Hertel 06821748 Roughing End Mill 1-1/4 in Cobalt M42

Product Description

The HERTEL 06821748 is a single-end cobalt roughing end mill designed for aggressive material removal in ferrous and high-strength alloy applications. Built from M42 cobalt high-speed steel, it delivers heat and wear resistance that standard HSS tools cannot match in demanding cuts. The 1-1/4 inch diameter, 6-flute design generates a coarse chip-breaking geometry that reduces cutting forces and allows higher feed rates compared to standard finish end mills. With a 2-inch length of cut and 4.5-inch overall length, this tool suits deep-slot and stepped-profile operations in vertical mills and machining centers. It is installed and used by machinists in job shops, tool rooms, and production environments.

This roughing end mill is suited for milling slots, profiling, and roughing passes in ferrous metals, alloy steels, and similar materials where high feed rates and chip clearance are priorities. The right-hand cut and right-hand flute direction are standard for conventional vertical milling setups. The tool is not center-cutting, so it requires a pre-drilled entry point or ramping to enter a workpiece. Bright uncoated finish is typical for cobalt tools used in applications where re-sharpening is part of the workflow.

Key Features

• M42 cobalt high-speed steel for elevated heat resistance and extended tool life in hard materials
• 6-flute roughing geometry for aggressive chip-breaking and reduced radial cutting forces
• 1-1/4 inch diameter with matching 1-1/4 inch shank for direct collet or end mill holder mounting
• 2-inch length of cut supports deep slotting and full-depth roughing passes
• Right-hand cut and right-hand flute direction for standard milling setups
• Bright uncoated finish compatible with re-sharpening services

Compatibility

Designed as a direct-fit roughing end mill for standard 1-1/4 inch end mill holders, collet chucks, and milling machine spindles accepting a 1-1/4 inch straight shank.

Installation Notes

Installation is performed by machinists using a calibrated end mill holder or collet chuck rated for the 1-1/4 inch shank diameter. Ensure the machine spindle is fully stopped and locked before mounting or removing the tool. This end mill is not center-cutting and requires a pre-drilled entry hole or ramp entry when plunging into solid material. Verify tool runout with a dial indicator after mounting to minimize premature wear and maintain dimensional accuracy.