RCMT0803M0-RK4 WKK20S Wendeplatten - Walter Tools

Benefit from the combination of high process security, controlled chip formation and a coating engineered for abrasive materials; the result is consistent performance when turning cast iron. Order the RCMT0803M0-RK4 WKK20S insert via Metav Werkzeuge or consult the technical team for application advice.

RCMT0803M0-RK4 WKK20S indexable turning insert — Tiger·tec Silver for cast iron, Walter Tools

RCMT0803M0-RK4 WKK20S is an indexable turning insert optimised for machining abrasive cast iron, offering a robust coated-carbide grade and precise chip control in a round 08 format.

• Tiger·tec Silver coating technology
• WKK20S grade for abrasive cast-iron machining
• RK4 chipbreaker for controlled chip formation
• 7° clearance, round insert RCMT0803 size 08

Consistent performance in abrasive cast-iron turning

The insert delivers stable cutting when machining cast iron thanks to the WKK20S grade, a coated-carbide formulation tailored to resist abrasive wear and the short, brittle chips typical of grey and nodular cast irons. The combination of grade and coating reduces flank and crater wear, which extends the usable life of the insert and maintains dimensional consistency. This translates into fewer tool changes and a more predictable cycle time for production runs.

Coating and grade explained for reliable tool life

Belonging to the Tiger·tec Silver series, the insert features a multi-layer coating that enhances thermal resistance and reduces adhesion of workpiece material. The WKK20S designation indicates a universal, tougher grade within the series that balances wear resistance with fracture toughness for interrupted cuts. For workpieces with high abrasiveness, this coated-carbide construction helps maintain edge integrity and surface finish over longer tool life than standard uncoated grades.

Geometry and chip control that aid productivity

The round RCMT0803 geometry combined with the RK4 chipbreaker enables controlled chip formation and safe evacuation in interrupted or heavy cuts. The 7° clearance angle reduces rubbing at the flank while maintaining a stable cutting edge; the insert thickness and size 08 format support stiffness in the toolholder, reducing vibration and improving surface quality. For applications where chip control and process stability are decisive, this insert geometry contributes directly to higher throughput.

Practical benefits for workshop and production environments

Selecting this insert supports efficiency objectives: fewer indexings, consistent surface finishes and predictable tool-change intervals. The coated-carbide composition and optimised chipbreaker reduce unscheduled downtime caused by premature wear or poor chip evacuation. For shops aiming to standardise tooling for cast-iron operations, the combination of WKK20S grade and Tiger·tec Silver coating provides a cost-effective route to reliable machining performance and repeatable results.

Contact Metav Werkzeuge to secure Tiger·tec Silver WKK20S inserts for high-performance cast-iron turning and to discuss suitable toolholder pairings

Technical data

• Article number / SKU: RCMT0803M0-RK4-WKK20S-WALTER
• Product designation: RCMT0803M0-RK4 WKK20S
• Manufacturer: Walter Tools
• Product type: Indexable turning insert

Facts

• Clearance angle: 7°
• Insert size: 08
• Thickness: 03
• Chipbreaker type: RK4
• Tolerance class: M
• Geometry: Round
• Grade / series: WKK20S — Tiger·tec Silver

Special features

• Coating: Tiger·tec Silver (coated carbide)
• Material application: cast iron (K)
• Designation without grade: RCMT0803M0-RK4
• Execution: T
• Adapted for abrasive wear and short, breaking chips

FAQ

What materials is this insert designed for?
The RCMT0803M0-RK4 WKK20S indexable turning insert is engineered primarily for cast iron machining; the WKK20S grade and Tiger·tec Silver coating address abrasive wear and short-chip behaviour typical of these materials.

How does the RK4 chipbreaker benefit the machining process?
The RK4 chipbreaker provides controlled chip formation and reliable evacuation, reducing entanglement and enabling safer interrupted cuts when using the RCMT0803M0-RK4 WKK20S insert from Walter Tools.

Is this insert suitable for interrupted cuts or heavy roughing?
Yes — the combination of the round insert geometry, WKK20S grade and Tiger·tec Silver coating offers enhanced toughness and abrasion resistance, making the insert suitable for interrupted cutting and heavier material removal when machining cast iron.

Can this insert be used to improve surface finish?
When paired with an appropriate toolholder and cutting parameters, the RCMT0803M0-RK4 WKK20S insert helps maintain a stable cutting edge and consistent surface quality thanks to its coating and chip control features.

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

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