Hertel 91197533 Roughing End Mill 8 Mm 4 Flute Cobalt

Product Description

The HERTEL 91197533 is a single-end cobalt roughing end mill designed for aggressive material removal in milling operations. Built from M42 cobalt high-speed steel, it delivers heat and wear resistance suited to difficult-to-machine materials. The 8 mm cutting diameter and fine-pitch, 4-flute geometry produce a chip-breaking action that reduces cutting forces and vibration during heavy roughing passes. The bright, uncoated finish makes it well suited for applications where coating adhesion to the workpiece is a concern. Center-cutting capability allows plunge entry without a pre-drilled pilot hole, expanding its use across a range of setups.

This end mill is used in vertical machining centers, knee mills, and manual milling machines where roughing cuts are needed before a finish pass. The right-hand cutting and right-hand flute direction make it compatible with standard spindle rotation. With a 19 mm length of cut and 69 mm overall length, it fits toolholders requiring a 10 mm shank diameter. Machinists and tool-and-die professionals use this style of end mill on steel, stainless, and other ferrous alloys where cobalt tooling provides an edge-life advantage over standard HSS.

Key Features

• M42 cobalt construction for improved heat resistance and edge retention over standard HSS
• Fine-pitch, 4-flute roughing geometry reduces cutting forces and dampens chatter
• Center-cutting design allows direct plunge entry without a pre-drilled hole
• Bright, uncoated finish suitable for a wide range of ferrous materials
• Right-hand cut and right-hand flute direction for use in standard spindle rotation
• 10 mm shank diameter compatible with common collet and end mill holder systems

Compatibility

Designed as an OEM-style single-end roughing end mill for use in toolholders accepting a 10 mm shank diameter on standard vertical or horizontal milling machines.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool manufacturer guidelines. Ensure the spindle is fully stopped and the machine is powered down before changing tooling. Use a properly sized collet or end mill holder rated for the 10 mm shank diameter and torque the retention mechanism per the toolholder specification. Inspect the cutting edges for chips or wear before each use and replace if edge integrity is compromised.