VCMT160408-RK4 WKK20S WKK20S Wendeplatten - Walter Tools

Take advantage of the combination of high wear resistance, optimised chip control and precise geometry for reliable cast iron turning; request cutting data or a stock confirmation from Metav Werkzeuge to integrate these inserts into production planning.

VCMT160408-RK4 WKK20S — Turning insert (Rhombic 35°, RK4) by Walter Tools

The VCMT160408-RK4 WKK20S is a coated carbide turning insert designed for productive machining of cast iron, delivering stable chip formation and consistent surface quality in general turning applications.

• Tiger‑tec Silver coating for excellent wear resistance
• Optimised RK4 chipbreaker for stable chips
• Rhombic 35° form for versatile turning
• Designed for cast iron machining

Increased productivity through tailored chip control

The combination of the RK4 chipbreaker and the Tiger‑tec Silver coating is engineered to reduce downtime and improve process stability when machining abrasive cast iron grades. The chip geometry promotes short, broken chips that evacuate reliably from the cutting zone, lowering the risk of workpiece damage and tool interference. In practical terms, this means fewer interruptions for chip clearing and a higher effective spindle utilisation. The description of the grade emphasises adaptation to abrasive wear and rapid chip breakage, which supports consistent cycle times on series production.

Predictable surface quality and stable cutting geometry

The rhombic 35° insert geometry with a corner radius of 0.8 mm and a clearance angle of 7° provides a balanced cutting edge suitable for a wide range of turning tasks. The moderately small radius assists in obtaining a consistent surface finish while still allowing for light to medium depth cuts. The tolerance class M ensures repeatable seating in the toolholder and stable cutting conditions across insert changes. For those less familiar with insert geometry: the 35° rhombic form gives a compromise between strength and sharpness, allowing effective approach angles for longitudinal and facing operations.

Robust grade and economical tool life for cast iron

The WKK20S grade is a coated carbide designed specifically for cast iron applications, focusing on resistance to abrasive wear and the frequent short-breaking chips typical for these materials. Coating technology from the Tiger‑tec Silver family improves edge stability and extends the interval between indexings, contributing to lower tooling cost per part. The insert format VCMT160408-RK4 supports straightforward handling in standard toolholders and is suitable for machinists seeking a reliable, ready-to-use solution for series and single-part production on cast iron components.

Request application advice or a stock check from Metav Werkzeuge to confirm suitability for specific workpiece material and cutting parameters; contact Metav Werkzeuge via info@metav-werkzeuge.com or call +49 2822 7131930 to obtain genuine Walter Tools inserts and recommended cutting data

Technical data

• SKU: VCMT160408-RK4-WKK20S-WALTER
• Product: Turning insert (drehwendeschneidplatte)
• Brand: Walter Tools
• Series: Tiger‑tec Silver
• Grade: WKK20S
• ISO designation: VCMT160408-RK4 WKK20S

Facts

• Size: 16 mm
• Thickness: 04
• Corner radius: 0.8 mm
• Clearance angle: 7°
• Form: Rhombic 35°
• Tolerance class: M

Special features

• Chipbreaker: RK4
• Material application: Cast iron (K)
• Coating technology: Tiger‑tec Silver
• Substrate: Coated carbide
• Intended behaviour: optimised for abrasive wear and short‑breaking chips

FAQ

What materials is this insert intended for? The insert is designed primarily for machining cast iron; the WKK20S grade and Tiger‑tec Silver coating are optimised for abrasive cast iron and short-breaking chip behaviour.

Which chipbreaker does the insert use and what benefit does it provide? The RK4 chipbreaker promotes controlled, short chips that evacuate reliably, reducing the need for manual chip clearing and improving process stability during cast iron turning.

How does the rhombic 35° geometry affect cutting performance? A rhombic 35° form offers a compromise between edge strength and access angle, delivering consistent surface finish and suitability for both longitudinal turning and light facing cuts.

What does the grade designation WKK20S mean for tool life? The WKK20S grade is a coated carbide formulation intended to resist abrasive wear typical of cast iron, which helps extend tool life and reduce tooling cost per part in series machining.

Is the insert compatible with standard tooling systems? The VCMT160408-RK4 insert follows standard ISO insert dimensions and is compatible with holders designed for VCMT‑type rhombic 35° inserts.

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

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