TNMG270612-MK5 WKK20S WKK20S Wendeplatten - Walter Tools

Take advantage of the combination of stable chip formation, longer edge life and a coating optimised for abrasive materials to boost throughput in cast iron turning. Benefit from the Tiger‑tec Silver grade WKK20S for consistent results and order the insert directly via Metav Werkzeuge or consult our specialists for application support.

TNMG270612‑MK5 WKK20S – Indexable turning insert for cast iron (Tiger‑tec Silver) by Walter Tools

The TNMG270612‑MK5 WKK20S is a triangular 60° indexable turning insert designed for productive machining of cast iron components, combining a robust chipbreaker with a coating tuned for abrasive wear

• Tiger‑tec Silver coating technology
• WKK20S grade optimised for cast iron
• Triangle 60° insert with 1.2 mm nose radius
• 0° negative rake for stable cutting

Increased productivity through abrasion‑resistant grade and geometry

The TNMG270612‑MK5 WKK20S is developed to address the specific challenges of cast iron machining. The WKK20S grade of the Tiger‑tec Silver family is a coated carbide formulation that resists abrasive wear and maintains edge integrity in interrupted and breaking‑chip conditions. The triangular 60° geometry yields three usable cutting edges per index, reducing tool change frequency and supporting higher machine uptime. For production environments where consistent cycle times and fewer regrinds matter, this insert offers a clear reduction in downtime and a measurable uplift in process efficiency.

Consistent surface quality and controlled chips for safer productivity

The MK5 chipbreaker is tailored to the short, brittle chips typical of cast iron; it supports reliable chip segmentation and evacuation, lowering the risk of chip entanglement and tool nose rubbing. Combined with the 1.2 mm nose radius, the insert balances edge strength with the ability to produce stable surface finishes on turned components. The 0° negative rake increases cutting edge robustness during heavy cuts, resulting in fewer rejects and less downstream finishing. This combination translates into lower machining variability and reduced rework rates.

Lower tooling costs through modern coating and edge stability

The Tiger‑tec Silver coating improves resistance to thermal and abrasive wear, which extends effective tool life under typical cast iron conditions. A longer‑lasting cutting edge reduces the frequency of indexing and regrinding, improving cost per part and contributing to predictable production planning. Because the sort is engineered for abrasive materials, it helps avoid premature microchipping and keeps process windows stable — a pragmatic advantage for batch or continuous manufacturing where tool‑life consistency directly affects overall cost efficiency.

Integration into standard turning systems and clear application scope

The insert is offered in the common TNMG format and is compatible with a wide range of toolholders that accept triangular 60° inserts, simplifying inventory and holder management. Marked by tolerance class M and the MK5 chipbreaker, the geometry and mechanical tolerances support repeatable seating and stable clamping forces. The grade is explicitly suited to ISO group K (cast iron) applications, making material selection straightforward for planning and programming. Clear material assignment reduces trial‑and‑error and accelerates the qualification of cutting data for production runs.

Discuss machining requirements with Metav Werkzeuge to select the optimal Walter Tools Tiger‑tec Silver inserts for cast iron operations; Metav Werkzeuge can advise on grade selection and holder compatibility

Technical data

• Article number: TNMG270612‑MK5‑WKK20S‑WALTER
• Manufacturer: Walter Tools
• Product type: Indexable turning insert

Facts

• Insert size: 27
• Nose radius: 1.2 mm
• Plate form: Triangle 60°
• Rake: 0° negative
• Tolerance class: M
• Grade: WKK20S

Special features

• Series: Tiger‑tec Silver
• Chipbreaker: MK5
• Coating: coated carbide
• Material suitability: cast iron (ISO K)
• Execution: G
• Plate thickness code: 06

FAQ

What materials is this insert intended for?
The TNMG270612‑MK5 WKK20S insert from Walter Tools is specifically designed for cast iron machining (ISO group K), with a grade and chipformer matched to abrasive, breaking chips

How does the MK5 chipbreaker affect machining?
The MK5 chipbreaker promotes short, controlled chip formation and reliable evacuation when turning cast iron, which supports stable surface finish and reduces the risk of chip interference

What benefits does the Tiger‑tec Silver coating provide?
The Tiger‑tec Silver coating enhances abrasion resistance and thermal stability, extending edge life under the abrasive conditions typical of cast iron turning

Manufacturer/Responsible: Walter AG (Walter Tools); Tübingen, Germany

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