CNMG 120412 AH6225 Wendeplatten - Tungaloy

Take advantage of a universal PVD-coated carbide grade that balances a sharp, stable cutting edge with broad applicability for medium turning operations; its ISO geometry and precise dimensions ensure predictable cycle times and easy toolholder compatibility. Order directly via Metav Werkzeuge or consult our specialists for process matching and availability.

CNMG120412 120412 AH6225 Tungaloy turning insert – PVD-coated carbide, 1.2 mm nose radius

CNMG120412 AH6225 is an ISO rhombic turning insert designed for external and internal turning, optimised for medium cutting conditions and varying workpiece stability.

• Universal grade for stainless steels
• PVD-coated carbide for edge stability
• Rhombic CNMG with 80° cutting angle
• 1.2 mm nose radius for consistent finishes

Consistent medium-turning performance with predictable tool life

The AH6225 PVD-coated carbide grade delivers a controlled combination of sharpness and resilience suited to medium turning of austenitic and other stainless steels. The geometry chosen—an ISO CNMG rhombic insert with an 80° approach—provides a reliable shear plane and good tool engagement, which reduces chatter risk and improves surface integrity. With a 1.2 mm nose radius, the insert balances strength and finish, enabling stable material removal rates while maintaining an acceptable surface roughness for subsequent operations.

Compatibility and mounting — designed for straightforward integration

Being an ISO-standard insert, compatibility with holders depends on form, clearance angle, tolerance class, fastening method, size and thickness. This insert features a 4.76 mm plate thickness and a cylindrical hole for positive seating and repeatable clamping. The double-sided construction maximises indexable life per insert, and the standardised dimensions permit quick replacement in conventional CNMG holders and boring bars, reducing downtime and simplifying inventory management.

Practical benefits of the AH6225 grade in varied conditions

The PVD-layered substrate promotes stable edge retention across changing cut conditions, giving a favourable cost-to-life ratio for shops processing mixed batches. The double-sided chipbreaker arrangement supports chip control in both external and internal turning, which lowers the risk of rework caused by poorly evacuated swarf. For applications involving interrupted cuts or variable feed, the balanced edge geometry enhances robustness without compromising cutting efficiency.

Choosing the right insert for the job

Select the insert when machining medium feeds on stainless steels where a combination of repeatable surface finish and tool longevity is required. Match the grade and chipbreaker to the workpiece alloy and machine rigidity: softer, ductile alloys benefit from the sharpness of this PVD-coated grade, while tougher conditions may call for reduced cutting depths and optimised feeds to preserve edge life. The indexable design supports rapid rotation of cutting edges, helping to maintain production flow.

For availability or process recommendation for the AH6225 grade, contact Metav Werkzeuge for technical consultation and delivery details at info@metav-werkzeuge.com or by phone on +49 2822 7131930

Technical data

• Article number: 6946904
• Manufacturer SKU: TUN6946904
• Model series: ISO turning inserts
• Designation: CNMG120412 AH6225 Tungaloy insert
• Material: cemented carbide
• Coating/grade: PVD, AH6225
• Hole style: cylindrical hole
• Chipbreaker: double-sided

Core measurements

• Insert size: 12 mm
• Thickness: 4.76 mm
• Nose radius: 1.2 mm
• Cutting angle: 80°
• Clearance angle: 0°

Features and materials

• ISO rhombic plate form
• Double-sided indexable design
• Universal application for stainless steels
• Suitable for external and internal turning
• Compatible with standard CNMG holders and boring bars

FAQ

What materials is this insert intended for?
The CNMG120412 AH6225 insert is formulated as a universal grade for machining stainless steels and is suitable for a wide range of austenitic and similar alloys.

How does the AH6225 coating affect tool life?
The PVD coating on the AH6225 grade enhances edge stability and wear resistance, delivering more consistent tool life under medium cutting conditions.

Which toolholders are compatible with this insert?
ISO CNMG holders and standard boring bars that accept a CNMG120412 geometry and 4.76 mm thickness will be compatible; correct seating depends on form, tolerance and fastening.

Can the insert be used for internal turning?
Yes, the rhombic geometry and double-sided chipbreaker make the insert suitable for both external and internal turning applications.

What is the advantage of the 1.2 mm nose radius?
A 1.2 mm radius offers a compromise between edge strength and surface finish, providing improved stability in medium turning while producing a consistent workpiece surface.

Manufacturer/Responsible: Tungaloy-NTK Germany GmbH, Katzbergstraße 3a, 40764 Langenfeld - Protected trademarks and product names are the property of their respective owners. Brand names and protected trademarks are mentioned solely for explanatory purposes. There is no affiliation between our company and the mentioned brands. The item offered is an original, brand-new product from the manufacturer.