Hertel E2039040 Square End Mill 5/8 Inch 4 Flute Cobalt

Product Description

The HERTEL E2039040 is a cobalt square end mill designed for general-purpose milling operations in ferrous and non-ferrous metals. Built from M42 cobalt high-speed steel, it delivers greater heat and wear resistance than standard HSS tooling, making it well suited for harder materials and interrupted cuts. The cutter measures 0.625 inches in diameter with a 1.625-inch length of cut and a 3.75-inch overall length. Four spiral flutes at a 30-degree helix angle evacuate chips efficiently while maintaining a smooth finish along the workpiece. This is a single-end, uncoated tool in a regular length configuration, installed by machinists and CNC operators across job shop and production environments.

This end mill is appropriate for milling slots, pockets, and profiles in steel, stainless, cast iron, and similar materials where cobalt tooling is preferred over carbide due to toughness requirements or machine rigidity limitations. Its centercutting geometry allows direct plunge entry without a pre-drilled hole, adding flexibility in secondary operations. The 0.625-inch shank diameter fits standard collet chucks and end mill holders used on vertical mills, knee mills, and CNC machining centers. Regular-length geometry keeps deflection low in typical depth-of-cut ranges for this diameter class.

Key Features

• M42 cobalt HSS construction for improved heat resistance over standard M2 tooling
• Four spiral flutes with 30-degree helix angle for efficient chip evacuation
• Centercutting design allows direct plunge milling without a pilot hole
• Right-hand cut and right-hand flute orientation for conventional spindle use
• Uncoated finish — compatible with re-sharpening services
• Regular length profile minimizes deflection at standard depths of cut

Compatibility

Designed as a standard square end mill replacement for 0.625-inch diameter applications in collet chucks, end mill holders, and Weldon-style tool holders accepting a 0.625-inch shank.

Installation Notes

Installation and use should be performed by qualified machinists or CNC operators. Secure the shank fully in a clean, properly sized collet or holder and torque to the tool holder specification before engaging the spindle. Inspect the tool for edge chipping or shank wear before each use. Ensure machine spindle runout is within acceptable tolerance for the diameter class to avoid premature edge failure.