CNMA160612-RK7 WKK20S Wendeplatten - Walter Tools

Take advantage of the combination of Tiger·tec Silver coating and the RK7 chipbreaker for consistent chip control and long tool life; secure process reliability and reduced machining interruptions by ordering through Metav Werkzeuge or contacting our application consultants for tailored recommendations.

CNMA160612-RK7 WKK20S — Rhombic 80° turning insert for cast iron, Tiger·tec Silver (Walter Tools)

The CNMA160612-RK7 WKK20S is a negative-rake, rhombic 80° indexable turning insert optimised for abrasive cast iron machining and suited to industrial production environments.

• Tiger·tec Silver coated carbide grade WKK20S
• Optimised for cast iron (ISO group K)
• Rhombic 80° insert with 1.2 mm corner radius
• Negative rake 0° and RK7 chipbreaker for stable chips

Consistent chip control for uninterrupted production

The geometry and chipbreaker combination deliver predictable chip formation, helping to avoid built-up edge and frequent interruption. The RK7 chipbreaker is designed to generate short, manageable chips when machining abrasive cast iron, reducing the need for manual chip handling and lowering the risk of tool-induced vibration. With a negative rake 0° configuration and a 1.2 mm corner radius, the insert increases process stability, which translates into fewer tool changes and more continuous machine run-time — a direct productivity advantage for series turning operations.

Coated grade engineered for abrasive cast iron

The Tiger·tec Silver coating combined with the WKK20S grade means the insert resists the abrasive wear typical of cast iron workpieces. The coated carbide construction offers a balance between wear resistance and toughness, so the cutting edge maintains integrity under interrupted cuts and changing cutting conditions. For applications within ISO group K (cast iron), this composition supports longer tool life and more consistent surface finishes, thereby lowering per-part tooling cost and improving batch-to-batch reproducibility.

Geometry and tolerance for accurate, repeatable turning

The rhombic 80° form and specified tolerance class M deliver precise seating and predictable engagement in compatible toolholders. The insert’s basic dimensions (inscribed circle 16, thickness code 06) and the Rhombic 80° shape allow versatile setup options for both roughing and finishing passes, while the tolerance class M supports repeatable positioning across indexable setups. These attributes help maintain concentricity and dimensional control on turned components, which is particularly valuable when producing matched features or interchangeable parts.

Practical process advantages and application guidance

Designed specifically for cast iron machining, the insert supports stable cutting under conditions that commonly cause abrasive wear. The combination of the WKK20S grade and the Tiger·tec Silver platform enables reliable performance across a broad range of grey and nodular cast irons. For best results, pair the insert with a rigid toolholder and moderate feed rates to exploit the short-chip behaviour; for specific cutting data tailored to component geometry and machine capability, Metav Werkzeuge’s application consultants can provide process guidance and optimisation proposals.

For process assurance with Walter Tools’ Tiger·tec Silver grade, contact Metav Werkzeuge for availability and application support: info@metav-werkzeuge.com or +49 2822 7131930

Technical data

• SKU: CNMA160612-RK7-WKK20S-WALTER
• Label: Drehwendeschneidplatte CNMA160612-RK7 WKK20S Walter Tools
• Manufacturer: Walter Tools
• Series: Tiger-tec Silver
• Grade: WKK20S

Numbers / Core technical data

• Inscribed circle: 16
• Thickness code: 06
• Corner radius: 1.2
• Relief angle: 0° (negative)
• Tolerance class: M

Designs / Special features

• Rhombic 80° plate form
• RK7 chipbreaker
• Coated carbide grade Tiger·tec Silver
• Suited for cast iron (ISO group K)
• Execution: A

FAQ

What materials is this insert best suited for?
This insert is optimised for cast iron machining; the WKK20S grade on the Tiger·tec Silver platform is specifically designed for abrasive cast iron (ISO group K).

How does the RK7 chipbreaker affect machining?
The RK7 chipbreaker promotes short, controllable chips when turning cast iron, reducing interruptions and improving process stability for continuous production.

Is the insert compatible with standard CNMA toolholders?
The rhombic 80° geometry and the CNMA designation indicate compatibility with CNMA-style indexable toolholders; verification with the specific holder is recommended for correct seating.

What performance benefits does the Tiger·tec Silver coating provide?
The Tiger·tec Silver coating enhances wear resistance on abrasive cast irons while preserving toughness, supporting longer tool life and consistent surface quality over extended runs.

How to get recommended cutting data for a specific component?
For application-specific cutting parameters and optimisation, Metav Werkzeuge’s consultants can provide tailored recommendations based on material grade and machine capability

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

Protected trademarks and trade names are the property of their respective owners. Brand names and protected product names are mentioned for explanatory purposes only. There is no connection between our company and the mentioned brands. The offered item is original, brand-new goods from the manufacturer Walter Tools.