CNMA120412-RK5 WKK20S WKK20S Wendeplatten - Walter Tools

Take advantage of the combination of Tiger·tec Silver coating, an RK5 chipbreaker and a rhombic 80° form for reliable, high‑throughput turning of cast iron; order directly via Metav Werkzeuge or ask the consultants for application support.

CNMA120412-RK5 WKK20S indexable turning insert — Walter Tools, Tiger·tec Silver, for cast iron

The CNMA120412-RK5 WKK20S is a rhombic 80° indexable turning insert designed for productive machining of cast iron components with a 0° negative rake and a 1.2 mm corner radius

• Tiger·tec Silver coating for abrasive wear resistance
• Optimised for cast iron (ISO group K)
• RK5 chipbreaker for controlled, short chips
• Rhombic 80° geometry with 1.2 mm corner radius

Higher throughput on abrasive cast iron with stable tool life

The coated carbide grade of the WKK20S series combines a wear‑resistant Tiger·tec Silver surface with a substrate formulated for abrasive cast iron machining. This results in consistent cutting performance and extended tool life in interrupted cuts and heavy roughing cycles. By pairing the RK5 chipbreaker with the rhombic geometry, the insert produces predominantly short, controlled chips that reduce downtime for chip clearing and allow higher feed rates without sacrificing surface quality.

Reliable chip control and secure cutting edge for process stability

A stable machining process is achieved through the tailored chipformer and the 0° negative rake that help dampen vibration and protect the cutting edge during tough engagements. The combination of geometry and chipbreaker increases repeatability across batches, translating into fewer rejects and predictable cycle times. For shops aiming to improve first‑pass yield, this insert delivers measurable gains in process security and part consistency.

Practical benefits that reduce machining costs

The insert’s design focuses on economy in serial production: fewer tool changes, reduced regrinding and less machine idle time. The rhombic 80° shape and 1.2 mm corner radius provide a versatile cutting profile for both roughing and semi‑finishing passes, reducing assortment complexity. Where abrasiveness and short, brittle chips are encountered, this grade provides a cost‑effective balance of wear resistance and fracture toughness, helping to lower overall cost per component.

Compatibility and mounting considerations for straightforward integration

The ISO designation and seat code align with common toolholder systems, enabling straightforward replacement in standard CNMA pockets. The insert is marked with its CNMA120412-RK5 base designation and the WKK20S grade for unambiguous identification during tool set‑up. When integrating into a production line, confirm holder clearance for rhombic 80° inserts and the recommended clamping torque to retain consistent orientation and repeatability.

Contact Metav Werkzeuge for tailored application advice on Walter Tools Tiger·tec Silver turning inserts — reach us at info@metav-werkzeuge.com or call +49 2822 7131930 to discuss availability and suitability for specific cast iron grades

Technical data

• Article number: CNMA120412-RK5-WKK20S-WALTER
• SKU/UID: CNMA120412-RK5-WKK20S-WALTER
• Product type: Drehwendeschneidplatte / indexable turning insert
• Manufacturer: Walter Tools

Facts

• Insert designation: CNMA120412-RK5 WKK20S
• Series: Tiger·tec Silver
• Material group: K (cast iron)
• Free angle: 0° (negative)
• Corner radius: 1.2 mm
• Insert shape: Rhombic 80°
• Size: 12
• Thickness code: 04
• Chipbreaker: RK5
• Tolerance class: M
• Execution/code: A

Special features

• Coating technology: Tiger·tec Silver (coated carbide)
• Sort: WKK20S (wear‑resistant, for cast iron)
• Optimised for abrasive wear and short, breaking chips
• Suitable application: cast iron machining (ISO group K)
• Base designation without sort: CNMA120412-RK5

FAQ

What materials is this insert intended for?
The CNMA120412-RK5 WKK20S insert is formulated for machining cast iron (ISO group K) and is optimised to handle abrasive grey and ductile cast materials.

How does the Tiger·tec Silver coating benefit performance?
The Tiger·tec Silver coating on the WKK20S grade increases resistance to abrasive wear, extending tool life and maintaining dimensional stability during prolonged roughing cycles.

What chip behaviour can be expected with the RK5 chipbreaker?
The RK5 chipbreaker produces short, controlled chips on cast iron, improving evacuation and reducing the risk of chip entanglement in turning operations.

Is the geometry suitable for both roughing and semi‑finishing?
Yes, the rhombic 80° form with a 1.2 mm corner radius provides a versatile profile appropriate for heavy stock removal and subsequent semi‑finishing passes.

How is the insert identified during tool set‑up?
The insert carries the ISO designation CNMA120412-RK5 WKK20S, which matches standard toolholder identification and assists with quick replacement and inventory management.

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

Protected trademarks and product names are the property of their respective owners. Brand names are used for explanation only. The offered item is original, factory‑new goods from the manufacturer.