Hertel E103901402 Square End Mill 7/32 Inch 4 Flute Hss

Product Description

The HERTEL E103901402 is a 4-flute square end mill designed for general-purpose milling operations in metal and ferrous materials. Manufactured from M7 high speed steel, it runs uncoated with a spiral flute geometry and a 30-degree helix angle that promotes chip evacuation and cutting stability. The mill diameter is 0.2188 inches (7/32 inch), the length of cut is 0.625 inches (5/8 inch), and the overall length is 2.4375 inches (2-7/16 inch). The 0.375-inch (3/8 inch) shank fits standard milling chuck and collet holders. Center-cutting geometry allows plunge entry in addition to peripheral cuts. Installed by machinists and tool-and-die technicians on manual mills and CNC machining centers.

This end mill suits short-to-medium reach milling tasks in job shops, maintenance machining environments, and production settings where HSS tooling is preferred over carbide. The right-hand cut and right-hand spiral flute configuration make it compatible with standard spindle direction on most vertical milling machines. Extended reach is not a feature of this tool, keeping deflection low during slotting and profiling cuts in mild steel, tool steel, aluminum, and similar machinable materials.

Key Features

• M7 high speed steel construction for toughness and re-sharpenability
• 4-flute spiral geometry with 30-degree helix for efficient chip flow
• Center-cutting design allows direct plunge entry without a pre-drilled hole
• Right-hand cut and right-hand flute direction for standard spindle operation
• Uncoated finish suitable for use with cutting fluids on ferrous and non-ferrous materials
• 3/8 inch shank compatible with common collet and chuck toolholding systems

Compatibility

Designed as an OEM-style replacement or direct-use HSS square end mill for standard 3/8 inch collet and milling chuck toolholders on vertical mills and CNC machining centers.

Installation Notes

Installation should be performed by a qualified machinist following shop safety procedures. Ensure the machine spindle is fully stopped and locked out before inserting or removing the tool from its holder. Verify collet or chuck torque specifications per the toolholder manufacturer's guidelines before running. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain surface finish quality.