SPMW120408T-A27 WKP25S Wendeplatten - Walter Tools

Take advantage of a high-performance, coated insert that combines Tiger·tec Silver wear resistance with the WKP25S grade for reliable machining of steel and cast iron; its square 90° geometry and A27 chipbreaker support consistent chip control and efficient tool life. Order the insert directly via Metav Werkzeuge or consult the specialists for application-specific guidance.

SPMW120408T-A27 WKP25S indexable milling insert — Walter Tools, Tiger·tec Silver, for steel and cast iron

The SPMW120408T-A27 WKP25S is a square indexable milling insert engineered for productive roughing and finishing of steel and cast iron, combining a robust coated substrate with a controlled cutting edge geometry for stable machining.

Tiger·tec Silver coating
Grade WKP25S for steel and cast iron
Square 90° insert, 0.8 mm corner radius
11° clearance, A27 chipbreaker

Consistent chip control for uninterrupted production

The combination of the A27 chipbreaker and the Tiger·tec Silver technology ensures predictable chip formation when machining both steel and cast iron. The engineered groove geometry promotes short, controlled chips that evacuate reliably, lowering the risk of recutting and machine stoppages. For production environments, this translates into fewer interruptions and a more stable cycle time, improving overall throughput.

Longer edge life and reliable wear resistance

The WKP25S grade is a coated cemented carbide that balances toughness and abrasion resistance for mixed applications on P (steel) and K (cast iron) materials. The coating system reduces flank and crater wear under typical milling temperatures, which supports more consistent component quality and extends the interval between indexings or insert changes. This makes the solution cost-effective through extended tool lifetime.

Stable geometry for accurate, repeatable cuts

The square 90° form with a 0.8 mm corner radius and 11° clearance offers a secure cutting edge with good load distribution. The shape provides versatile approach angles for face and shoulder milling while the corner radius contributes to robust edge strength, improving dimensional stability on each pass. These features support repeatable part tolerance and surface integrity in serial production.

Simple integration into existing tool systems

The ISO-style designation matches industry-standard toolholder interfaces, which reduces setup complexity and enables fast replacement during changeovers. The insert’s specification pattern is compatible with common clamping systems used in milling, allowing shops to maintain consistent process parameters and minimise downtime during maintenance or tool swaps.

Practical guidance for material-specific use

The insert is designed for ISO material groups P and K, meaning it is particularly suited to unalloyed and alloyed steel as well as various cast iron grades. In practice, select cutting speeds and feeds according to the workpiece grade and machine rigidity; the WKP25S grade offers a balanced performance window that favours moderate to high metal removal rates while preserving edge life.

Application benefits and quality assurance

Choosing a coated insert from the Tiger·tec Silver series by Walter Tools supports a combination of process reliability and surface finish quality. The insert’s design reduces the likelihood of unexpected edge failure and helps to keep machining outputs within required tolerances, which is vital for repeatable production and downstream assembly processes.

Contact Metav Werkzeuge for application advice and availability of Walter Tools Tiger·tec Silver inserts via info@metav-werkzeuge.com or +49 2822 7131930

Technical data

• SKU: SPMW120408T-A27-WKP25S-WALTER
• Product: Fräswendeschneidplatte (indexable milling insert)
• Brand: Walter Tools
• Series: Tiger-tec Silver
• Grade: WKP25S
• Form: Square 90°
• Chipbreaker: A27
• Version: W

Facts

• Insert size: 12
• Corner radius: 0.8 mm
• Clearance angle: 11°
• Thickness designation: 04
• Tolerance class: M

Special features

• Coating: Tiger·tec Silver
• Material suitability: P / K (steel and cast iron)
• Application: general milling operations (catalogue-/geometry-dependent)
• Designation without grade: SPMW120408T-A27

FAQ

Which materials is this insert suitable for?
The SPMW120408T-A27 WKP25S insert is suitable for steel (ISO group P) and cast iron (ISO group K), reflecting the WKP25S grade’s balance between toughness and abrasion resistance.

What does the A27 chipbreaker do?
The A27 chipbreaker on this Walter Tools milling insert promotes controlled, short chip formation, improving chip evacuation and reducing the risk of recutting during milling of steel and cast iron.

How does the Tiger·tec Silver series improve performance?
Tiger·tec Silver provides an advanced coating system that enhances wear resistance and thermal stability, leading to longer edge life and more consistent surface finish when using the WKP25S grade.

Is the square 90° geometry suitable for shoulder milling?
Yes, the square 90° form with a 0.8 mm corner radius provides robustness for shoulder and face milling, offering good load distribution and repeatable dimensional results.

How to interpret the insert designation SPMW120408T-A27?
The designation encodes the geometry and chipbreaker: it identifies the square insert form, nominal size, thickness class and the A27 chipbreaker used on the WKP25S grade for Walter Tools milling applications.

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

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