CNMG 120412 AH6225 Wendeplatten - Tungaloy

Take advantage of the combination of a PVD-coated cemented carbide grade optimised for stainless steels, a stable 80° rhombic geometry and a reliably sharp cutting edge for consistent turning performance. Order the inserts directly via Metav Werkzeuge or contact the consultants for machining advice.

CNMG 120412 AH6225 indexable insert for turning — Tungaloy

The CNMG 120412 AH6225 indexable insert is a rhombic, ISO‑standard insert designed for external and internal turning operations where a stable, sharp cutting edge and good chip control are required

• PVD-coated carbide AH6225
• Optimised for stainless steels
• 80° rhombic geometry
• Double-sided chipbreaker, 1.2 mm radius

Consistent cutting performance under variable conditions

The CNMG‑style insert combines a PVD-coated carbide substrate with the AH6225 grade to deliver a balance of edge sharpness and wear resistance for medium turning operations. The PVD coating reduces built-up edge and improves surface finish when machining stainless steels, while the substrate maintains toughness under intermittent cuts. In practice this means fewer insert changes and a more predictable tool life, supporting higher uptime and consistent component quality.

Easy integration into ISO tool systems and secure clamping

The rhombic 80° form and standard ISO dimensions ensure compatibility with a wide range of external holders and boring bars. Compatibility is determined by insert form, relief angle, tolerance class, fixation method, size and thickness, so the insert slots into typical ISO turning tool systems without special adapters. The version supplied has a cylindrical locating hole, enabling secure seating and repeatable positioning in the pocket, which simplifies tool set‑up and reduces indexing errors.

Reliable chip control and component surface quality

A double-sided chipbreaker optimised for a range of feed rates helps to fragment chips and direct them away from the workpiece, improving process reliability and surface condition. The 1.2 mm corner radius contributes to a robust cutting edge that balances strength and finish: a small radius improves edge stability and reduces vibration for medium cuts, while still producing an even surface on turned parts.

Practical benefits for production and process optimisation

Selecting a universal grade such as AH6225 offers broad material coverage and reduces the need for multiple grades in mixed‑material production runs. The insert supports process standardisation: fewer tool variations in the tool crib, simpler inventory management and predictable reconditioning schedules. For shops machining stainless steels, the combination of coating, geometry and chipbreaker delivers tangible improvements in throughput and repeatability.

Contact Metav Werkzeuge for application advice, availability and to request a machining recommendation for Tungaloy CNMG inserts — eMail info@metav-werkzeuge.com or call +49 2822 7131930

Technical data

• Article number: 6824983-Tungaloy
• Manufacturer article number: 6824983
• Model series: ISO turning indexable inserts
• SKU: TUN6824983
• Material: cemented carbide
• Coating: PVD, grade AH6225

Core data

• Insert designation: CNMG120412
• Inscribed circle / size: 12
• Thickness: 4.76 mm
• Corner radius: 1.2 mm
• Relief angle: 0°
• Geometry angle: 80°

Special features

• Rhombic insert shape (80°)
• Double-sided chipbreaker
• Cylindrical locating hole
• Suited for external and internal turning
• Intended for machining stainless steels
• PVD-coated cutting grade for medium cutting conditions

FAQ

What materials is this insert suitable for?
The CNMG 120412 AH6225 indexable insert from Tungaloy is optimised for stainless steels and performs well in medium turning applications where a sharp, stable edge is required.

Is the insert compatible with standard ISO turning holders?
Yes; the CNMG120412 follows ISO form and dimensions and is compatible with holders designed for 80° rhombic inserts, provided the holder matches the insert thickness, size and fixing method.

How does the AH6225 grade affect tool life?
The AH6225 PVD-coated grade offers a balance between edge sharpness and wear resistance, giving predictable tool life under variable conditions and improved resistance to built‑up edge when machining stainless steels.

Can the insert be indexed to use both sides?
This is a double‑sided insert with a chipbreaker on both faces, allowing indexing to present a fresh edge and extend the useful life of each insert.

What is the corner radius and how does it influence machining?
The insert has a 1.2 mm corner radius, which enhances edge strength and helps maintain surface quality during medium turning operations without excessive cutting forces.

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.