TNMG220412-MK5 WKK20S WKK20S Wendeplatten - Walter Tools

Take advantage of the combination of Tiger‑tec Silver coating, a dedicated WKK20S grade and an optimised MK5 chipbreaker to increase tool life and machining stability in cast‑iron turning; order via Metav Werkzeuge or consult our specialists for cutting data and delivery.

TNMG220412-MK5 WKK20S turning insert — Walter Tools, Tiger‑tec Silver, for cast iron

TNMG220412-MK5 WKK20S is a triangular indexable insert designed for robust turning of cast iron components in production environments

• Tiger‑tec Silver coating for long tool life
• Optimised MK5 chipbreaker for cast iron machining
• Triangle 60° geometry for versatile turning
• 1.2 mm corner radius for robust edge strength

Greater uptime through a wear-resistant grade

The WKK20S grade, integrated in the Tiger‑tec Silver coating system, is developed for the abrasive nature of cast iron and the short, breaking chip forms typical for these alloys. This combination improves tool life and reduces changeover frequency, which in turn lowers cost per component and increases net productivity. For users seeking predictable performance, the coated carbide substrate delivers consistent edge retention and reduced flank wear under intermittent cuts common in cast‑iron turning.

Predictable cutting behaviour from defined geometry

A triangle 60° insert with a 1.2 mm corner radius and 0° negative rake offers a balance between edge strength and accessibility for a range of turning tasks. The MK5 chipbreaker is engineered to produce controllable chips in grey and nodular cast iron, improving machine‑tool interaction and reducing the risk of workpiece surface damage. The triangular shape provides three usable cutting edges per index, enabling efficient use of each insert and predictable repeatability in serial production.

Process security and shop‑floor relevance

The TNMG220412‑MK5 WKK20S indexable insert is specified for industrial turning operations where stability and repeatable part quality are required. Execution class G and tolerance class M support consistent clamping and seating in standard toolholders. Practical benefits include reduced downtime from fewer insert changes, stable chip control with the MK5 geometry and straightforward grade selection for cast‑iron applications. Walter Tools' engineering focus on robust edge preparation and coating technology provides confidence for continuous production use.

For application advice, cutting‑data recommendations or to source production‑proved Tiger‑tec Silver WKK20S inserts from Walter Tools, contact Metav Werkzeuge for expert consultation and prompt supply.

Technical data

• SKU: TNMG220412-MK5-WKK20S-WALTER
• Designation: TNMG220412-MK5 WKK20S
• Manufacturer: Walter Tools
• Product type: Turning indexable insert

Specs

• Series: Tiger‑tec Silver
• Grade: WKK20S
• Shape: Triangle 60°
• Size: 22 mm
• Thickness: 4 mm
• Corner radius: 1.2 mm
• Rake angle: 0° (negative)
• Chipbreaker: MK5
• Execution: G
• Tolerance class: M

Applications & features

• Suitable for cast iron (K)
• Coated carbide grade for abrasive wear resistance
• Optimised for breaking chips and process stability
• Three cutting edges per insert for efficient indexing

FAQ

Is this insert suitable for all cast‑iron types? The WKK20S grade is formulated for a broad range of cast iron materials; the TNMG220412‑MK5 WKK20S insert handles typical grey and nodular cast irons with effective chip control provided by the MK5 chipbreaker.

How does the MK5 chipbreaker improve machining? The MK5 geometry promotes short, controllable chips in cast‑iron turning, improving surface quality and reducing entanglement risks; this behaviour supports stable cycle times in serial production.

What does the 0° negative rake mean in practice? A 0° negative rake increases edge strength and resistance to mechanical shock, which is advantageous when machining interrupted cuts or hard inclusions commonly found in cast components.

How many usable edges does the insert provide? The triangular 60° shape yields three usable cutting edges per insert, enabling efficient indexing and predictable production costs per edge.

Walter Deutschland GmbH, Derendinger Straße 53, 72072 Tübingen

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