CNMG 120408 GT720 Wendeplatten - Tungaloy

The combination of a GT720 cermet grade and the CNMG geometry delivers high-quality surface finish and consistent wear for finishing and light turning operations; the rhombic form with a 0.8 mm corner radius and a cylindrical mounting hole ensures reliable clamping and straightforward integration into ISO-compatible holders — order the CNMG120408 GT720 Tungaloy turning insert through Metav Werkzeuge or request detailed application advice from our consultants.

CNMG 120408 GT720 Tungaloy indexable turning insert, finishing-grade

The CNMG120408 GT720 Tungaloy turning insert is an ISO-standard indexable insert designed for finishing to light turning of steel, offering a cermet-based grade optimised for surface integrity and dimensional stability.

• CNMG geometry with 80° included angle
• GT720 cermet for finishing and light machining
• Double-sided chipbreaker for consistent chip control
• 0.8 mm corner radius for fine surface finish

Achieve consistent finishing quality and dimensional control

The GT720 cermet grade is formulated for finishing to light machining, prioritising surface finish and dimensional accuracy. Cermet combines ceramic and metallic properties to produce a cutting edge that resists built-up edge and promotes a uniform wear pattern, which translates into stable part tolerances over longer runs. With the rhombic CNMG geometry and the modest 0.8 mm corner radius, the insert supports fine feed rates and reduced tool pressure, enabling improved surface integrity when machining steel components. Where process repeatability matters, selecting a finishing-grade cermet like GT720 reduces the need for frequent tool changes and secondary finishing work.

Stable chip control and secure clamping for uninterrupted production

A double-sided chipbreaker paired with the cylindrical mounting hole provides dependable chip formation and consistent clamping behaviour. The insert’s cylindrical hole and matched screw/clamp arrangements ensure repeatable seating in compatible holders, while the 0° relief configuration promotes minimal radial runout when the correct seat and tolerance class are used. This mechanical stability reduces vibration and helps maintain the quality advantages of the GT720 grade. For external and internal turning tasks, the indexable design allows unused cutting edges to be rotated into service, improving overall tool economy without sacrificing process stability.

Practical advantages for workshop efficiency and cost control

Using a double-sided CNMG insert lowers tooling cost per edge and simplifies inventory management compared with single-sided alternatives. The carbide substrate provides wear resistance appropriate for finishing operations, and the relatively thick 4.76 mm body contributes to insert rigidity and secure clamping. In practice, this results in fewer interruptions for insert changes and more consistent batch quality. The ISO-standard format eases sourcing of replacement inserts and compatible holders, enabling efficient integration into existing turning tool systems and faster setup times on the shop floor.

Clear selection criteria and installation guidance

Compatibility depends on matching the insert’s form, relief angle, tolerance class, clamping type, size and thickness to the chosen holder. The CNMG120408 geometry requires an ISO-compatible holder designed for rhombic CNMG plates and screw/clamp fixation that aligns with the 4.76 mm thickness and 12 mm inscribed circle. When selecting the best chipbreaker and grade, consider stock material, stability of the setup and desired surface finish—GT720 is recommended where fine finish and steady wear are priorities. For unfamiliar applications or borderline cases, discuss the machining scenario so the holder, seat and cutting parameters can be verified before production.

Contact Metav Werkzeuge for application-specific recommendations and to order genuine Tungaloy CNMG120408 GT720 turning inserts; email info@metav-werkzeuge.com or call +49 2822 7131930 for rapid assistance

Technical data

• Article number: 6851479
• Manufacturer SKU: TUN6851479
• Label: CNMG120408 GT720 Tungaloy-Wendeplatte
• Model series: ISO-Drehwendeschneidplatten
• Type designation: CNMG120408
• Manufacturer article number: 6851479

Facts

• Inscribed circle / size: 12 mm
• Thickness: 4.76 mm
• Corner radius: 0.8 mm
• Included angle: 80°
• Relief angle: 0°

Special features

• Material: Hartmetall
• Grade: GT720 (cermet / coated cermet)
• Plate form: rhombic
• Chipbreaker: double-sided
• Mounting: with cylindrical hole
• Typical application: turning (external and internal)
• System notes: ISO indexable insert, compatible with matching holder, seat and clamping components

FAQ

What materials is this insert intended for?
The GT720 grade is intended primarily for finishing to light machining of steel; the CNMG120408 GT720 Tungaloy insert provides enhanced surface quality and controlled wear during such operations.

How is the insert clamped in the toolholder?
The CNMG120408 insert features a cylindrical centre hole for screw or clamp fixation; secure clamping in an ISO-compatible holder is required to exploit the GT720 grade’s performance.

Can the CNMG120408 GT720 be used for internal turning?
Yes, the geometry and chip control characteristics of this Tungaloy insert make it suitable for both external and internal turning when the correct holder and reach are selected.

How many usable cutting edges are available per insert?
This double-sided CNMG indexable insert provides multiple edges through rotation; the exact number depends on the insert indexing pattern and whether both sides are used in the chosen clamping arrangement.

What are the key benefits of the GT720 cermet grade?
GT720 cermet offers improved surface finish, even wear behaviour and is optimised for finishing and light-turning applications on steel, reducing the need for secondary finishing and improving dimensional repeatability.

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.