Hertel E299914074 Ball End Mill 0.25in 4 Flute Cobalt

Product Description

The HERTEL E299914074 is a single-end cobalt ball end mill designed for precision milling of contoured surfaces, slots, and complex 3D profiles on CNC machining centers and manual mills. The tool features a 0.25 inch mill diameter with a 1 inch length of cut, a 30-degree helix angle, and a 4-flute spiral configuration. Manufactured from M42 cobalt high-speed steel, it delivers improved heat and wear resistance compared to standard M2 HSS tooling, making it well suited for harder steels, stainless alloys, and tough materials where carbide may not be required. The bright uncoated finish maintains a sharp edge geometry straight from the factory.

This end mill is used in both production and job-shop environments for profiling, contouring, and finish milling passes on ferrous and non-ferrous workpieces. The 3/8 inch shank diameter fits standard ER collet chucks, milling chucks, and end mill holders commonly found in vertical machining centers and knee mills. Its single-end design is standard for general-purpose milling applications in toolrooms, maintenance shops, and light production settings. Machinists and CNC operators handling die work, mold cavities, or general contouring will find this geometry appropriate for those tasks.

Key Features

• M42 cobalt HSS construction for improved heat resistance over standard HSS
• 4-flute spiral configuration for improved surface finish on profiling cuts
• 30-degree helix angle balances cutting efficiency and chip evacuation
• Bright uncoated finish — no coating buildup to affect dimensional accuracy
• Right-hand cut and right-hand flute direction, standard for conventional milling setups
• Single-end design with 0.25 inch ball nose for contouring and 3D surface work

Compatibility

Designed as a standard-fitment single-end ball end mill for use in ER collet systems and end mill holders accepting a 3/8 inch shank diameter.

Installation Notes

Installation is performed by a machinist or CNC operator. Ensure the machine spindle is fully stopped and locked out before mounting or removing tooling. Seat the shank fully into the collet or holder and torque the nut or set screw to the tool holder manufacturer's specification. Verify runout with a dial indicator before beginning cuts, as excessive runout will accelerate edge wear and degrade surface finish.