CNMA190616-RK7 WKK20S WKK20S Wendeplatten - Walter Tools

Take advantage of the combination of Tiger·tec Silver wear resistance and the RK7 chipformer to secure stable, productive machining of cast iron; order directly via Metav Werkzeuge or request tailored application advice from our consultants.

CNMA190616-RK7 WKK20S indexable turning insert — rhombic 80° for cast iron, Tiger·tec Silver, Walter Tools

The CNMA190616-RK7 WKK20S is a rhombic 80° indexable turning insert optimised for productive cast iron machining, featuring a Tiger·tec Silver coating and an RK7 chipformer for reliable chip control.

• Tiger·tec Silver coating for high wear resistance
• Optimised chip former RK7 for short chips
• Rhombic 80° geometry with 0° negative rake
• Designed for cast iron machining (ISO K)

Durable grade and coating for abrasive cast iron turning

The coated carbide grade WKK20S from the Tiger·tec Silver series is formulated for the abrasive nature of cast iron, combining a hard, wear‑resistant surface with a ductile substrate. This balance reduces flank and crater wear under the intermittent chip conditions common when turning grey and nodular cast irons. The result is increased tool life and more predictable tool change intervals, which supports continuous production and lowers overall machining costs. The technical composition is especially suited where short, brittle chips occur frequently and where stable chip formation is essential.

Geometry and chip control that stabilise the cut

The insert’s rhombic 80° form and 0° negative rake ensure robust cutting edge support and low cutting forces in interrupted cuts. The integrated RK7 chipformer promotes short, manageable chips that evacuate cleanly from the cutting zone, reducing the risk of entanglement and machine downtime. A corner radius of 1.6 mm increases edge strength and contributes to surface finish consistency in roughing and semi‑finishing operations. Together these geometric features enhance process reliability and allow higher uninterrupted cutting depths when compared with less specialised grades.

Process benefits and workshop integration

Designed as an indexable insert for standard turning toolholders, this grade offers simple seat interchangeability and repeatable clamping accuracy. The tolerance class M ensures consistent dimensional performance across batches, supporting predictable setup and minimising inspection effort. For production environments the combination of coating, geometry and chip control translates into fewer tool changes and steadier cycle times. Machine shops specialising in cast iron components will appreciate the practical balance between wear resistance and edge robustness that supports both roughing and throughput‑oriented finishing.

Contact Metav Werkzeuge for application advice and to request the Walter Tools CNMA190616-RK7 WKK20S for reliable cast iron turning; eMail: info@metav-werkzeuge.com — Tel: +49 2822 7131930

Technical Data

• Article number: CNMA190616-RK7-WKK20S-WALTER
• Name: CNMA190616-RK7 WKK20S
• Type: indexable turning insert
• Manufacturer: Walter Tools
• Series: Tiger·tec Silver
• Grade: WKK20S
• Execution: A

Core Data

• Plate form: Rhombic 80°
• Plate size: 19
• Corner radius: 1.6
• Plate thickness: 06
• Free cutting angle: 0° (negative)
• Chipformer: RK7
• Tolerance class: M

Special features

• Coating: Tiger·tec Silver (coated carbide)
• Material application: cast iron (ISO K)
• Short-chip performance
• Robust cutting edge for interrupted cuts

FAQ

What materials is this insert intended for?
The CNMA190616-RK7 WKK20S is formulated primarily for machining cast iron (ISO K) and is optimised for the abrasive and short‑chip characteristics of these materials.

How does the RK7 chipformer affect chip control?
The RK7 chipformer shapes chips into short segments for safer evacuation; with the CNMA190616-RK7 WKK20S this reduces chip entanglement and supports steady production.

Is this insert suitable for finishing passes?
Yes — the combination of a 1.6 mm corner radius and the Tiger·tec Silver coating provides edge stability and surface finish potential suitable for semi‑finishing and certain finishing operations on cast iron.

What benefit does the Tiger·tec Silver coating provide?
Tiger·tec Silver increases wear resistance while maintaining edge toughness, which lengthens tool life under abrasive cast iron conditions and stabilises process reliability.

Are these inserts compatible with standard toolholders?
The rhombic 80° form and ISO designation make the insert compatible with common turning toolholders designed for CNMA‑style indexable inserts.

Protected trademarks and trade names lie in the rights of their respective owners. Brand names and protected trade designations are mentioned solely for explanatory purposes. There is no connection between our company and the named brands. The offered article is an original, factory‑new product of the manufacturer.

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