Hertel 84213768 Roughing End Mill 7/8 in 5 Flute Cobalt

Product Description

The HERTEL 84213768 is a single-end roughing end mill designed for aggressive material removal in milling operations. Built from M42 cobalt high-speed steel and finished with a TiCN coating, this tool handles tough ferrous and non-ferrous materials with extended tool life compared to standard HSS. It features 5 flutes in a right-hand cutting and right-hand flute direction, a 7/8 inch (0.8750 inch) mill diameter, and a 1-7/8 inch length of cut. Machinists and toolroom professionals use it where roughing passes demand chip-breaking geometry and thermal resistance.

This roughing end mill suits vertical and horizontal milling machines, CNC machining centers, and manual knee mills in job shop, production, and MRO environments. The single-end configuration is standard for general-purpose roughing on steel, alloy steels, and similar materials. The 7/8 inch shank diameter matches the mill diameter for direct collet or end mill holder mounting. It is not center-cutting, so it is not suited for direct plunge entry.

Key Features

• M42 cobalt steel construction for improved heat and wear resistance over M2 HSS
• TiCN coating extends tool life in abrasive and high-temperature cutting conditions
• 5-flute roughing geometry promotes chip breaking and reduces chatter on heavy cuts
• Right-hand cut, right-hand helix for standard milling spindle compatibility
• Single-end design with 1.8750 inch length of cut and 4.1250 inch overall length
• Not center-cutting — requires a pre-drilled or pre-milled entry point for pocket work

Compatibility

Designed as a direct-mount roughing end mill for standard 7/8 inch end mill holders, collet chucks, and milling machine spindles accepting a 7/8 inch straight shank.

Installation Notes

Installation is performed by machinists using an appropriate end mill holder or collet chuck rated for the 7/8 inch shank diameter. Ensure the spindle and machine are fully powered down and locked out before mounting or changing tooling. Follow the machine manufacturer torque guidelines for set screws or collet nuts. Confirm tool runout with a dial indicator after mounting before initiating a cut.