Hertel E2039016 Square End Mill 0.25 in 4 Flute Cobalt

Product Description

The HERTEL E2039016 is a cobalt square end mill designed for milling operations in ferrous and difficult-to-machine materials. Built from M42 cobalt high-speed steel, it delivers heat resistance and edge retention that standard HSS tooling cannot match. The cutter runs a 0.25 inch diameter with a 0.625 inch length of cut, a 0.375 inch shank diameter, and a 2.4375 inch overall length. Four right-hand spiral flutes at a 30-degree helix angle provide efficient chip evacuation and a smooth cutting action. The uncoated finish suits applications where coating buildup or heat transfer would be concerns. Licensed machinists and tool-and-die professionals are the primary users.

This end mill is suited for general milling work including slotting, profiling, and pocket milling in steel, stainless, and other tough alloys. The regular length geometry and 0.625 inch length of cut support a wide range of standard machining setups on vertical mills and CNC machining centers. The centercutting design allows plunge entry directly into the workpiece without a pre-drilled hole, adding versatility to the tool path. The 0.375 inch shank is a common size for collet chucks and standard toolholders in production and job-shop environments.

Key Features

• M42 cobalt construction for heat resistance and edge retention in tough alloys
• Four right-hand spiral flutes at 30-degree helix for efficient chip evacuation
• Centercutting design allows direct plunge entry without pre-drilling
• Uncoated finish maintains dimensional accuracy in heat-sensitive applications
• Regular length geometry fits standard collets and toolholders
• Right-hand cut and right-hand flute configuration for conventional spindle use

Compatibility

Designed as an OEM-style replacement or direct substitute for 0.25 inch cobalt square end mills with a 0.375 inch shank in standard collet chucks and milling toolholders.

Installation Notes

Installation is performed by machinists using a collet chuck or end mill holder sized to the 0.375 inch shank. Ensure the spindle is fully stopped and the machine is powered down before changing tooling. Verify runout with a dial indicator after seating and before cutting. Follow the machine tool manufacturer guidelines for clamping torque on collet nuts.