SPMT09T304-MK4 WKK20S MK4 Wendeplatten - Walter Tools

Take advantage of the combination of Tiger·tec Silver coating and an optimised MK4 chipbreaker for reliable cast iron machining; order the insert via Metav Werkzeuge or ask the consultants for application advice.

SPMT09T304-MK4 WKK20S — Square 90° turning insert for cast iron, Tiger·tec Silver (Walter Tools)

The SPMT09T304-MK4 WKK20S is a square 90° indexable turning insert engineered for productive machining of cast iron, combining a Tiger·tec Silver coating with a chipbreaker geometry tuned for short, breaking chips.

• Tiger·tec Silver coated carbide grade WKK20S
• Optimised MK4 chipbreaker for cast iron
• Square 90° insert with 0.4 mm corner radius
• 11° clearance angle for secure cutting action
• Compatible with SPMT09T304-MK4 toolholders

Increase productivity with advanced coating and grade

The combination of the Tiger·tec Silver coating and the WKK20S grade delivers improved tool life and consistent performance when machining cast iron. The coating technology reduces abrasive wear and supports higher cutting parameters while maintaining edge stability. For shops seeking predictable tool behaviour, the coated carbide composition balances wear resistance and toughness, which translates into longer intervals between indexings and a lower cost per part. Explaining the technical advantage: the coating reduces friction and thermal load, enabling stable cutting even under interrupted chip formation typical for cast materials.

Stable chip control and geometry for better surface quality

The insert’s MK4 chipbreaker and square 90° geometry are tailored to produce short, manageable chips and a steady metal removal rate. The 0.4 mm corner radius increases edge robustness, improving resistance against chipping while still supporting acceptable surface finish—larger radii resist wear, smaller radii favour finer finishes; the chosen radius is a compromise for versatile turning tasks. In practice, the chipbreaker channels and rake geometry control chip flow and reduce the risk of entanglement, which shortens machine downtime and simplifies swarf handling. This geometry also supports reliable insert indexing, keeping machine uptime high.

Application focus: cast iron machining with ISO-class reliability

Designed for the ISO 513 material group K, this insert excels in finishing and medium-depth turning operations on cast iron, where abrasive wear and short, brittle chips are common. The WKK20S grade is classified as a universal, slightly tougher variant within the Tiger·tec Silver family, offering broad applicability across grey and nodular cast irons. For production environments that demand process reliability and repeatable results, the insert’s combination of grade and geometry helps maintain consistent dimensional accuracy and surface integrity. Technical users will value the clear match between material group and cutting-edge design, which supports predictable tool life and machining output.

For high-process-security cast iron turning, select the Walter Tools Tiger·tec Silver insert and contact Metav Werkzeuge for detailed application guidance and order assistance — eMail: info@metav-werkzeuge.com, Tel: +49 2822 7131930

Technical Data

• Article number: SPMT09T304-MK4-WKK20S-WALTER
• Designation: SPMT09T304-MK4 WKK20S
• Product type: Turning insert (indexable)
• Series: Tiger·tec Silver
• Grade: WKK20S
• Manufacturer: Walter Tools

Specifications

• Clearance angle: 11°
• Corner radius: 0.4 mm
• Insert size: 09
• Plate thickness: T3
• Tolerance class: M

Features

• MK4 chipbreaker geometry
• Square 90° plate form
• Coated carbide (Tiger·tec Silver)
• Suitability: cast iron machining (ISO group K)

FAQ

Which materials is this insert intended for?
The insert is designed primarily for cast iron (ISO group K); the WKK20S grade and Tiger·tec Silver coating are optimised for abrasive wear and short, breaking chips.

What advantage does the MK4 chipbreaker provide?
The MK4 chipbreaker controls chip formation to create short, manageable chips, improving swarf handling and reducing the risk of chip-related interruptions during turning operations.

How does the 0.4 mm corner radius affect performance?
A 0.4 mm radius provides a compromise between edge strength and surface finish: it increases resistance to chipping while maintaining a finish suitable for many turning tasks.

Is the insert compatible with standard SPMT09T304-MK4 toolholders?
Yes, the designation matches standard toolholders for SPMT09T304-MK4 inserts and the geometry is intended for use in compatible clamping systems.

Manufacturer/Responsible: Walter Deutschland GmbH, Derendinger Straße 53, 72072 Tübingen
The Walter AG (brand appearance: Walter Tools) is one of the world's leading manufacturers of precision tools for metalworking and is part of the Swedish Sandvik Group. Protected trademarks and trade names remain the property of their respective owners. Brand names and protected designations are used for explanatory purposes only. There is no affiliation between our company and the mentioned brands; the offered item is an original, factory-new product of the manufacturer.