CNMG 120408 GT720 Wendeplatten - Tungaloy

Take advantage of the combination of precision finishing, stable chip control, and ISO‑compatible geometry to improve process reliability and surface quality in turning operations; order the insert directly via Metav Werkzeuge or request advice from their consultants.

CNMG120408 GT720 CNMG 120408 turning insert by Tungaloy — Cermet finishing grade with 0.8 mm radius

The CNMG120408 GT720 Tungaloy insert is an ISO‑standard rhombic turning insert engineered for finishing and light turning of steel, prioritising surface quality and dimensional accuracy.

• Cermet grade GT720 for fine finishing
• ISO‑standard CNMG 120408 geometry
• 0.8 mm corner radius for precise edges
• Double‑sided chipbreaker for stable chips

High‑precision finishing for consistent surface quality

The combination of a cermet substrate and the GT720 grade targets finishing to light machining of steel, delivering improved surface finish and consistent dimensional control. The fine microstructure of the grade promotes uniform wear, which helps to preserve the programmed tolerances over longer tool life. In practical terms, that means fewer rework cycles and more predictable part quality during serial production. Explanation of terms: cermet denotes a ceramic‑metal composite optimised here for low abrasion and stable cutting at finishing feeds and speeds.

ISO compatibility and secure clamping for reliable setup

Designed to ISO geometry, the insert’s CNMG120408 designation ensures compatibility with matching external holders and boring bars when form, clearance, tolerance class, fastening method, size and thickness are respected. The rhombic plate shape and cylindrical hole allow a positive, repeatable clamp engagement; the double‑sided chipbreaker gives two usable cutting edges and supports stable chip formation across varying cutting conditions. The 0° relief paired with an 80° approach angle yields predictable cutting forces and helps to maintain tool life when switching between finishing and light semi‑finishing operations.

Process reliability, material suitability and shopfloor benefits

The insert is specified for turning applications on steel where dimensional accuracy and surface integrity matter most. Carbide‑based construction provides the necessary edge stability for finishing passes, while the grade’s wear characteristics reduce the risk of sudden edge failure. For production environments, this translates to fewer interruptions, consistent cycle times and improved first‑pass yield. For parameter selection, pair the plate with a holder suited to the CNMG form and choose a chipbreaker and grade aligned with the workpiece material and machining stability. Technical consultation is recommended for optimising speeds and feeds for specific machines and material batches.

For technical samples, parameter recommendations or procurement, contact Metav Werkzeuge — Metav Werkzeuge can advise on holder compatibility and machining parameters and can be reached at info@metav-werkzeuge.com or by phone on +49 2822 7131930

Technical data

• Article number: 6849430
• Manufacturer SKU: TUN6849430
• Model series: ISO‑Drehwendeschneidplatten
• Designation: CNMG120408 GT720
• Material: Carbide (cermet / coated cermet)

Facts

• Angle: 80°
• Corner radius: 0.8 mm
• Relief angle: 0°
• Plate thickness: 4.76 mm
• Size: 12 mm
• With hole: cylindrical hole

Special features

• Double‑sided chipbreaker
• Rhombic plate shape
• ISO‑standard CNMG geometry
• Intended application: Turning (finishing to light machining)
• Grade: GT720 (cermet)
• Suitable for steel machining

FAQ

What steels is the insert suited for?
The CNMG120408 GT720 insert is specified primarily for steel machining, with the GT720 cermet grade optimised for finishing and light machining of typical steel alloys.

How is the insert clamped in the holder?
Clamping requires a matching ISO CNMG holder; the rhombic form and cylindrical hole ensure repeatable seating and secure fastening for reliable performance.

Can the insert be rotated or indexed to use the second cutting edge?
Yes, the insert is double‑sided with a chipbreaker on both sides, allowing indexing to a fresh edge to extend effective tool life.

Which toolholder characteristics must be checked for compatibility?
Compatibility depends on form, corner radius, relief angle, tolerance class, fastening method, size and plate thickness; verify these parameters against the holder specification before mounting.

Is this insert suitable for semi‑finishing cuts as well as finishing?
The GT720 grade is intended for finishing to light machining; it may be used for light semi‑finishing where stability and surface quality remain priorities.

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.