SCMT120404-RK4 WKK20S RK4 Wendeplatten - Walter Tools

Take advantage of the combination of reliable wear resistance and precise chip control to maintain steady production when machining cast iron; order the insert through Metav Werkzeuge or consult their specialists for application advice.

SCMT120404-RK4 WKK20S – Square 90° indexable insert, RK4 chipbreaker, Tiger·tec Silver, Walter Tools

SCMT120404-RK4 WKK20S is a square 90° indexable insert intended for turning and drilling-related applications, optimised for abrasive cast iron machining.

• Tiger·tec Silver coating for high wear resistance
• Optimised for abrasive cast iron machining
• RK4 chipbreaker for controlled, short chips
• Square 90° form with 0.4 mm corner radius

Greater tool life through a coating engineered for abrasive materials

The WKK20S grade in the Tiger·tec Silver series is a coated carbide grade developed specifically for cast iron applications. Its coating provides enhanced abrasion resistance, which translates into longer tool life and fewer index changes in serial production. For sectors where interrupted cuts and brittle, breaking chips are common, this grade stabilises the machining process and reduces unplanned downtime. The use of a purpose-made grade means predictable wear behaviour and improved process reliability when machining gray and other cast irons.

Reliable chip control for safer, reproducible machining

Equipped with the RK4 chipbreaker, the insert delivers consistent, short chip forms that are easier to evacuate from the cutting zone. This chip control reduces the risk of tool damage and workpiece marks, making it suitable for automated setups and unmanned shifts. The square 90° geometry combined with a 0.4 mm corner radius provides a secure cutting edge for shoulder cuts and stable plunge operations, improving repeatability and surface integrity on cast iron components.

Geometry and relief designed for stable cutting conditions

The insert’s geometry — a square 90° form with SCMT designation — and a 7° relief angle reduce rubbing and minimise radial cutting forces during engagement. The 12 mm size and thickness code “04” signal compatibility with standard SCMT toolholders designed for heavy-duty and light-precision tasks. These geometric choices help achieve uniform load distribution on the cutting edge, which supports steady cutting behaviour across batches and contributes to consistent dimensional accuracy.

Cost-efficiency through fewer tool changes and predictable performance

Choosing a grade and geometry optimised for abrasive materials lowers the total cost per part: fewer index changes, less scrap from poor chip evacuation, and more predictable service intervals. The combination of coated carbide material and a robust chipbreaker reduces unplanned stoppages and streamlines shop-floor scheduling. For production environments prioritising throughput and repeatability, this insert helps keep machining cycles efficient while maintaining surface quality.

For application-specific recommendations and to discuss suitable toolholder pairings for Walter Tools’ Tiger·tec Silver inserts, contact Metav Werkzeuge — Metav Werkzeuge GmbH is available at info@metav-werkzeuge.com or by phone on +49 2822 7131930

Technical data

• SKU: SCMT120404-RK4-WKK20S-WALTER
• Designation: SCMT120404-RK4 WKK20S
• Product type: Bohr-/Aufbohrwendeschneidplatte / Drehwendeschneidplatte
• Manufacturer: Walter Tools

Facts

• Size: 12 mm
• Thickness code: 04
• Corner radius: 0.4 mm
• Relief angle: 7°
• Insert form: Square 90°
• Tolerance class: M

Special features

• Series: Tiger·tec Silver
• Grade: WKK20S (coated carbide)
• Chipbreaker: RK4
• Material application: cast iron (K)
• ISO-compatible SCMT geometry

FAQ

What materials is this insert suitable for?
The SCMT120404-RK4 WKK20S insert from Walter Tools is optimised for machining cast iron, with the WKK20S grade specifically formulated for abrasive cast iron conditions.

What benefit does the Tiger·tec Silver coating provide?
The Tiger·tec Silver coating on the WKK20S grade enhances abrasion resistance, which increases tool life and supports stable performance when machining abrasive cast iron materials.

How does the RK4 chipbreaker affect machining?
The RK4 chipbreaker produces controlled, short chips that improve chip evacuation and reduce the risk of tool and workpiece damage during turning and drilling-related operations.

Is the insert suitable for automated or unmanned machining?
Yes, the combination of consistent chip control and a wear-resistant grade makes this insert well suited for automated processes where predictable chip formation and extended tool life are required.

Which geometry and dimensions are specified for this insert?
The insert follows SCMT geometry with a square 90° form, 0.4 mm corner radius and a 7° relief angle; the designated size is 12 mm.

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

The Walter AG (brand appearance: Walter Tools) with its headquarters in Tübingen is one of the world’s leading manufacturers of precision tools for metalworking and is part of the Sandvik Group. Protected trademarks and trade names remain the property of their respective owners and are mentioned solely for explanation. There is no affiliation between our company and the named brands. The offered item is an original, factory-new product of the manufacturer.