CNMA 120412 T5125 Wendeplatten - Tungaloy

Take advantage of the combination of a CVD-coated carbide grade optimised for cast iron, the 80° rhombic geometry and a 1.2 mm corner radius to secure stable performance in interrupted turning; order directly via Metav Werkzeuge or request advice from our technical consultants.

CNMA120412 T5125 Tungaloy indexable insert — 80° rhombic, 1.2 mm corner radius

The CNMA120412 T5125 is an ISO-standard indexable turning insert developed for external and internal turning, offering a tougher grade for interrupted cuts and less stable machining conditions.

• ISO-standard rhombic geometry 80°
• CVD-coated carbide grade T5125
• Optimised for interrupted cuts in cast iron
• Cylindrical hole for secure clamping

Stable cutting in interrupted turning for cast iron

The combination of a CVD-coated carbide substrate and the T5125 grade provides a tougher cutting edge that reduces chipping during interrupted cuts. The rhombic 80° geometry delivers a predictable cutting angle that balances strength and access to the workpiece, while the 1.2 mm corner radius increases edge robustness and contributes to consistent tool life. These characteristics translate into fewer insert changes and more continuous productive machining, particularly when turning cast iron where shock loads and vibration are common. The description is concise but grounded in measurable traits that support selection for demanding turning tasks.

System compatibility and quick tool change benefit

Compatibility is determined by the insert form, clearance angle, tolerance class, attachment method, size and thickness; the ISO designation ensures simple matching with standard external holders or boring bars. The CNMA120412 format with a cylindrical hole supports secure clamping on a wide range of clamping systems; a complete system typically comprises the ISO insert, a matching external holder or boring bar, a shim/clamping set and replacement screws. This system-oriented approach reduces setup time and simplifies spare part management, enabling predictable changeovers and minimised machine downtime.

Coating and material choices that extend service life

A CVD-coated carbide provides thermal and abrasive resistance while retaining core toughness, which is why the T5125 grade is specified for less stable conditions and interrupted operations. The coating supports higher surface speeds and improved wear resistance, which can lower overall tooling costs through extended insert life. Where surface finish and dimensional repeatability matter, the combination of geometry, coating and grade delivers a stable process window and repeatable results across shifts and operators.

Practical advantages for workshop productivity

Using an ISO-standard indexable insert simplifies inventory and training: toolholders and spare components follow the same matching rules, and the CNMA120412 T5125 insert integrates into existing turning tool families. The rhombic form provides flexibility for both external and internal turning, and the absence of a dedicated chipbreaker in this specification means the insert is best paired with process parameters and holder rigidity that support reliable chip evacuation. The result is a pragmatic balance between tool life, process stability and adaptability in everyday turning operations.

Contact Metav Werkzeuge for an order recommendation based on Tungaloy’s T5125 grade and the CNMA120412 format — our specialists can advise on holder selection and process parameters to match specific turning applications.

Technical Data

• Article number: 6850147
• Manufacturer SKU: TUN6850147
• Model series: ISO-Drehwendeschneidplatten

Facts

• Corner radius: 1.2 mm
• Insert angle: 80°
• Clearance (free) angle: 0°
• Plate thickness: 4.76 mm
• Plate size: 12 mm

Special features

• Material: carbide
• Coating / grade: T5125 (CVD-coated)
• Shape: rhombic
• Hole: with cylindrical hole
• Chipbreaker: none
• Application: turning; suitable for interrupted cuts and cast iron machining

FAQ

What materials is this insert best suited for?
The CNMA120412 T5125 indexable insert is specified for machining cast iron and performs well in interrupted cuts and less stable conditions due to the tougher T5125 grade.

How does the T5125 grade affect tool life?
Tungaloy’s T5125 CVD-coated carbide grade increases edge toughness and wear resistance, which typically extends insert life under shock-prone turning operations compared with more brittle grades.

Which holders are compatible with the CNMA120412 format?
Compatibility is ensured by ISO standards; the CNMA120412 insert fits ISO-matched external holders and boring bars that accept CNMA-shaped inserts and the stated thickness and hole style.

Is there a chipbreaker on this insert?
This specification is supplied without a chipbreaker; process stability and holder rigidity should be matched to ensure reliable chip control during turning.

What system components should be stocked alongside the insert?
Stocking matching external holders or boring bars, shims/clamping sets and replacement screws is recommended to enable rapid insert changes and consistent clamping.

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.