CNMG120412-MK5 WKK20S WKK20S Wendeplatten - Walter Tools

Take advantage of the combination of long tool life, consistent chip control and reliable performance for efficient machining of cast iron components. Order the insert directly via Metav Werkzeuge or contact the technical team for application advice.

CNMG120412-MK5 WKK20S — Indexable Turning Insert, Rhombic 80°, for Cast Iron — Walter Tools

The CNMG120412-MK5 WKK20S is a negative 0° rhombic insert optimised for roughing and medium turning in cast iron applications.

• Tiger·tec Silver coating extends tool life
• Optimised for abrasive cast-iron machining
• Rhombic 80° geometry for versatile turning
• 1.2 mm corner radius for robust performance

Exceptional productivity for cast-iron turning

The Tiger·tec Silver grade WKK20S combines a coated carbide substrate with a protective multilayer to resist abrasive wear encountered in grey and nodular cast irons. This results in a reduced rate of flank wear and a longer effective life per edge, which lowers the overall cost per component and increases process uptime. The MK5 chipbreaker helps produce short, predictable chips, reducing the risk of entanglement and improving reliability in unattended cycles.

Stable cutting and part-quality benefits

The Rhombic 80° shape and the 1.2 mm corner radius deliver a stable cutting edge that tolerates higher cutting forces without losing edge integrity. For customers seeking consistent surface finish and dimensional stability, the geometry supports conservative flank contact and smooth engagement, which can improve repeatability on medium-to-heavy interrupted cuts. The negative 0° rake contributes to robust edge strength and predictable tool behaviour when machining abrasive workpieces.

Practical application guidance and process assurance

This insert is specifically tailored for ISO group K (cast iron) and is suitable for conventional turning operations where abrasive wear dominates. The coated grade and chipforming design aim to simplify parameter selection: higher cutting speeds with appropriate feed rates will exploit the coating’s thermal stability, while the MK5 chip control minimises secondary operations related to chip management. If there is any uncertainty about cutting data or machine setup, Metav Werkzeuge’s technical advisory can assist with recommended parameters and process correlation.

Contact Metav Werkzeuge for tailored application support or to order this Walter Tools Tiger·tec Silver insert; call +49 2822 7131930 or email info@metav-werkzeuge.com

Technical data

• SKU: CNMG120412-MK5-WKK20S-WALTER
• Designation: CNMG120412-MK5 WKK20S
• Manufacturer: Walter Tools

Core specifications

• Insert shape: Rhombus 80°
• Relief / rake: 0° (negative)
• Corner radius: 1.2 mm
• Insert size: 12
• Thickness: 04
• Chipbreaker: MK5
• Grade / series: WKK20S, Tiger·tec Silver
• Tolerance class: M

Materials & features

• Coating: Tiger·tec Silver
• Substrate: coated carbide (WKK20S)
• Application: suitable for cast iron (ISO group K)
• Design: negative geometry, robust edge for interrupted cuts

FAQ

What workpiece materials is this insert designed for?
The CNMG120412-MK5 WKK20S insert is designed for machining cast iron (ISO group K), with a grade and chipformer optimised for abrasive grey and nodular cast irons.

How does the Tiger·tec Silver coating benefit machining?
Tiger·tec Silver reduces abrasive flank wear and improves thermal resistance, allowing longer edge life and the possibility of higher cutting speeds compared with uncoated grades.

Which chip control can be expected with the MK5 chipbreaker?
The MK5 chipbreaker produces short, controllable chips in cast-iron turning, enhancing safety and reducing the need for secondary chip handling.

Is this insert suitable for interrupted cuts?
Yes, the negative 0° geometry and 1.2 mm corner radius provide increased edge strength and stability, making it suitable for interrupted and heavy roughing operations.

Can Metav Werkzeuge provide cutting data for this insert?
Metav Werkzeuge offers technical advice and recommended cutting parameters for the CNMG120412-MK5 WKK20S to match machine and workpiece conditions.

Manufacturer/Responsible: Walter Deutschland GmbH, Derendinger Straße 53, 72072 Tübingen

Protected trademarks and trade names are the property of their respective owners. Brand names and protected trade names are mentioned for explanatory purposes only. There is no connection between our company and the named brands. The offered article is original, factory-new merchandise of the manufacturer (Walter Tools).