TNMA220408-RK5 WKK20S Wendeplatten - Walter Tools

The combination of Tiger·tec Silver coating and the RK5 chipbreaker delivers controlled short chips and extended tool life for productive cast iron turning; the robust 0.8 mm corner radius and triangle geometry ensure process stability. Order the insert via Metav Werkzeuge or consult their specialists for cutting data and holder recommendations.

TNMA220408-RK5 WKK20S indexable turning insert – Tiger·tec Silver for cast iron (Walter Tools)

The TNMA220408-RK5 WKK20S is a triangular indexable turning insert engineered for efficient, reliable machining of cast iron components in production environments

• Triangle 60° geometry for stable cutting
• Tiger·tec Silver coated carbide for wear resistance
• Optimised for cast iron (ISO K) machining
• RK5 chipbreaker for controlled short chips

Consistent wear resistance for high-volume cast iron work

The WKK20S grade, part of the Tiger·tec Silver series, is a coated carbide cutting solution tuned for the abrasive wear and frequently short, breaking chips typical of cast iron. As a result, the insert provides improved tool life and fewer index changes, which reduces machine downtime and supports a more economical production flow. The coating technology supports higher cutting parameters where appropriate, enabling greater throughput without compromising component quality.

Geometry and edge security that enhance process reliability

The triangular 60° form and an 0.8 mm corner radius supply a robust cutting edge that resists chipping in interrupted cuts and heavy engagement. The 0° (negative) clearance angle increases edge strength, while the RK5 chipbreaker reliably produces short, controllable chips for safe evacuation. With an M tolerance class and execution A, the insert maintains repeatable seating in standard holders, contributing to stable runs and predictable component tolerances.

Practical application and integration into production workflows

Marked as a TNMA-style insert, this item fits toolholders designed for the TNMA format and suits turning operations where cast iron is the primary workpiece material. The grade’s balance between wear resistance and toughness makes it suitable for a range of cast iron types under ISO 513 group K. For workshops focused on consistent cycle times and surface quality, the insert offers a straightforward option to improve chip control and process reliability without complex setup changes. If further specification data or cutting parameters are needed, Metav Werkzeuge’s technical team can advise on optimal feeds, speeds and holder selection.

Contact Metav Werkzeuge for tailored cutting data and to order Walter Tools TNMA220408-RK5 WKK20S inserts for cast iron production.

Technical Data

• SKU: TNMA220408-RK5-WKK20S-WALTER
• Designation: TNMA220408-RK5 WKK20S
• Brand: Walter Tools
• Series: Tiger-tec Silver

Core specifications

• Shape: Dreieck 60°
• Size: 22
• Thickness: 04
• Nose radius: 0,8
• Clearance angle: 0° (negativ)
• Chipbreaker: RK5
• Tolerance class: M
• Execution: A

Special features

• Cutting material: beschichtetes Hartmetall (coated carbide)
• Sort: WKK20S (optimised for cast iron)
• Applicable material group: Cast iron (K, ISO 513)
• Design purpose: indexable turning insert (TNMA format)
• Sorteneinsatz: abrasion and short, breaking chips from cast materials

FAQ

What materials is this insert designed for?
The TNMA220408-RK5 WKK20S insert is designed primarily for cast iron (ISO K) applications and is formulated to handle abrasive wear and short, breaking chips.

How does the RK5 chipbreaker affect machining?
The RK5 chipbreaker promotes short, controllable chips, improving chip evacuation and reducing the risk of entanglement in turning operations with cast iron.

What does the WKK20S grade offer compared with other grades?
The WKK20S grade combines a coated carbide substrate with the Tiger·tec Silver technology to increase wear resistance while maintaining sufficient toughness for productive turning of cast iron.

Which toolholders are compatible with this TNMA insert?
Holders accepting TNMA-format triangular inserts accommodate this product; the geometry and M tolerance class support reliable seating and repeatable alignment in standard toolholders.

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

Walter AG (marketed as Walter Tools) is among the world’s leading manufacturers of precision tools for metalworking and is part of the Swedish Sandvik Group. Trademarks and trade names are the property of their respective owners. Brand names and protected trademarks are mentioned for explanatory purposes only and do not imply any affiliation between our company and the named brands. The offered article is original and brand-new from the manufacturer.