SCMT09T304-RK4 WKK20S WKK20S Wendeplatten - Walter Tools

High process reliability and long tool life result from the Tiger‑tec Silver coating and the WKK20S grade, delivering stable chip formation and effective resistance against abrasive wear. Combined with the RK4 chipbreaker and a robust square geometry, this insert supports continuous, productive machining of cast iron. Order directly via Metav Werkzeuge or consult our specialists for application-specific advice.

SCMT09T304-RK4 WKK20S — Indexable Turning Insert for Cast Iron, Tiger‑tec Silver — Walter Tools

A compact SCMT09T304-RK4 WKK20S indexable insert engineered for productive cast iron turning, featuring the Tiger‑tec Silver coating and an RK4 chipbreaker for controlled chip shape.

• Tiger‑tec Silver coating for wear resistance
• Optimised RK4 chipbreaker for brittle chips
• Square 90° geometry with 0.4 mm corner radius
• Suitable for cast iron machining (ISO group K)

Proven wear resistance for abrasive cast iron work

The coated carbide grade offers excellent wear resistance tailored to the high abrasion typical of cast iron. The WKK20S grade, part of the Tiger‑tec Silver family, is a coated cemented carbide designed to manage the frequent short, breaking chips encountered in grey and nodular castings. This results in longer tool life and fewer interruptions for tool changes, supporting predictable production cycles and improved overall efficiency. The product's material pairing and coating chemistry ensure that edge integrity is maintained under cyclic thermal and mechanical loads, which is essential for abrasive workpiece materials.

Controlled chip formation and consistent surface results

Chip control is secured by the RK4 chipbreaker, which is optimised for brittle chips and promotes stable evacuation during turning operations. The square 90° geometry combined with a 0.4 mm corner radius produces a robust cutting edge that balances strength with the ability to achieve a consistent surface finish. The 7° free angle reduces cutting forces and supports reliable dimensional control, particularly when machining interrupted surfaces or complex cast-iron contours. Explained simply: the chipbreaker shapes the chips to avoid tangling and the small corner radius helps maintain edge stability without sacrificing surface quality.

Integration into productive tooling systems

With a plate size of 09 and a thickness of T3, the insert fits standard square-turning holders and is straightforward to index or replace, reducing clamping time and downtime. The tolerance class M ensures repeatable seating and secure clamping in modern toolholders, which is beneficial for medium- to high-volume production runs. By combining a durable grade and a pragmatic geometry, this insert supports higher machining rates and consistent part quality, contributing to improved process economy and lower unit production costs over time.

Application scope and practical guidance

Designed specifically for ISO group K (cast iron) applications, the insert is best used for general turning and medium-duty finishing of cast components where brittle chip behaviour and abrasive wear dominate. The combination of Tiger‑tec Silver coating and the RK4 geometry makes it less suitable for austenitic stainless steels or highly ductile alloys; selection should match workpiece material and intended cutting parameters. If further technical information or cutting data are required for a specific operation, Metav Werkzeuge’s application team can advise on cutting speeds, feeds and holder selection to achieve the desired balance between productivity and surface quality.

Choose the Walter Tools SCMT09T304-RK4 WKK20S for reliable cast iron performance and contact Metav Werkzeuge for tailored application support and rapid supply.

Technical Data

• Article number: SCMT09T304-RK4-WKK20S-WALTER
• Designation: SCMT09T304-RK4 WKK20S
• Manufacturer: Walter Tools
• Series: Tiger‑tec Silver
• Grade: WKK20S
• Geometry: Square 90°
• Chipbreaker: RK4

Facts

• Corner radius: 0.4 mm
• Free angle: 7°
• Plate size: 09
• Thickness: T3
• Tolerance class: M

Special features

• Coating: Tiger‑tec Silver
• Material: Coated cemented carbide
• Suitable for: Cast iron (ISO group K)
• Sorteneinsatz: Optimised for abrasive wear and short chips

FAQ

Which materials is this insert intended for?
The SCMT09T304-RK4 WKK20S is formulated primarily for cast iron (ISO group K); the WKK20S grade and Tiger‑tec Silver coating are tuned to manage abrasive wear and short, breaking chips in cast materials.

What does the RK4 chipbreaker do?
The RK4 chipbreaker controls chip shape for brittle materials, promoting stable evacuation and preventing entanglement; combined with the insert geometry it supports consistent surface quality when turning cast iron.

What geometric details influence cutting performance?
Key specs are the 0.4 mm corner radius, square 90° outline and 7° free angle, together providing a robust edge for medium-duty turning while assisting dimensional stability and surface finish.

Is this insert suitable for finishing operations?
The insert can be used for general finishing and medium machining of cast iron; for ultra-fine finishes or very low cutting forces, a smaller radius or specialised finishing geometry may be preferable.

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

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