CNMG 120408 GT720 Wendeplatten - Tungaloy

Take advantage of the combination of a GT720 cermet grade, ISO CNMG120408 geometry and a dependable fit for standard holders to secure consistent surface quality and predictable tool life; order via Metav Werkzeuge or consult our advisers for optimal grade and chipbreaker selection.

CNMG120408 GT720 — ISO CNMG turning insert, cermet finishing grade (Tungaloy)

CNMG120408 GT720 is an ISO-standard indexable insert for external and internal turning, optimised for finishing to light machining of steel where surface quality and dimensional control are priorities.

• ISO CNMG 120408 geometry
• GT720 cermet grade for finishing
• Rhombic form with 80° cutting angle
• Double-sided chipbreaker, with hole
• 0.8 mm corner radius

Precision finishing and longer tool life with GT720

The GT720 grade is a cermet design intended for finishing and light machining of steel, prioritising improved surface finish and consistent dimensional accuracy. Cermet combines ceramic and metallic properties to maintain a smooth cutting edge under low-to-moderate cutting forces, which reduces the tendency for material adhesion and micro-chipping. This results in more predictable wear behaviour and fewer rework cycles. For production runs that demand uniform part quality, the combination of the GT720 composition and the CNMG geometry supports reduced variability and enhanced process stability.

Easy integration into ISO tool systems and stable clamping

Compatibility with holder systems is defined by form, relief angle, tolerance class, fastening, size and thickness; the ISO format of this insert ensures straightforward mechanical fitment into standard external holders or boring bars. The plate is supplied in a rhombic format with a cylindrical hole for screw clamping and a nominal plate thickness of 4.76 mm, allowing secure engagement with underlay/shim and clamping kits. The insert’s double-sided chipbreaker design extends service life by offering two usable edges and supports simple indexation, while the 80° cutting angle and 0° relief specification deliver predictable cut geometry for both external and internal operations.

Application focus, material suitability and process benefits

Designed primarily for turning operations, the insert suits both external and internal turning where a superior surface and tight tolerances are required. The GT720 grade performs well in finishing passes on unalloyed and alloyed steel, providing stable edge condition and even wear across batches. Selecting the appropriate chipbreaker variant according to workpiece material and machine stability is advised to balance chip control and cutting forces. The system approach — indexable insert, matching holder or boring bar, underlay/clamp set and replacement screws — supports efficient maintenance routines and quick edge changes, enhancing shop-floor productivity and reducing machine downtime.

Choose the CNMG120408 GT720 insert from Tungaloy for consistent finishing performance and contact Metav Werkzeuge for application advice and procurement: info@metav-werkzeuge.com • +49 2822 7131930

Technical Data

• Article number: 6849277
• Manufacturer SKU: TUN6849277
• Model series: ISO turning indexable inserts

Core data

• Corner radius: 0.8 mm
• Plate thickness: 4.76 mm
• Size: 12 mm
• Cutting angle: 80°
• Relief angle: 0°
• Shape designation: CNMG120408

Special features

• Grade: GT720 (cermet)
• Schneidstofftyp: cermet / coated cermet
• Plate form: rhombic
• Hole style: cylindrical hole (with hole)
• Chipbreaker: double-sided
• Typical application: external and internal turning of steel
• System components: ISO insert, matching external holder or boring bar, underlay/clamping set, replacement screws

FAQ

What materials is this insert suitable for?
The CNMG120408 GT720 insert is designed for finishing to light machining of steel and is optimised for applications where surface quality and dimensional control are required.

How is the insert clamped and indexed?
Clamping is performed via the central cylindrical hole with a standard screw and shim/clamp set; the plate is double-sided, allowing indexation to the second cutting edge when required.

What does GT720 mean in practice?
GT720 denotes a cermet grade focused on achieving fine surface finishes and uniform wear in finishing operations on steel, offering a stable edge for repeatable results.

Is this insert compatible with standard CNMG holders?
Yes; the insert follows ISO CNMG120408 geometry, and compatibility depends on matching holder form, tolerance class, fastening and plate thickness.

How large is the corner radius and what effect does it have?
The corner radius is 0.8 mm, which supports improved surface integrity and dimension control during finishing cuts while moderating 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.