CNMA120412-RK7 WKK20S WKK20S Wendeplatten - Walter Tools

Take advantage of the combination of industrial-grade coating, a dedicated chipbreaker and robust geometry to ensure stable, productive turning of cast iron components; order the CNMA120412-RK7 WKK20S insert via Metav Werkzeuge or consult our specialists for cutting-data sheets and process recommendations.

CNMA120412-RK7 WKK20S Turning Indexable Insert — Tiger·tec Silver, for cast iron | Walter Tools

CNMA120412-RK7 WKK20S is a turning indexable insert designed for reliably machining cast iron in production turning applications

• CNMA120412-RK7 WKK20S insert, Tiger·tec Silver
• Optimised for cast iron (ISO group K)
• Rhombic 80° form, 1.2 mm nose radius
• Negative 0° rake, RK7 chipbreaker for reliable chips

Consistent wear control for cast iron turning

The combination of Tiger·tec Silver coating and the WKK20S grade provides outstanding wear resistance under the abrasive conditions typical of cast iron. The coating system reduces flank wear and maintains edge strength over longer tool life, which translates into fewer index changes and higher productive cutting hours. The supplied chip control geometry, marked RK7, is tuned to produce short, controllable chips with cast materials, reducing the risk of unexpected chip jams and improving process stability on serial turning operations.

Geometry that balances strength and surface quality

The Rhombic 80° profile with a 1.2 mm nose radius gives a robust cutting edge while still permitting a good surface finish on cast iron components. A larger nose radius supports higher feed rates with reduced vibration, whereas the defined corner radius protects the edge from impact and abrasive wear. The negative 0° rake offers additional rigidity in interrupted cuts and hard zones often encountered in castings, so the toolholder-insert system remains stable during heavy-duty turning cycles.

Productivity gains and predictable performance

For production shops machining cast iron, the insert’s combination of coated carbide substrate and tailored chipbreaker reduces downtime and contributes to reproducible results. The WKK20S grade is formulated specifically for ISO group K materials, giving shops reliable cutting parameters and predictable tool life. Process planners benefit from straightforward grade assignment and easier optimisation of cutting speeds and feeds, which supports higher throughput and consistent component quality in both batch and continuous manufacture.

Contact Metav Werkzeuge today to discuss how the CNMA120412-RK7 WKK20S insert can improve cast iron turning performance and to request cutting-data recommendations by e‑mail (info@metav-werkzeuge.com) or by phone (+49 2822 7131930).

Technical data

• Article number: CNMA120412-RK7-WKK20S-WALTER
• Type designation: CNMA120412-RK7 WKK20S
• Manufacturer: Walter Tools
• Series: Tiger·tec Silver

Core specifications

• Size: 12
• Plate thickness: 04
• Corner radius: 1.2
• Plate form: Rhombus 80°
• Rake angle: 0° (negative)
• Tolerance class: M

Materials & features

• Coating / grade: WKK20S (Tiger·tec Silver)
• Chipbreaker: RK7
• Substrate / material code: K (cast iron)
• Execution: A
• ISO designation: CNMA120412-RK7 WKK20S

FAQ

What materials is this insert intended for?
The CNMA120412-RK7 WKK20S insert is optimised for cast iron (ISO group K) and its chipformer and grade are matched to the abrasive and often brittle nature of cast materials.

How does the RK7 chipbreaker help in production?
The RK7 chipbreaker promotes short, controllable chips on cast iron, reducing chip entanglement and improving process security during serial turning operations.

Can the Tiger·tec Silver grade be used for heavy interrupted cuts?
Yes — the combination of the Tiger·tec Silver coating and the insert’s negative 0° rake provides enhanced edge stability suitable for interrupted and demanding turning conditions in cast iron workpieces.

What surface finish can be expected with the 1.2 mm radius?
The 1.2 mm nose radius balances edge strength and finish: it supports higher feedrates with reduced vibration while still achieving consistent component surfaces in production turning.

Which designation should be requested when ordering?
Order using the full designation CNMA120412-RK7 WKK20S (Walter Tools) to ensure the correct grade, chipbreaker and geometry are supplied.

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

The Walter AG (brand presentation: Walter Tools) with headquarters in Tübingen is one of the world’s leading manufacturers of precision tools for metalworking and is part of the Swedish Sandvik group. Protected trademarks and trade names are the property of their respective owners. Brand names and protected designations are mentioned for explanatory purposes only; there is no affiliation between our company and the named manufacturers. The offered item is an original, factory-new product of the manufacturer.