CNMA190612-RK5 WKK20S WKK20S Wendeplatten - Walter Tools

Take advantage of the combination of a wear-resistant Tiger·tec Silver grade, a chip-controlling RK5 geometry and an 80° rhombic form for reliable cast iron turning; order directly via Metav Werkzeuge or consult our specialists for process support.

CNMA190612-RK5 WKK20S indexable turning insert — Tiger·tec Silver grade for cast iron, Walter Tools

A CNMA190612-RK5 WKK20S turning insert designed for efficient machining of cast iron components, combining a robust coating technology with a dedicated chipbreaker and negative geometry for stable cutting conditions

• Tiger·tec Silver coating for wear resistance
• Optimised WKK20S grade for cast iron
• Rhombic 80° form for versatile turning
• RK5 chipbreaker for stable chip control

Improved process stability and longer tool life when machining cast iron

The Tiger·tec Silver metallurgical system and the WKK20S cutting grade are engineered for the abrasive nature of cast iron, offering significantly improved resistance to flank and crater wear. The coated cemented carbide substrate reduces abrasive damage from hard graphite phases, which directly extends tool life and lowers tool-change frequency. With a dedicated chip control geometry, the insert sustains consistent cutting forces that contribute to repeatable cycle times and reduced scrap rates.

Geometry that balances heavy material removal and surface integrity

The 80° rhombic form and the negative 0° clearance create a stable cutting edge for interrupted cuts and heavy engagement, while the 1.2 mm corner radius helps maintain surface quality under moderate feeds. The RK5 chipbreaker is tuned to the short, breaking chips typical of iron grades, improving evacuation and reducing the risk of built-up edge. These geometrical choices enable reliable roughing and effective semi-finishing without frequent tool readjustment.

Practical application notes and selection rationale for production shops

Selected for ISO group K, this insert is suitable when machining grey and malleable cast irons where abrasive wear and unpredictable chip formation are typical. The combination of a coated grade and robust geometry reduces downtime and improves process predictability — a rational choice for batch and contract manufacturers seeking consistent throughput. For fine-tuning speeds and feeds or integrating the insert into multi-op setups, Metav Werkzeuge can provide application data and optimisation tips to match machine capability and workpiece requirements.

For process-critical cast iron turning with Walter Tools quality, contact Metav Werkzeuge to discuss how the CNMA190612-RK5 WKK20S insert can improve cycle times and tool life — eMail info@metav-werkzeuge.com or call +49 2822 7131930

Technical data

• Article number: CNMA190612-RK5-WKK20S-WALTER
• Product type: Turning insert
• Series: Tiger·tec Silver
• Grade: WKK20S
• Manufacturer: Walter Tools

Core specifications

• Insert form: Rhombus 80°
• Size: 19 mm
• Thickness: 06
• Corner radius: 1.2 mm
• Clearance angle: 0° (negative)
• Chipbreaker: RK5
• Tolerance class: M

Features and applications

• Coating: Tiger·tec Silver (coated cemented carbide)
• Material suitability: cast iron (ISO group K)
• Geometry for interrupted cuts and heavy engagement
• Designed for stable chip control and reduced wear

FAQ

What materials is this insert intended for?
The CNMA190612-RK5 WKK20S insert is designed primarily for cast iron machining (ISO group K) using the Tiger·tec Silver coated grade.

How does the RK5 chipbreaker affect machining performance?
The RK5 chipbreaker provides controlled, short chips during cast iron turning, which improves evacuation, reduces edge loading and supports consistent cutting forces.

Can this insert be used for finishing passes?
Yes; the 1.2 mm corner radius and the coated grade allow effective semi-finishing. For mirror-like finishes, choose lower feed rates and appropriate cutting data.

What advantages does the Tiger·tec Silver coating offer?
Tiger·tec Silver enhances abrasive wear resistance and reduces flank wear on cast iron, extending tool life and stabilising process windows.

Is the negative 0° clearance suitable for heavy cuts?
A negative 0° clearance provides a robust cutting edge for interrupted cuts and heavier engagement, improving edge strength under demanding 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 are mentioned for explanation only; there is no connection between our company and the named brands. The offered article is original factory-new goods of the manufacturer Walter Tools.