P4840P-7R-E77 WNN15 WNN15 Wendeplatten - Walter Tools

Benefit from the combination of a dedicated WNN15 coated carbide grade and the 7R-E77 chipbreaker geometry to increase productivity and process stability in drilling and boring operations; order directly via Metav Werkzeuge or consult our technical team for material suitability.

P4840P-7R-E77 WNN15 Drilling/Boring Indexable Insert — Coated carbide, 7R-E77 chipbreaker | Walter Tools

The P4840P-7R-E77 WNN15 is an indexable insert developed for drilling and boring tasks, optimised for productive chip formation and stable cutting in a wide range of machining processes

• Coated carbide grade WNN15
• 7R-E77 chipbreaker geometry
• Open-series Walter grade for versatility
• Indexable insert for drilling and boring

Consistent cutting performance through a dedicated coated grade

The combination of the WNN15 grade and a coating system (catalog-dependent) provides a balance between wear resistance and cutting-edge stability. This coated carbide grade is designed to deliver reproducible tool life under varied cutting conditions; the result is fewer tool changes and a more continuous production flow. For decision-making, the material fit should be confirmed via the supplied product matrix, since WNN15 is optimised for specific workpiece groups rather than every application.

Chip control engineered for efficient material removal

The 7R-E77 chipbreaker geometry focuses on reliable chip control, reducing the risk of built-up edge and improving surface finish during both drilling and light boring. Controlled chip formation leads to lower thermal load on the cutting edge and more predictable cutting forces, which supports higher throughput and process security. This geometrical solution is particularly useful where evacuation of swarf is critical to avoid recutting or spindle interruptions.

Series design for flexible workshop integration

Belonging to the open-series Walter grade, the insert is intended for versatile deployment in standard toolholders and drilling systems. The design emphasises compatibility and straightforward handling as an indexable insert, minimising setup complexity. While the base geometry supports efficient use in many systems, compatibility and exact clamping specifications should be checked against the machine and holder documentation prior to selection.

Practical guidance for selection and application

The insert is supplied under the designation P4840P-7R-E77 WNN15 and is best selected after consulting the product matrix that links grade, geometry and recommended cutting data. Where high process reliability and consistent surface quality are priorities, this insert represents a pragmatic choice owing to the Walter Tools development focus on stable cutting behaviour and reproducible results. For specialised materials or higher-hardness applications, cross-reference with the technical matrix is advised.

For tailored advice on integrating the Walter Tools P4840P-7R-E77 WNN15 into existing setups or to request the product matrix, contact Metav Werkzeuge at info@metav-werkzeuge.com or call +49 2822 7131930

Technical Data

• Article number: P4840P-7R-E77-WNN15-WALTER
• Designation: P4840P-7R-E77 WNN15
• Type: Drilling/Boring indexable insert

Facts

• No numerical specifications provided in the data

Special features

• Grade: WNN15 (coated cemented carbide)
• Chipbreaker: 7R-E77
• Series: Walter Schneidstoffsorte - Serie offen
• Catalogue-dependent coating and material details

FAQ

What materials is this insert suitable for?
Selection depends on the material matrix; the P4840P-7R-E77 WNN15 is a coated carbide grade intended for a defined range of workpiece materials, so compatibility should be checked against the product matrix before use.

What does the 7R-E77 designation mean?
The 7R-E77 identifier denotes the chipbreaker geometry optimised for controlled swarf formation and evacuation in drilling and boring operations, improving surface finish and tool life.

Is the insert designed for both drilling and boring?
Yes, the insert is specified as a drilling/boring indexable insert and is engineered to deliver stable cutting behaviour in both types of operations when used with appropriate toolholders.

How should cutting data be determined for this grade?
Cutting data should be taken from the Walter product matrix for WNN15 and adapted to the machine, holder and workpiece conditions; the matrix provides recommended speeds and feeds for typical applications.

Can this insert be used for high-volume production?
The combination of a coated carbide grade and the 7R-E77 chipbreaker supports productive machining and reproducible results, making the insert suitable for high-volume production where the material and conditions match the product matrix recommendations.

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