CNMA120416-RK7 WKK20S WKK20S Wendeplatten - Walter Tools

Take advantage of the combination of Tiger·tec Silver coating and the RK7 chipbreaker for reliable chip control and long tool life; the insert’s negative 0° rake and Rhombus 80° geometry support consistent turning of cast iron components. Order the insert directly via Metav Werkzeuge or consult the Metav team for application-specific advice.

CNMA120416-RK7 WKK20S indexable turning insert, negative 0° rake, Tiger·tec Silver by Walter Tools

The CNMA120416-RK7 WKK20S is a Rhombic 80° indexable turning insert designed for productive machining of cast iron with a Tiger·tec Silver coated, wear-resistant carbide grade.

• Tiger·tec Silver coating for abrasive wear resistance
• RK7 chipbreaker tuned for short, breaking chips
• Negative 0° rake for stable cutting forces
• Rhombus 80° shape for versatile turning operations

Stable chip control reduces interruptions and boosts productivity

The combination of the RK7 chipbreaker and the Tiger·tec Silver coating provides consistently short, broken chips when machining cast iron, which reduces the risk of chip entanglement and tool interference. This behaviour translates into fewer stoppages for chip clearing and safer automated operation. The insert’s engineered chip geometry is especially beneficial in production environments where repeatability and uptime are essential, as reliable chip breakage contributes directly to process stability and lower cycle-time variability.

Accurate geometry for predictable cutting and surface quality

A Rhombus 80° outline with a 1.6 mm corner radius and a negative 0° rake ensures robust edge support and a predictable cutting edge engagement. The coated carbide grade WKK20S is tuned for abrasive cast iron applications, balancing wear resistance with sufficient toughness to withstand interrupted cuts. Together, these features produce consistent surface finish and dimensional stability, making the insert suitable for both semi-finish and finish turning where component tolerances and appearance matter.

Economical performance through wear resistance and process security

The Tiger·tec Silver technology enhances thermal and abrasive resistance, which prolongs the effective cutting life of the insert under typical cast iron loads. Reduced flank wear and steadier tool life lower tooling costs per part and minimise regrinding or insert exchanges. In practice, shops see improved batch-to-batch consistency and a reduction in scrap rates when using coated grades that are matched to the workpiece material. The construction and coating strategy of this grade aim to deliver predictable performance in medium- to high-volume turning operations.

Contact Metav Werkzeuge for application advice, cutting data recommendations and fast delivery of Walter Tools Tiger·tec Silver CNMA120416-RK7 WKK20S inserts

Technical Data

• SKU: CNMA120416-RK7-WKK20S-WALTER
• Designation: CNMA120416-RK7 WKK20S
• Product type: indexable turning insert
• Series: Tiger·tec Silver
• Grade: WKK20S
• Manufacturer: Walter Tools
• Tolerance class: M
• Execution: A
• Chipbreaker: RK7

Facts

• Insert shape: Rhombus 80°
• Corner radius: 1.6 mm
• Rake angle: 0° (negative)
• Size: 12
• Thickness: 04
• Material code: K
• Cast iron application: yes

Special features

• Coating technology: Tiger·tec Silver
• Carbide: coated cemented carbide
• Suitable material group: cast iron
• Optimised for abrasive wear and breaking chips
• Stable cutting edge for interrupted cuts

FAQ

What materials is this insert intended for?
The insert is designed primarily for machining cast iron; the WKK20S grade and RK7 chipbreaker are optimised for abrasive grey and nodular cast iron behaviour.

Which chipbreaker is fitted and what is its benefit?
The RK7 chipbreaker delivers short, broken chips during turning, improving chip evacuation and reducing the likelihood of chip-related interruptions.

How does the Tiger·tec Silver coating affect tool life?
The Tiger·tec Silver coating increases resistance to abrasive wear and thermal loads, which typically extends the tool life of the insert in cast iron applications.

Is the insert geometry suitable for finishing operations?
Yes, the Rhombus 80° shape and 1.6 mm corner radius provide edge stability and control required for semi-finish to finish turning, delivering consistent surface quality.

Can this insert cope with interrupted cuts?
The negative 0° rake and robust coated carbide grade offer good edge support under interrupted cutting conditions, improving process security.

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

Protected trademarks and trade names are the property of their respective owners. Brand names and registered trademarks are mentioned for explanation only; no connection between our company and the named brands is implied. The offered article is an original, factory-new product of the manufacturer.