning insert — Walter Tools, CBN grade for hard turning (rhombic 80°, 0.8 mm radius)

CNGA120408TM-4 WBH20C is a rhombic turning insert designed for hard machining applications, combining a coated CBN grade with a negative relief angle for secure cutting in hardened steels.

• CBN grade WBH20C for hard turning
• Rhombic 80° insert geometry
• Corner radius 0.8 mm
• Negative relief angle 0° (stable cutting)

Predictable wear resistance for hardened steels

The coated CBN grade WBH20C is formulated for high-wear operations, making it particularly suitable for machining hardened steels and similar hard materials. The combination of a CBN cutting edge and a controlled chip former delivers high resistance to abrasive wear, which reduces the frequency of insert changes and supports continuous production. This results in lower downtime and more reliable cycle times in series turning operations, providing a clear rational advantage for process planners and production managers.

Geometry engineered for consistent cutting behaviour

The rhombic 80° shape with a 0.8 mm corner radius and a 0° negative relief angle offers a balance between edge strength and cutting stability. The geometry reduces impact on the cutting edge during interrupted cuts while maintaining a predictable cutting direction and surface finish. For operators, this means improved repeatability in diameters and profiles and fewer adjustments between components — a practical benefit that supports efficient programming and reduces scrap rates.

Process security and productivity through chip control

Equipped with a defined chipbreaker (code 4) and a tolerance classification of G, the insert supports controlled chip formation and consistent seat fitment in toolholders. The chip control features improve swarf evacuation and protect the cutting edge from re-cutting, which enhances tool life and surface integrity. These technical characteristics translate into measurable productivity gains, especially in medium- to high-volume production where stable output and low scrap are critical.

Application scenarios and service guidance

This insert is intended primarily for hard turning tasks, including finishing and semi-finishing of hardened steels and pre-hardened steels where a wear-resistant CBN edge is required. The robust design supports use in automated lathes and CNC turning centres under stable clamping conditions. For support on selection, toolholder pairing or recommended cutting parameters, Metav Werkzeuge’s technical advisors can provide targeted recommendations to match the machining strategy and maximise process efficiency.

Contact Metav Werkzeuge for availability of Walter Tools CBN inserts and expert advice on integrating the CNGA120408TM-4 WBH20C into production; email info@metav-werkzeuge.com or call +49 2822 7131930

Technical Data

• Article number: CNGA120408TM-4-WBH20C-WALTER
• ISO designation: CNGA120408TM-4 WBH20C
• Series: Walter CBN / Hartstoff

Data

• Size: 12
• Thickness code: 04
• Corner radius: 0.8 mm
• Relief angle: 0° (negative)
• Chipbreaker: 4
• Tolerance class: G

Special features

• Coated CBN grade WBH20C
• For hardened steels (H)
• Rhombic insert 80°
• Series: Walter CBN / Hartstoff

FAQ

What materials is this insert suitable for?
The CNGA120408TM-4 WBH20C insert is specified for hardened steels and pre-hardened steel applications; its CBN grade is optimised for high-wear, hard machining tasks.

Can the insert be used for finishing and semi-finishing?
Yes — the combination of the rhombic 80° geometry and the 0.8 mm corner radius supports both finishing and semi-finishing passes with controlled edge strength.

What does the chipbreaker code 4 indicate?
Chipbreaker code 4 denotes a chip control geometry designed to produce short, manageable chips under the recommended cutting conditions, improving process security.

Is the negative relief angle significant for toolholders?
The 0° negative relief angle increases edge support and requires compatible toolholder clamping; correct seating according to the holder manufacturer’s instructions ensures repeatable performance.

Where can one get cutting data and application advice?
Metav Werkzeuge provides application guidance for the Walter Tools CNGA120408TM-4 WBH20C insert; their consultants can advise on cutting speeds, feeds and holder selection for specific setups.

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

Protected trademarks and trade names are the property of their respective owners. Brand names and protected trademarks are mentioned for explanation only. There is no connection between our company and the named brands. The item offered is an original, factory-new product of Walter Tools.