Hertel E299921159 Square End Mill 11/64 in 4 Flute Cobalt

Product Description

The HERTEL E299921159 is a single-end, square-profile cobalt end mill designed for milling operations on ferrous and hard materials. Built from M42 cobalt high-speed steel, it runs a 0.1719-inch (11/64 inches) cutting diameter with a 0.5-inch length of cut and a 30-degree helix angle across four right-hand spiral flutes. The bright, uncoated finish is suited for applications where coating compatibility or re-sharpening is a priority. Machinists and toolroom operators use this end mill in vertical milling machines and CNC machining centers for slotting, profiling, and peripheral milling on steel, stainless steel, and similar hard-to-cut alloys.

This end mill fits standard 3/8-inch collets and tool holders, making it a straightforward drop-in for most vertical mills and machining centers running that shank size. The 2.375-inch overall length provides adequate reach for typical workpiece setups without introducing excessive overhang. The centercutting geometry allows for plunge entry directly into the workpiece, adding versatility for pocket milling operations. It is appropriate for job shops, tool-and-die operations, maintenance machining, and production environments where cobalt tooling is specified for improved heat and wear resistance over standard HSS.

Key Features

• M42 cobalt high-speed steel construction for improved heat resistance and tool life on hard materials
• 4-flute spiral design with right-hand cut and right-hand flute direction for standard milling operations
• 30-degree helix angle balances cutting efficiency with edge strength
• Centercutting geometry permits direct plunge entry into workpiece material
• Bright/uncoated finish suitable for re-sharpening or use where coatings are not required
• Single-end configuration with 3/8-inch shank for compatibility with standard collet systems

Compatibility

Designed for use in standard 3/8-inch collet chucks and end mill holders on vertical milling machines and CNC machining centers. No specific model compatibility data was provided by the manufacturer for this SKU.

Installation Notes

Installation should be performed by a qualified machinist. Ensure the spindle is fully stopped and the machine is powered down before changing tooling. Seat the shank fully into the collet or holder and tighten to the tool holder manufacturer's specified clamping procedure. Verify runout with a dial indicator before beginning the cut, as excessive runout will accelerate edge wear on a 4-flute tool at this diameter.