SPGT09T304-MK4 WKK20S WKK20S Wendeplatten - Walter Tools

Take advantage of the combination of high abrasion resistance, consistent chip control and cast-iron optimisation for steady turning performance and predictable tool life; order directly via Metav Werkzeuge or consult our technical advisors for tailored cutting data.

SPGT09T304-MK4 WKK20S — Indexable turning insert, Tiger·tec Silver, for cast iron, Walter Tools

The SPGT09T304-MK4 WKK20S is a square 90° indexable turning insert designed for productive machining of cast iron components, offering a wear-resistant coating and a specialised chipbreaker for stable cutting.

*Tiger·tec Silver coating for high wear resistance
*Optimised for cast iron machining (ISO group K)
*MK4 chipbreaker for stable chip control
*Square 90° geometry with 0.4 mm corner radius

Greater efficiency through a purpose-built cutting grade

The WKK20S grade, part of the Tiger·tec Silver series, is a coated carbide development tuned specifically to withstand the abrasive wear typical of cast iron machining. Coatings of this type combine a hard, wear-resistant surface with a tough substrate to reduce crater and flank wear under interrupted and continuous cuts. For production environments where cycle times and insert life are critical, the coated grade offers a measurable advantage: fewer indexings, more consistent component tolerances and less unscheduled tool changeover, which directly supports throughput and cost efficiency.

Predictable chips and improved surface quality from controlled geometry

A MK4 chipbreaker and the square 90° form deliver consistent chip formation and evacuation when turning grey and nodular cast irons. The insert’s 11° clearance angle and 0.4 mm corner radius balance strength and accessibility: the radius protects the cutting edge in heavy cuts while the clearance reduces rubbing and heat generation. Stable chips reduce workpiece rework and improve surface finish, and the MK4 geometry is particularly effective where short, breaking chips are required. This results in a reliable process window and reduced cycle variation on repetitive parts.

Easy integration into existing toolholders and process planning

The designation SPGT09T304-MK4 WKK20S corresponds to common ISO insert dimensions and a T3 thickness, which simplifies retrofitting into standard turning toolholders that accept 90° square inserts. The insert is aimed at workshops and production lines working primarily in ISO group K materials, offering a pragmatic balance between toughness and abrasion resistance. For new applications or process optimisation, the technical team at Metav Werkzeuge can assist with recommended cutting parameters and holder selection to ensure the grade’s benefits are realised in practice.

Contact Metav Werkzeuge for tailored cutting data, availability of the SPGT09T304-MK4 WKK20S insert from Walter Tools or to request recommended speeds and feeds for specific cast-iron applications — email info@metav-werkzeuge.com or call +49 2822 7131930

Technical data

• Article number: SPGT09T304-MK4-WKK20S-WALTER
• Designation: SPGT09T304-MK4
• ISO designation: SPGT09T304-MK4 WKK20S
• Manufacturer / Brand: Walter Tools
• Product type: Indexable turning insert

Core specifications

• Clearance angle: 11°
• Corner radius: 0.4 mm
• Insert size: 09
• Thickness: T3
• Tolerance class: G

Design & special features

• Coating: Tiger·tec Silver
• Grade: WKK20S (coated carbide)
• Chipbreaker: MK4
• Geometry: Square 90°
• Series: Tiger-tec Silver
• Application group: K (cast iron)
• Execution: T

FAQ

Is this insert suitable for different types of cast iron?
The SPGT09T304-MK4 WKK20S insert and its WKK20S grade are tailored for ISO group K materials, covering typical grey and nodular cast irons where abrasive wear and short, breaking chips are common.

What benefits does the Tiger·tec Silver coating bring?
The Tiger·tec Silver coating on the WKK20S grade increases wear resistance and extends tool life under the abrasive conditions encountered when machining cast iron, improving process stability.

How does the MK4 chipbreaker affect machining?
The MK4 chipbreaker produces controlled, predictable chips and supports secure evacuation, which reduces interruptions and helps maintain consistent surface quality when turning cast iron.

Can the insert be used in standard 90° turning holders?
Yes, the SPGT09T304-MK4 form is a square 90° insert with a common ISO designation and T3 thickness, making it compatible with standard holders designed for this insert geometry.

Protected trademarks and trade names are the property of their respective owners. Brand names and protected trademarks are mentioned for explanatory purposes only. There is no affiliation between our company and the mentioned brands; the offered item is an original, factory-new product of the manufacturer. Walter Tools: Walter Deutschland GmbH; Derendinger Straße 53; 72072 Tübingen; Germany