Hertel 91191932 Roughing End Mill 1 in 5 Flute Cobalt M42

Product Description

The HERTEL 91191932 is a single-end roughing end mill designed for aggressive material removal in milling applications. Built from M42 cobalt high-speed steel with a bright, uncoated finish, it delivers the heat resistance and edge retention needed for ferrous and hard materials. The tool features a 1 inch cutting diameter, 5 flutes, and a 6 inch length of cut, with an overall length of 8.5 inches and a 1 inch shank diameter. The right-hand cut and right-hand flute direction are standard for conventional vertical and horizontal milling setups. This is a non-centercutting tool, so it is not intended for direct plunge operations.

This roughing end mill is suited for heavy roughing passes on ferrous metals, alloy steels, and similar materials where chip clearance and tool life under load are priorities. The 5-flute geometry and M42 cobalt construction handle interrupted cuts and abrasive workpieces better than standard HSS tooling. Typical applications include production milling on manual and CNC knee mills, vertical machining centers, and horizontal mills in job shop or manufacturing environments. It is installed by machinists and tool-and-die professionals working in metalworking and fabrication shops.

Key Features

• M42 cobalt high-speed steel construction for improved heat and wear resistance over standard HSS
• 5-flute design promotes faster material removal rates on roughing passes
• 1 inch cutting diameter with a 6 inch length of cut for deep-reach roughing operations
• Bright, uncoated finish suitable for use with cutting fluids on ferrous materials
• Right-hand cut and right-hand helix for compatibility with standard milling spindle rotation
• Non-centercutting geometry — requires a pre-drilled or pre-bored entry point

Compatibility

Designed as an OEM-style roughing end mill for use in standard 1 inch collet or end mill holders on manual and CNC milling machines.

Installation Notes

Installation is performed by qualified machinists. Always power down and lock out the machine spindle before changing tooling. Secure the shank fully within the holder to the manufacturer-recommended engagement depth and confirm runout with a dial indicator before cutting. Because this tool is non-centercutting, do not attempt direct plunge entry into solid material.