CCMT120408-RK4 WKK20S WKK20S Wendeplatten - Walter Tools

Take advantage of the proven combination of Tiger·tec Silver coating and an RK4 chipbreaker to achieve stable chip control and long tool life when machining cast iron; order directly via Metav Werkzeuge or consult their tooling specialists for on‑site process recommendations.

CCMT120408-RK4 WKK20S – Turning/Boring Insert (Rhombic 80°, Walter Tools)

The CCMT120408-RK4 WKK20S is a rhombic 80° indexable insert designed for productive turning and boring of cast iron components using Tiger·tec Silver coating.

• Tiger·tec Silver coated carbide grade WKK20S
• Optimised RK4 chipbreaker for cast iron
• Rhombic 80° insert with 0.8 mm corner radius
• 7° clearance angle for stable cutting

Durable coating for abrasive cast‑iron machining

The combination of the Tiger·tec Silver coating and the WKK20S grade delivers high wear resistance tailored to abrasive cast‑iron materials. This coated carbide technology reduces flank wear under typical cast‑iron cutting conditions and extends cutting edge life, which translates into fewer insert changes and increased uptime. The description “K” indicates suitability for cast iron according to ISO groupings, ensuring the material pairing is optimised for the common breakable chips and abrasive particles encountered in grey and ductile cast irons.

Reliable chip control that reduces downtime

The integrated RK4 chipbreaker is engineered to form short, controllable chips with cast iron, improving chip evacuation and reducing the risk of tangling. Chip control directly affects cycle stability; with predictable chips the machining process runs more consistently and coolant or evacuation systems operate more effectively. For users less familiar with chipbreaker types: an RK4 design moderates chip curl and break, making it especially useful in automatic and semiautomatic lathes where consistent evacuation is critical.

Geometry that enhances stability and surface quality

The rhombic 80° shape combined with a 0.8 mm corner radius and 7° clearance angle provides a robust cutting edge for interrupted cuts and facing operations. The insert geometry balances edge strength and accessibility: the 80° approach angle offers secure seating in toolholders while the 0.8 mm radius helps achieve a good surface finish without sacrificing edge durability. These geometric choices support repeatable results in series production and reduce the frequency of insert indexing.

Application advice and process benefits

Designed primarily for cast iron turning, this insert supports productive machining strategies where long tool life and consistent results matter. The coated microstructure of WKK20S and the optimised chipformer contribute to stable material removal rates and predictable tool wear. For machining parameter selection, start with conservative feeds and speeds typical for cast iron and adjust to the machine rigidity and toolholder setup; the insert tolerates typical shop interruptions and maintains a reliable cutting edge across varied cast‑iron grades.

For machining cast iron with Walter Tools' Tiger·tec Silver technology, contact Metav Werkzeuge for specific cutting data and application advice at info@metav-werkzeuge.com or call +49 2822 7131930

Technical data

• Article number: CCMT120408-RK4-WKK20S-WALTER
• Designation: CCMT120408-RK4 WKK20S
• Manufacturer: Walter Tools
• Series: Tiger·tec Silver

Facts

• Insert shape: Rhombic 80°
• Inscribed circle / size: 12
• Thickness: 04
• Corner radius: 0.8 mm
• Clearance angle: 7°
• Tolerance class: M

Special features

• Coating: Tiger·tec Silver
• Grade: WKK20S (coated carbide)
• Chipbreaker: RK4
• Material application: cast iron-compatible (ISO group K)
• Plate form: Rhombus 80°
• Suitability: productive turning and boring of cast iron

FAQ

What materials is this insert intended for?
The CCMT120408-RK4 WKK20S insert is formulated for machining cast iron (ISO group K) and performs well with abrasive, breakable chip behaviours typical of these materials.

How does the RK4 chipbreaker affect machining?
The RK4 chipbreaker on this cutting insert produces short, controlled chips, improving evacuation and process stability when turning cast iron.

Can the insert handle interrupted cuts?
Yes, the rhombic 80° geometry and 0.8 mm corner radius give the insert sufficient edge strength for interrupted cuts and facing operations.

Is the Tiger·tec Silver coating beneficial for hard or abrasive workpieces?
Tiger·tec Silver coating increases wear resistance and thermal stability, making the insert particularly effective for abrasive cast‑iron applications and extended tool life.

Which toolholder types are compatible with this insert shape?
The rhombic 80° format is compatible with standard indexable turning and boring toolholders designed for CCMT‑style inserts; ensure the holder matches the insert seat and clamp style.

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

Protected trademarks and trade names remain the property of their respective owners. Brand names and registered trademarks are mentioned for explanatory purposes only and indicate no affiliation between Metav Werkzeuge and the listed manufacturers. The offered article is an original, factory‑new product of the named manufacturer.