CPGT09T308-MK4 WKK20S Wendeplatten - Walter Tools

Taking advantage of Tiger‑tec Silver coating and the WKK20S grade together with the MK4 chipbreaker and a Rhombic 80° geometry delivers consistent performance when machining abrasive cast iron; benefit from extended tool life and controlled chip formation. Order the insert directly via Metav Werkzeuge or contact our consultants for application-specific cutting data.

CPGT09T308-MK4 WKK20S – Turning indexable insert, Rhombic 80° (Walter Tools)

The CPGT09T308-MK4 WKK20S is an indexable turning insert engineered for efficient, repeatable machining of cast iron components, combining a Tiger‑tec Silver coating with a chipformer optimised for short, breaking chips.

• Tiger‑tec Silver coating for wear resistance
• Optimised for cast iron (ISO group K)
• Rhombic 80° form with 0.8 mm corner radius
• MK4 chipbreaker for controlled chip formation

Superior wear resistance and reliable performance for cast iron

The combination of the WKK20S grade and Tiger‑tec Silver coating is designed specifically to meet the demands of cast iron machining (ISO group K). This coated cemented carbide composition addresses abrasive wear and the typically short, brittle chips encountered on cast parts, resulting in improved edge stability and longer tool life. The engineering of the grade promotes consistent cutting behaviour across batch production, reducing rework and securing process reliability in series turning applications.

Geometry and chip control that boost productivity

The insert’s Rhombic 80° geometry together with an MK4 chipbreaker provides predictable chip formation and stable cutting forces. A 0.8 mm corner radius supports smooth surface finishes while maintaining strength at the cutting edge, and the 11° clearance angle helps to reduce rubbing and heat build‑up. The combination of these features enables higher cutting feeds and stable metal removal rates, which contributes directly to shorter cycle times and more efficient machining cycles on abrasive cast iron workpieces.

Practical handling and process benefits in production environments

Supplied as a size 09 insert with thickness T3 and tolerance class G, this indexable insert facilitates straightforward tool management and repeatable set‑ups. The CPGT09T308-MK4 WKK20S is suitable for serial turning where tool life and consistent surface quality are priorities; its chip control reduces interruptions from poor chip evacuation and minimises secondary operations. For tooling systems running multiple inserts, the predictable performance of this grade supports planning for tool changes and inventory, helping to control manufacturing costs over time.

Contact Metav Werkzeuge to request tailored cutting data, delivery options and expert advice for genuine Walter Tools Tiger‑tec Silver turning inserts.

Technical data

• Article number: CPGT09T308-MK4-WKK20S-WALTER
• Type: Turning indexable insert
• Brand: Walter Tools

Facts

• Clearance angle: 11°
• Corner radius: 0.8 mm
• Insert shape: Rhombic 80°
• Insert size: 09
• Thickness: T3
• Tolerance class: G

Special features

• Grade: WKK20S
• Coating technology: Tiger‑tec Silver
• Chipbreaker: MK4
• Suitable for: Cast iron (ISO group K)
• Material: Coated cemented carbide
• Series: Tiger‑tec Silver
• Execution: T
• Designation: CPGT09T308-MK4

FAQ

What materials is this insert intended for?
The insert is specified for machining cast iron (ISO group K); the WKK20S grade and Tiger‑tec Silver coating are optimised for abrasive cast materials.

How does the MK4 chipbreaker influence machining?
The MK4 chipbreaker delivers controlled, short chips and improved evacuation, which reduces stoppages and supports consistent surface quality during turning.

What does the 0.8 mm corner radius mean for surface finish?
A 0.8 mm corner radius strengthens the cutting edge and helps to produce a smoother finish while maintaining edge robustness for interrupted or heavy cuts.

Is this insert compatible with standard clamping systems?
The insert follows common indexable insert dimensions for a size 09 Rhombic 80° form and is suitable for toolholders designed for that geometry and tolerance class G.

Can this grade be used for mixed production of different cast iron types?
Yes; WKK20S is a versatile Walter grade for a broad range of cast iron types, offering stable chip behaviour across varying cast structures.

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

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