VNMA160412-RK5 WKK20S WKK20S Wendeplatten - Walter Tools

Benefit from the combination of a wear-resistant Tiger‑tec Silver grade, the RK5 chipbreaker for controlled chips, and a robust rhombic geometry for reliable cast‑iron turning. Order the insert directly via Metav Werkzeuge or contact our consultants for technical advice.

VNMA160412-RK5 WKK20S — Turning indexable insert with Tiger‑tec Silver coating (Walter Tools)

The VNMA160412-RK5 WKK20S is a rhombic 35° turning insert designed for productive machining of cast iron, offering a 0° negative rake and a 1.2 mm corner radius for stable cutting performance.

• Tiger‑tec Silver coating for extended life
• Optimised RK5 chipbreaker for cast iron
• Rhombic 35° form for versatile turning
• 1.2 mm corner radius for robust edge strength

Consistent chip control for higher process reliability

The combination of the RK5 chipbreaker and the Tiger‑tec Silver grade delivers predictable chip formation when machining cast iron. The chipbreaker is adapted to the short, brittle chips typical of cast materials, which reduces the risk of entanglement and interruptions. Improved chip control leads to fewer downtimes and lower cleaning effort at the machine, which translates into measurable productivity gains on the shop floor.

Coating technology that extends tool life and stability

The insert uses the WKK20S grade within the Tiger‑tec Silver family, a coated cemented carbide designed for abrasive wear conditions encountered in cast‑iron machining. The coating increases resistance to flank and crater wear, so tool life is extended under repetitive, high‑load cuts. For planners and buyers this means a better cost‑per‑part ratio and more consistent batch results across production runs.

Geometry tuned for robust turning and consistent surface quality

A rhombic 35° nose with a 0° negative rake and a 1.2 mm corner radius combines edge strength with stable cutting forces. The geometry supports reliable roughing and semi‑finishing passes: the negative rake reduces the tendency for chipping under interrupted cuts, while the larger corner radius aids in maintaining dimensional stability and improving surface integrity. For operators, the result is fewer insert changes and fewer reworked components.

Clear designation and practical application guidance

The insert is identified as VNMA160412‑RK5 WKK20S and belongs to the Tiger‑tec Silver series; this designation simplifies selection and ordering in tool lists. The grade is intended explicitly for cast iron applications, matching ISO group K requirements. When integrating the insert into existing toolholders, verify compatibility with the VNMA‑style pocket and ensure correct clamping torque to realise the expected repeatability and runout control.

For expert selection and availability of Walter Tools turning inserts in Tiger‑tec Silver, contact Metav Werkzeuge for tailored advice and immediate support

Technical data

• Article number: VNMA160412-RK5-WKK20S-WALTER
• Product name: Drehwendeschneidplatte VNMA160412-RK5 WKK20S Walter Tools
• Manufacturer: Walter Tools
• Product type: Drehwendeschneidplatte
• Series: Tiger‑tec Silver
• Grade: WKK20S

Core data

• Shape: Rhombus 35°
• Corner radius: 1.2 mm
• Size: 16
• Thickness: 04
• Free angle: 0° (negative)
• Tolerance class: M

Special features

• Chipbreaker: RK5
• Coating: Tiger‑tec Silver (WKK20S)
• Material code: K (cast iron application)
• Execution: A
• ISO designation: VNMA160412-RK5 WKK20S
• Cast iron machining capability: yes

FAQ

What materials is this insert suitable for?
The VNMA160412‑RK5 WKK20S is formulated for cast iron machining; the WKK20S grade and RK5 chipbreaker target the abrasive wear and brittle chip behaviour of cast components.

How does the Tiger‑tec Silver coating benefit production?
The Tiger‑tec Silver coating on this Walter Tools insert reduces flank and crater wear, improving tool life and providing more consistent component quality over longer tool cycles.

Which chipbreaker should be chosen for interrupted cuts in cast iron?
The RK5 chipbreaker on this insert is optimised for short, breaking chips typical of cast iron and performs reliably even with partially interrupted cuts.

Is the insert suitable for finishing passes?
With a 1.2 mm corner radius and a rhombic 35° form, the insert delivers robust edge strength; it is suitable for semi‑finishing and many finishing scenarios where edge stability is required.

What does the 0° negative rake mean in practice?
A 0° negative rake provides a stronger cutting edge and reduced susceptibility to chipping on interrupted cuts, improving process security when machining less ductile materials like cast iron.

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

Protected trademarks and trade names are the property of their respective owners. Brand names and registered trademarks are mentioned for explanatory purposes only. There is no affiliation between our company and the named brands. The offered item is original, factory‑new goods of the manufacturer Walter Tools.