CNMA160616-RK7 WKK20S WKK20S Wendeplatten - Walter Tools

Take advantage of the combination of Tiger‑tec Silver coating and a robust RK7 chipbreaker for reliable, high‑productivity cast‑iron machining; the rhombic 80° geometry and 1.6 mm corner radius ensure consistent surface quality and secure clamping — order the insert directly via Metav Werkzeuge or consult our specialists for application support.

CNMA160616-RK7 WKK20S turning insert – Tiger‑tec Silver, for cast iron | Walter Tools

The CNMA160616-RK7 WKK20S is a coated carbide turning insert engineered for productive machining of cast iron components, combining a wear‑resistant grade with a chipformer optimised for short, breaking chips.

• Tiger‑tec Silver coating technology
• Optimised for cast iron (ISO group K)
• RK7 chipbreaker for stable chip control
• Rhombic 80° form for versatile use

Sustained productivity through advanced grade and chip control

The insert employs Tiger‑tec Silver coating with the WKK20S grade, a coated carbide designed specifically for abrasive cast‑iron work. This combination reduces flank and crater wear, extending tool life under demanding conditions and lowering downtime. The integrated RK7 chipbreaker produces short, controlled chips that improve process stability during interrupted cuts and heavy engagement, which translates into higher throughput and fewer secondary operations. These technical choices deliver measurable productivity advantages while maintaining consistent part quality.

Geometry and edge design for secure cutting and repeatable accuracy

The rhombic 80° plate form and the 0° (negative) rake angle provide a robust cutting edge and secure seating in standard turning holders. A corner radius of 1.6 mm balances strength and surface finish, enabling reliable roughing and light finishing passes without premature edge breakdown. The plate thickness designation (06) and the M tolerance class support repeatable positioning in the toolholder, reducing setup variation and helping to achieve tight dimensional tolerances in serial production.

Application range, handling and process assurance

Specified for the ISO K group, this insert is tuned to the abrasive wear patterns and typically short, brittle chips of cast iron. The WKK20S grade offers a universal, tougher behaviour within the Tiger‑tec Silver family, making the insert suitable for a range of cast‑iron grades and machining strategies. The combination of grade and chipbreaker reduces built‑up edge and improves surface integrity, supporting continuous operation and predictable tool change intervals. For complex components or mixed‑material batches, the insert’s balanced design contributes to process security and consistent results across shifts.

For process‑secure turning with Walter Tools' Tiger‑tec Silver range, contact Metav Werkzeuge for availability and tailored application advice at info@metav-werkzeuge.com or by phone on +49 2822 7131930

Technical data

• SKU: CNMA160616-RK7-WKK20S-WALTER
• Designation: CNMA160616-RK7 WKK20S
• Manufacturer: Walter Tools
• Series: Tiger‑tec Silver
• Execution: A

Facts

• Plate shape: Rhombus 80°
• Rake angle: 0° (negative)
• Corner radius: 1.6 mm
• Plate size: 16
• Plate thickness: 06
• Tolerance class: M
• Chipbreaker: RK7

Special features

• Grade: WKK20S (coated carbide)
• Application: cast iron (ISO group K)
• Optimised for abrasive wear and short chips
• Suitable for roughing and finishing operations
• Stable cutting edge for interrupted cuts

FAQ

What materials is this insert suited for?
The CNMA160616-RK7 WKK20S turning insert is designed primarily for cast iron (ISO group K) and is optimised for the abrasive wear and short‑chip behaviour typical of those materials.

What does the RK7 chipbreaker do?
The RK7 chipbreaker on this Walter Tools insert shapes short, breaking chips and improves chip evacuation, which enhances process stability during heavy cuts and interrupted machining.

How does the Tiger‑tec Silver coating benefit tool life?
Tiger‑tec Silver reduces abrasive and thermal wear on the cutting edge, so the WKK20S grade maintains a sharper profile longer and supports longer, more productive tool life in cast‑iron applications.

What is the effect of the 0° (negative) rake angle?
A 0° (negative) rake gives the insert a more robust cutting edge, increasing resistance to edge chipping and making it suitable for heavy engagement and interrupted cuts.

Is the insert suitable for finishing as well as roughing?
Yes. With a 1.6 mm corner radius and the WKK20S grade, the insert provides a good compromise between strength for roughing and the ability to produce acceptable surface quality in finishing passes.

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

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