CNMA120408-RK5 WKK20S WKK20S Wendeplatten - Walter Tools

High abrasion resistance from the Tiger·tec Silver coating and a dedicated RK5 chipbreaker deliver consistent chip control and longer uptime for cast-iron turning; combine these strengths with the robust rhombic 80° geometry for reliable edge life. Order the CNMA120408-RK5 WKK20S directly via Metav Werkzeuge or consult our specialists for application support.

CNMA120408-RK5 WKK20S indexable turning insert for cast iron by Walter Tools

The CNMA120408-RK5 WKK20S is a rhombic 80° indexable turning insert designed for productive machining of cast-iron components with optimised chip formation and wear resistance.

• Tiger·tec Silver coating for high wear resistance
• RK5 chipbreaker for short chips
• Rhombic 80° geometry for strength and versatility

Consistent cutting performance for abrasive cast-iron machining

The Tiger·tec Silver coating on this turning insert resists abrasive wear typically encountered when machining cast iron, extending edge life and reducing changeovers. The graded WKK20S carbide substrate, combined with a thin, wear-resistant coating, balances toughness and hardness to withstand interrupted cuts and the abrasive nature of grey and nodular cast irons. As a result, machining cycles remain stable and predictable, supporting higher throughput in batch production.

Reliable chip control and process stability

Equipped with the RK5 chipbreaker, the insert produces short, controllable chips that reduce the risk of entanglement and simplify handling at higher feeds. The rhombic 80° shape and 0° (negative) free cutting angle increase insert strength in heavy cuts, while the 0.8 mm corner radius helps deliver improved surface finish where required. These features combined lead to fewer interruptions, better toolholder balance, and more consistent cycle times on turning centres.

Practical benefits for workshop productivity and cost-efficiency

Selecting this turning insert supports economical production: longer effective edge life and steady chip behaviour lower tooling consumption and downtime. The robust geometry ensures repeatable results across series parts, helping to maintain dimensional consistency. For users machining cast-iron components, the insert’s specifications reduce the need for frequent rework and allow more predictable planning of tool-change intervals.

Speak with Metav Werkzeuge for tailored cutting data and to secure the Walter Tools CNMA120408-RK5 WKK20S for cast-iron production.

Technical data

• SKU: CNMA120408-RK5-WKK20S-WALTER
• Designation: CNMA120408-RK5 WKK20S
• Series: Tiger·tec Silver
• Grade: WKK20S
• Manufacturer: Walter Tools

Key measurements

• Insert size: 12
• Thickness code: 04
• Corner radius: 0.8 mm
• Free cutting angle: 0° (negative)
• Tolerance class: M

Special features

• Coating: Tiger·tec Silver (coated carbide)
• Chipbreaker: RK5
• Shape: Rhombus 80°
• Material group: K (cast iron)
• Execution: A

FAQ

What materials is this insert designed for?

The CNMA120408-RK5 WKK20S from Walter Tools is optimised for machining cast iron (material group K) according to the grade and coating characteristics.

How does the RK5 chipbreaker affect machining?

The RK5 chipbreaker on this insert produces short, controllable chips that improve handling and process stability during cast-iron turning operations.

What are the key geometry specifications to consider?

Key dimensions include the rhombic 80° shape, a corner radius of 0.8 mm, insert size 12 and thickness code 04; the insert has a 0° negative rake for increased edge strength.

Which coating and grade are applied to the insert?

This insert uses the Tiger·tec Silver coating and the WKK20S grade—an optimised coated carbide combination for abrasive cast-iron applications.

Does this insert fit standard toolholders?

The insert is a CNMA-style rhombic 80° indexable insert and is intended for toolholders designed for CNMA inserts of matching seat and clamping specifications.

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

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