P4840C-3R-E77 WNN15 Wendeplatten - Walter Tools

Benefit from the WNN15 coated carbide for improved edge life and the 3R‑E77 chipbreaker for consistent chip control; combine these features for reliable drilling and reaming performance and order directly via Metav Werkzeuge or consult our specialists for selection guidance.

P4840C-3R-E77 WNN15 drilling/reaming indexable insert — 3R‑E77 chipbreaker, coated carbide (Walter Tools)

The P4840C-3R-E77 WNN15 is an indexable insert for drilling and reaming applications, engineered to deliver stable cutting behaviour and predictable tool life in production machining.

• Coated carbide grade WNN15
• 3R‑E77 chipbreaker geometry
• Open‑series Walter grade
• Designed for productive cutting

Longer tool life through a tailored carbide grade

The WNN15 grade is a coated carbide formulation developed for a balance of wear resistance and edge toughness. In practical terms, this means fewer insert changes and extended intervals between regrinds, which directly improves machine uptime and reduces handling costs. As an indexable insert, the P4840C‑3R‑E77 minimises setup time compared with brazed or solid tooling; the replaceable cutting edge ensures consistent geometry and edge stability across repeated operations. For best results, the material suitability should be verified against the official product matrix.

Consistent chip control for safer, faster cycles

The 3R‑E77 chipbreaker geometry is designed to support controlled chip formation during drilling and reaming cycles, helping to avoid long, stringy chips that can foul the tool or workpiece. Effective chip control improves coolant access, reduces heat concentration at the cutting edge and supports higher feed rates where process windows permit. In short, the geometry contributes to process reliability and predictable cycle times, making the insert well suited to serial production where repeatability matters.

Integration into productive machining processes

As part of the open‑series Walter grade range, this insert integrates with standard indexable toolholders for drilling and reaming operations on CNC platforms. The specification prioritises productive cutting and easy handling: replaceable inserts reduce downtime and simplify inventory management. Users with varying levels of experience will appreciate the straightforward replacement routine and the performance consistency that comes from a recognised cutting‑tool brand.

Application guidance and selection notes

The insert is intended for drilling and reaming tasks; selection of feeds, speeds and depth per pass should follow the machine manufacturer’s recommendations and the insert’s application matrix. The product description indicates coated carbide and the 3R‑E77 chipbreaker as defining features — check the official matrix for specific workpiece materials and machining strategies. Walter Tools’ engineering focus on stable cutting and good surface finish supports a wide range of industrial uses in metalworking, especially where repeatable hole quality and process stability are priorities.

For tailored advice on using Walter Tools inserts like the P4840C‑3R‑E77 WNN15, contact Metav Werkzeuge at info@metav-werkzeuge.com or call +49 2822 7131930 to discuss application requirements and availability

Technical data

• SKU: P4840C-3R-E77-WNN15-WALTER
• Label: Bohr-/Aufbohrwendeschneidplatte P4840C-3R-E77 WNN15 Walter Tools
• Product type: drilling/reaming indexable insert
• Manufacturer: Walter Tools
• Designation: P4840C-3R-E77 WNN15
• Series: Walter Schneidstoffsorte - Serie offen
• Chipbreaker: 3R‑E77
• Material description: Katalogabhängig

Facts

• No measurable numerical characteristics provided in the source data

Special features

• Coated carbide grade WNN15
• Chipbreaker geometry 3R‑E77 for chip control
• Open series Walter grade for general machining
• Intended use: drilling and reaming operations
• Material suitability: verify in the product matrix

FAQ

What workpiece materials can this insert machine effectively?
Material suitability must be checked in the product matrix; the P4840C‑3R‑E77 WNN15 is a coated carbide insert intended for a range of metalworking tasks, but specific alloys and hardness levels require confirmation.

What does the 3R‑E77 chipbreaker provide in drilling applications?
The 3R‑E77 geometry promotes controlled chip formation and evacuation during drilling and reaming, supporting stable cutting, reduced heat concentration and improved cycle repeatability with the Walter Tools insert.

Is this insert suitable for finishing passes?
The insert is designed primarily for drilling and reaming; finishing performance depends on the chosen feeds and speeds and the workpiece material — consult the product matrix to verify suitability for fine finishing.

How does the WNN15 grade affect productivity?
WNN15 is a coated carbide grade that balances wear resistance and toughness to extend tool life and reduce indexable insert changes, which in turn supports higher production efficiency when used within recommended parameters.

Which toolholders are compatible with this indexable insert?
The P4840C‑3R‑E77 format is intended for standard indexable drilling and reaming toolholders; confirm holder compatibility by matching the insert designation and seating geometry as specified by the tooling system.

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

Protected trademarks and brand names mentioned are the property of their respective owners. Brand names and registered trademarks are used solely for identification and explanation. There is no affiliation between our company and the named brands. The offered item is an original, brand‑new product from the manufacturer (Walter Tools).