Walter-prototyp 8417750 Corner Radius End Mill 5 Flute

Product Description

The WALTER-PROTOTYP 8417750 is a solid carbide corner radius end mill engineered for demanding material removal in superalloys, titanium, stainless steel, and general steel applications. It features a 3/4 inch cutting diameter, a 0.1900 inch corner radius, and 5 flutes with a 38-degree helix angle for aggressive chip evacuation and stable cutting performance. The nACRo (WJ30EN) coating provides thermal resistance and wear protection at elevated cutting temperatures common in hard-material machining. This tool is single-end, centercutting, and configured for both roughing and finishing operations. It is installed and run by machinists and CNC programmers in job shop, aerospace, and industrial manufacturing environments.

This end mill is suited for full-slot and peripheral milling in tight-tolerance applications involving superalloys and titanium as the primary workpiece material, with secondary capability in stainless steel and carbon steel. The extended reach configuration, with a 4.3071 inch reach length and 3-1/4 inch length of cut, allows access to deep pockets and stepped features where standard-reach tools cannot be used. The straight-cylindrical shank with h6 tolerance ensures consistent runout in standard collet and hydraulic chuck toolholding systems. It is part of the MA377.A-5-R series.

Key Features

• 0.1900 inch corner radius reduces stress concentration and improves tool life at the cutting edge
• nACRo coating (WJ30EN) provides high-temperature hardness and oxidation resistance for superalloy and titanium cutting
• 5-flute geometry supports both roughing and finishing in a single tool, reducing changeover time
• 38-degree helix angle promotes smooth chip flow and reduced cutting forces in long-reach applications
• Extended reach with 4.3071 inch reach length enables deep-pocket and stepped-feature access
• Centercutting design allows plunge entry without a pre-drilled pilot hole

Compatibility

Designed for use with standard 3/4 inch straight-cylindrical collet chucks, hydraulic chucks, and shrink-fit toolholders accepting an h6-tolerance shank. Primary workpiece material is superalloys and titanium (ISO material code S); secondary materials include stainless steel (M) and steel (P).

Installation Notes

This tool should be installed by a qualified machinist following the toolholder manufacturer specifications for clamping torque and runout verification. Always confirm spindle speed, feed rate, and depth of cut against the MA377.A-5-R series cutting data recommendations before operation. Inspect the shank and collet bore for contamination or damage before seating the tool. Extended-reach tools are more sensitive to vibration; verify setup rigidity and minimize overhang beyond the specified reach length.