TNMA160408-RK5 WKK20S Wendeplatten - Walter Tools

Take advantage of a high-performance cutting solution that combines the Tiger·tec Silver coating and the WKK20S grade for reliable, wear-resistant machining of cast iron; the RK5 chipbreaker ensures controlled, repeatable chips and stable cutting forces for productive turning. Order directly via Metav Werkzeuge or consult our technical advisers for application-specific recommendations.

TNMA160408-RK5 WKK20S indexable turning insert for cast iron by Walter Tools

A TNMA160408-RK5 WKK20S indexable turning insert engineered for robust, efficient machining of cast iron, featuring a Tiger·tec Silver coated carbide grade and RK5 chip control for short, predictable chips

• Tiger·tec Silver coated carbide
• RK5 chipbreaker for cast iron
• Triangle 60° insert form
• 0.8 mm corner radius, size 16

Deliver consistent productivity with coated-carbide performance

The coated carbide grade provides a combination of wear resistance and toughness that benefits high-volume turning of abrasive cast-iron materials. The WKK20S grade, part of the Tiger·tec Silver series, is optimised for the ISO K group and reduces flank and crater wear under typical interrupted and continuous cutting conditions. As a result, the machining process gains in productivity and repeatability: fewer insert changes are required and component tolerances remain stable across batches. For planning, the insert’s coating technology supports extended tool life without sacrificing cutting-edge stability.

Controlled chip formation for safer, faster machining

Chip control is a decisive factor when turning cast iron; the RK5 chipbreaker on this insert shapes short, segmented chips that evacuate reliably. Improved chip control reduces the likelihood of entanglement and ensures steady cutting forces, which in turn protects the toolholder and workpiece. For operators unfamiliar with chipbreaker nomenclature: RK5 denotes a geometry tailored to the brittle, often abrasive nature of cast irons, producing predictable chips and supporting higher feed rates while maintaining surface integrity and process security.

Geometry designed for secure seating and dimensional accuracy

The triangular 60° insert form combined with a 0.8 mm corner radius delivers a balance between strength and edge accessibility. The 60° shape allows for versatile toolholder clamping and multiple indexing positions, while the corner radius supports more robust edge strength during interrupted cuts. The insert size 16 and specified thickness ensure compatibility with standard clamping systems designed for TNMA-style inserts, offering straightforward replacement and reliable repeatability in serial production.

Coating and grade explained for application matching

The Tiger·tec Silver coating system provides a multi-layer surface that reduces abrasive wear and promotes thermal resistance at the cutting edge. The WKK20S grade is a coated cemented carbide developed for cast-iron applications, combining a harder surface with a substrate designed to withstand shock from interrupted cuts. For practical planning, this means the insert performs well across a range of cast-iron types commonly encountered in industry, lowering tooling costs per part through longer life and fewer unexpected tool interventions.

For process-stable cast-iron turning with Walter Tools' Tiger·tec Silver grade, contact Metav Werkzeuge for application advice and rapid supply via info@metav-werkzeuge.com or call +49 2822 7131930

Technical data

• Article number: TNMA160408-RK5-WKK20S-WALTER
• Designation: TNMA160408-RK5 WKK20S
• Manufacturer: Walter Tools
• Product type: Indexable turning insert
• Series: Tiger·tec Silver

Facts

• Insert shape: Triangle 60°
• Corner radius: 0.8 mm
• Insert size: 16
• Plate thickness: 04
• Free cutting angle: 0° (negative)
• Tolerance class: M

Special features

• Grade: WKK20S (coated carbide)
• Chipbreaker: RK5
• Material application: Cast iron (ISO K)
• Execution: A

FAQ

Is this insert suitable for all types of cast iron?
The TNMA160408-RK5 WKK20S insert is formulated for the ISO K group and performs across a broad range of cast-iron grades, delivering reliable wear resistance and good chip control in most grey and nodular cast-iron turning operations.

What benefit does the Tiger·tec Silver coating provide?
Tiger·tec Silver enhances edge life and thermal stability for the WKK20S grade, reducing abrasive wear and enabling longer cutting intervals when turning abrasive cast-iron materials.

How does the RK5 chipbreaker influence machining parameters?
The RK5 geometry produces short, controlled chips that improve evacuation and allow for higher feed rates with consistent surface finish, while reducing the risk of chip-related interruptions during turning.

Which clamping systems are compatible with this insert form?
The triangular 60° form and standard TNMA-style dimensions are compatible with conventional indexable-insert toolholders designed for TNMA inserts, enabling secure seating and multiple indexing positions.

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

Die Walter AG (Markenauftritt: Walter Tools) mit Hauptsitz in Tübingen gehört zu den weltweit führenden Herstellern von Präzisionswerkzeugen für die Metallbearbeitung und ist Teil des schwedischen Sandvik-Konzerns. Geschützte Markenzeichen und Warenbezeichnungen liegen im Recht ihrer jeweiligen Eigentümer. Markennamen und geschützte Warenzeichen werden ausschließlich zu Erklärungszwecken genannt. Es besteht keinerlei Verbindung zwischen unserem Unternehmen und den genannten Marken. Es handelt sich bei dem angebotenen Artikel um originale fabrikneue Waren des Herstellers.