CCMT120412-RK4 WKK20S WKK20S Wendeplatten - Walter Tools

Take advantage of the combination of Tiger‑tec Silver wear resistance and the insert’s geometry for efficient machining of cast iron; the RK4 chipbreaker and Rhombus 80° form promote reliable chip control and consistent surface quality. Order this insert directly via Metav Werkzeuge or consult our technical advisors for machining parameters.

CCMT120412-RK4 WKK20S — Boring/turning indexable insert, Tiger‑tec Silver, for cast iron · Walter Tools

CCMT120412-RK4 WKK20S is an indexable turning and boring insert designed for productive machining of cast iron components in industrial workshops.

• Tiger‑tec Silver coating for high wear resistance
• Optimised for cast iron applications
• Rhombus 80° form for stable cutting
• 7° clearance with 1.2 mm corner radius

Faster, more consistent cast iron machining through advanced grade technology

The WKK20S grade, based on Tiger‑tec Silver technology, is engineered specifically for abrasive cast iron conditions. Thanks to its coated carbide composition, this insert resists abrasive wear and copes well with the short, breaking chips typical of grey and nodular cast irons. As a result, cycle times are reduced and tool change frequency falls, contributing directly to lower operating costs and higher throughput in production environments. The combination of coating and substrate delivers predictable life under continuous machining.

Geometry that stabilises the cut and controls chips

The insert’s Rhombus 80° form and 7° clearance create a robust cutting edge that reduces vibration during both turning and boring operations. The 1.2 mm corner radius adds edge strength for interrupted cuts and improves surface finish in roughing passes. The RK4 chipbreaker is tuned for fragmenting chips in cast iron, easing evacuation from the cutting zone and minimising rework. These geometric choices translate into fewer rejects and steadier dimensional accuracy when producing turned components.

Seamless integration into production workflows and tooling systems

With the ISO designation CCMT120412-RK4 WKK20S, the insert fits common toolholders and adapts to a range of boring and turning applications where cast iron is the primary material. The insert’s tolerance class (M) ensures repeatable seating and stable clamping, which supports process reliability on CNC lathes and boring bars. For workshops seeking to scale productivity, this insert offers a practical balance of life, surface quality and ease of use, and it pairs well with standard coolant strategies for cast iron machining.

Contact Metav Werkzeuge today to specify cutting data or to arrange sample trials of the Walter Tools CCMT120412-RK4 WKK20S insert for cast iron applications

Technical data

• Article number: CCMT120412-RK4-WKK20S-WALTER
• Product type: Boring/turning indexable insert
• Manufacturer: Walter Tools
• Grade: WKK20S
• Series: Tiger‑tec Silver

Core data

• Relief angle: 7°
• Corner radius: 1.2 mm
• Plate form: Rhombus 80°
• Plate size: 12
• Plate thickness: 04

Special features

• Chipbreaker: RK4
• Coated carbide grade
• Application: Cast iron
• ISO designation: CCMT120412-RK4 WKK20S
• Execution: T
• Tolerance class: M

FAQ

What materials is this insert intended for?
The CCMT120412-RK4 WKK20S insert by Walter Tools is designed primarily for cast iron machining and is tailored to cope with the abrasive wear and short-chip behaviour typical of those materials.

How does the Tiger‑tec Silver coating benefit tool life?
The Tiger‑tec Silver coating on the WKK20S grade reduces abrasive wear and improves heat resistance, which extends cutting life and maintains a sharper edge during high-volume cast iron production.

Which chipbreaker should be used for interrupted cuts in cast iron?
The RK4 chipbreaker integrated in this insert is optimised for fragmenting chips in cast iron and supports reliable chip flow even under interrupted cutting conditions.

Is the insert compatible with standard CCMT toolholders?
Yes, the ISO designation CCMT120412-RK4 WKK20S matches standard CCMT toolholder interfaces, enabling straightforward replacement and secure clamping in typical turning and boring setups.

What geometric features improve surface finish and edge stability?
The Rhombus 80° form combined with a 1.2 mm corner radius and 7° clearance delivers edge strength and reduced vibration, contributing to improved surface finish and consistent dimensional results.

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

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