SPGT09T308-MK4 WKK20S Wendeplatten - Walter Tools

Take advantage of the combination of the Tiger·tec Silver coating and the WKK20S grade optimised for cast iron, together with the MK4 chipbreaker for stable chip control and extended tool life; order the insert directly via Metav Werkzeuge or contact the technical advisors for tailored recommendations.

SPGT09T308-MK4 WKK20S — Square turning indexable insert, Tiger·tec Silver, for cast iron — Walter Tools

The SPGT09T308-MK4 WKK20S is a square 90° turning indexable insert designed for robust and consistent machining of cast iron components, utilising the Tiger·tec Silver coated carbide grade for improved wear resistance.

• Tiger·tec Silver coated carbide grade WKK20S
• Optimised for machining cast iron (group K)
• MK4 chipbreaker for reliable chip control
• 0.8 mm nose radius, 11° clearance angle

Stable performance and longer service life through optimised grade and coating

The combination of Tiger·tec Silver coating with the WKK20S grade delivers a balance between abrasion resistance and toughness that is particularly effective when machining cast iron. The coated carbide composition is tailored to resist the abrasive wear typical of cast materials and to cope with frequently short, brittle chips. With the MK4 chipbreaker, the insert supports controlled chip formation, which contributes to predictable tool life and reduced downtime. These technical choices translate into higher process stability and fewer unscheduled tool changes on production lines.

Geometry choices that improve accuracy and surface quality

The insert’s square 90° form and a 0.8 mm nose profile provide a stable cutting geometry for turning operations where a compromise between strength and surface finish is required. The 11° clearance angle reduces rubbing at the flank and helps maintain dimensional accuracy over successive passes. The T3 plate thickness and tolerance class G indicate manufacturing precision and mechanical robustness, supporting consistent seating in toolholders and repeatable results across batches. This geometry is particularly advantageous where predictable tool behaviour and component tolerances are necessary.

Broad application in cast-iron turning with clear technical advantages

Specified for ISO group K, the grade is engineered for the abrasive characteristics of cast iron and the often fragmented chip form encountered in such materials. The insert’s construction and chip management features make it suitable for a range of turning tasks on cast components, from general-purpose machining to more demanding operations that require steady edge performance. By reducing edge deterioration under abrasive conditions, the insert contributes to resource-efficient production and more consistent part quality.

Seamless integration into machining workflows and tool management

The ISO designation supports straightforward identification and ordering within standard tooling systems, and the insert’s format enables reliable indexability and handling in automated environments. The controlled geometry and selection of chipbreaker reduce variability in cutting forces and chip evacuation, which benefits cycle-time planning and downstream processes. Combined with the proven manufacturing tolerance, the component fits well into quality-conscious production setups seeking predictable results and efficient tool usage.

For demanding cast-iron turning, consider Walter Tools' SPGT09T308-MK4 WKK20S with Tiger·tec Silver technology; contact Metav Werkzeuge for technical consultation or ordering at info@metav-werkzeuge.com or +49 2822 7131930

Technical Data

• Article number: SPGT09T308-MK4-WKK20S-WALTER
• Product type: Drehwendeschneidplatte (turning indexable insert)
• Manufacturer: Walter Tools
• Series: Tiger·tec Silver
• Grade: WKK20S

Facts

• Clearance angle: 11°
• Nose radius: 0.8 mm
• Plate form: Square 90°
• Plate size: 09
• Plate thickness: T3
• Tolerance class: G
• Chipbreaker: MK4
• ISO designation: SPGT09T308-MK4 WKK20S

Special features

• Optimised for cast iron (ISO group K)
• Coated carbide technology: Tiger·tec Silver
• Execution: T
• Short designation: SPGT09T308-MK4

FAQ

What materials is this insert suitable for?
The SPGT09T308-MK4 WKK20S insert by Walter Tools is designed primarily for cast iron (ISO group K), reflecting the WKK20S grade’s optimisation for abrasive and short-chip conditions typical of such materials.

What benefits does the MK4 chipbreaker provide?
The MK4 chipbreaker on the SPGT09T308-MK4 WKK20S improves chip control and evacuation, helping to maintain stable cutting conditions and reducing the risk of chip-related interruptions during turning operations.

How does the Tiger·tec Silver coating affect tool life?
The Tiger·tec Silver coating increases wear resistance against abrasive cast-iron workpieces and supports a balanced toughness, which together contribute to longer tool life and more consistent performance under cyclic cutting loads.

What does the 0.8 mm nose radius and 11° clearance deliver in practice?
A 0.8 mm nose radius provides a compromise between edge strength and surface finish, while the 11° clearance reduces flank contact—both factors help to achieve repeatable dimensional accuracy and improved surface quality on turned components.

How is this insert identified for ordering or replacement?
Order or identify the item using the ISO designation SPGT09T308-MK4 WKK20S; this specifies the plate geometry, chipbreaker, and grade for straightforward matching to toolholders and production requirements.

Manufacturer: Walter Deutschland GmbH; Derendinger Straße 53; 72072 Tübingen; Germany

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