SNMA120412-RK7 WKK20S WKK20S Wendeplatten - Walter Tools

Take advantage of the combination of Tiger·tec Silver coating, the wear-resistant WKK20S grade and the RK7 chipbreaker to boost process stability and reduce insert changes; order directly via Metav Werkzeuge or request application advice from our consultants.

SNMA120412-RK7 WKK20S indexable turning insert — Walter Tools, Tiger·tec Silver, for cast iron, RK7 chipbreaker

A SNMA120412-RK7 WKK20S indexable turning insert engineered for reliable machining of abrasive cast iron, combining a robust square geometry with advanced coating technology for consistent chip control and extended tool life.

• Tiger·tec Silver coated grade WKK20S
• Optimised RK7 chipbreaker for cast iron
• Square 90° insert with 1.2 mm nose radius
• 0° negative rake for stable cutting

Stable chip control and longer tool life for cast iron

The combination of the WKK20S cutting grade and Tiger·tec Silver coating delivers enhanced wear resistance specifically tailored to abrasive cast iron (ISO group K). The RK7 chipbreaker is optimised to handle the short, brittle chips typical of these materials, reducing the risk of built-up edge and minimising interruptions from chip-related issues. As a result, cycle times become more predictable and the number of insert changes is reduced, which contributes directly to improved productivity on the shop floor.

Geometry and edge preparation that support repeatable results

A square, 90° insert form with a 1.2 mm nose radius provides a balance between strength and surface finish. The 0° negative rake geometry increases stability in interrupted cuts and heavy-duty turning, helping to preserve the cutting edge under demanding conditions. Together these design choices ensure consistent dimensional accuracy and repeatable surface quality in serial production, while the insert’s robust form tolerates modest variations in clamping and tool-holder setup without rapid deterioration.

Practical benefits for production efficiency

Selecting this insert reduces downtime through fewer tool changes and predictable wear behaviour. The Tiger·tec Silver coating improves thermal resistance and fracture toughness, which is especially beneficial when machining abrasive cast iron grades. With a focus on process reliability, the insert’s combination of chip control and wear resistance supports longer uninterrupted production runs and lower overall tooling costs per component—advantages that are measurable across batch production and single-shift operations alike.

Recommended use and integration into tooling systems

The insert is intended for turning applications on cast iron where robust chip breaking and edge security are priorities. Its square 90° form and RK7 chipbreaker suit both roughing and medium finishing operations when paired with appropriate turning holders and stable machine set-ups. For best results, match cutting parameters to workpiece grade and machine capability; when in doubt, consult the application specialists at Metav Werkzeuge for tailored recommendations to ensure optimal integration into existing tool systems.

For tailored application advice and rapid supply of Walter Tools inserts such as the SNMA120412-RK7 WKK20S, contact Metav Werkzeuge for expert support and order coordination.

Technical data

• Article number: SNMA120412-RK7-WKK20S-WALTER
• Designation: SNMA120412-RK7 WKK20S
• Manufacturer: Walter Tools
• Product type: indexable turning insert

Core data

• Insert size: 12
• Nose radius: 1.2 mm
• Thickness: 04
• Free rake angle: 0° (negative)
• Form: square 90°
• Tolerance class: M

Special features

• Coating: Tiger·tec Silver
• Grade: WKK20S
• Chipbreaker: RK7
• Series: Tiger·tec Silver
• Suitable for: cast iron (ISO K)
• Execution: A

FAQ

What materials is this insert suitable for?
The SNMA120412-RK7 WKK20S insert is designed primarily for machining cast iron (ISO group K), with the WKK20S grade and RK7 chipbreaker tuned to the abrasive and brittle chip characteristics of these materials.

How does the Tiger·tec Silver coating help in practice?
The Tiger·tec Silver coating on the SNMA120412-RK7 WKK20S enhances thermal and wear resistance, improving edge life under the high abrasion typical of cast iron and contributing to more consistent tool performance.

What is the purpose of the RK7 chipbreaker?
The RK7 chipbreaker promotes controlled fragmentation of short, brittle chips common in cast iron, reducing chip entanglement and supporting safer, more reliable chip evacuation during turning.

Can this insert be used for finishing operations?
Yes; the square 90° geometry with a 1.2 mm nose radius allows the SNMA120412-RK7 WKK20S to perform medium finishing in addition to robust roughing, provided cutting parameters and holder rigidity are appropriate.

How should the insert be clamped and oriented in the tool holder?
Use a compatible negative insert holder that secures square 90° inserts; the SNMA120412-RK7 WKK20S benefits from rigid clamping and minimal overhang to fully exploit its 0° negative rake stability.

Walter Tools; Walter Deutschland GmbH, Derendinger Straße 53, 72072 Tübingen, Germany

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