WNMA080408-RK7 WKK20S WKK20S Wendeplatten - Walter Tools

Combining the Tiger·tec Silver coating with the WKK20S grade and the RK7 chipbreaker delivers reliable wear resistance and consistent chip control for cast iron turning; secure steady tool life and production stability through Metav Werkzeuge or consult our specialists for application advice.

WNMA080408-RK7 WKK20S — Trigon 80° indexable turning insert for cast iron by Walter Tools

WNMA080408-RK7 WKK20S is an indexable turning insert designed for efficient machining of cast iron, featuring the Tiger·tec Silver coating and an RK7 chipbreaker for stable chip formation.

• Tiger·tec Silver coated carbide
• Optimised RK7 chipbreaker for cast iron
• Trigon 80° form with 0.8 mm corner radius
• Negative 0° relief for stable cutting

Precision for cast iron that improves cycle reliability

This insert combines a coated carbide grade engineered for abrasive conditions with a geometry optimised for cast iron. The WKK20S grade within the Tiger·tec Silver family provides a balance of wear resistance and toughness, which translates into fewer interruptions for tool changes and more predictable tool life. The RK7 chipbreaker is shaped to promote short, controlled chips when turning grey and nodular cast irons, reducing the risk of snarling and improving surface consistency. For production environments where downtime and repeatability matter, this geometry supports steady-cycle turning with fewer process variations.

Stable cutting performance and easy integration into toolholders

The Trigon 80° form gives a robust cutting edge and is suitable for a variety of turning setups where entry angles and clearance are critical. With a 0.8 mm corner radius and a negative 0° relief, the insert offers enhanced edge strength and resistance to shock when encountering interruptions in cast iron. These features help to maintain component tolerances and minimise vibration during finish and semi-finish operations. The insert’s designation and geometry simplify selection for existing toolholders, enabling straightforward replacement and consistent set-ups across multiple machines.

Material-focused design that reduces machining risk

Designed specifically for the abrasiveness and often brittle chip behaviour of cast iron, the insert’s WKK20S coating and substrate combination reduces flank wear while maintaining cutting stability. The result is improved surface quality with fewer reworks and more predictable tool performance under varied feed and speed conditions. Manufacturing teams benefit from the insert’s balance of process security and longevity, supporting higher productivity and better cost-efficiency per component over extended production runs.

Choose the Walter Tools Tiger·tec Silver WKK20S insert for efficient cast iron turning — contact Metav Werkzeuge for technical advice at info@metav-werkzeuge.com or +49 2822 7131930

Technical Data

• Article number: WNMA080408-RK7-WKK20S-WALTER
• SKU: WNMA080408-RK7-WKK20S-WALTER
• Designation: WNMA080408-RK7 WKK20S
• Product type: Indexable turning insert
• Brand: Walter Tools
• Series: Tiger·tec Silver

Facts

• Corner radius: 0.8 mm
• Relief angle: 0° (negative)
• Insert size code: 08
• Thickness code: 04
• Tolerance class: M

Special features

• Coating: Tiger·tec Silver
• Grade: WKK20S (coated carbide)
• Chipbreaker: RK7
• Insert form: Trigon 80°
• Execution/geometry: A
• Suitable for: Cast iron (ISO group K)

FAQ

What workpiece materials is this insert designed for?
The WNMA080408-RK7 WKK20S insert is designed primarily for cast iron (ISO group K), with the WKK20S grade and Tiger·tec Silver coating optimised to resist abrasive wear typical for these materials.

How does the RK7 chipbreaker influence machining of cast iron?
The RK7 chipbreaker promotes short, controlled chips when turning cast iron, improving chip evacuation and reducing the likelihood of chip-related interruptions when using the WNMA080408-RK7 WKK20S from Walter Tools.

Is the Trigon 80° form suitable for both roughing and finishing?
Yes, the Trigon 80° geometry provides a strong cutting edge and, combined with the 0.8 mm corner radius and negative relief, supports both semi-finish and finish passes with stable edge life on cast iron parts.

Can the insert be used in standard toolholders for trigon-shaped inserts?
The insert follows common trigon indexing dimensions; the WNMA080408-RK7 WKK20S is intended for toolholders that accept Trigon 80° inserts, allowing straightforward integration into existing turning tool systems.

What benefits does the Tiger·tec Silver coating offer in production runs?
The Tiger·tec Silver coating on the WKK20S grade enhances wear resistance and heat management during cutting, which helps extend tool life and maintain surface quality across longer production runs.

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

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