Hertel E4041016 Square End Mill 1/4 in 4 Flute Cobalt Tin

Product Description

The HERTEL E4041016 is a 4-flute cobalt square end mill designed for milling ferrous and difficult-to-machine materials in machining center and manual mill applications. Built from M42 cobalt high-speed steel, it delivers heat resistance and edge retention in demanding cutting conditions. The tool features a TiN (titanium nitride) coating that reduces friction and extends tool life. With a 0.25-inch cutting diameter and a 1.75-inch length of cut, this end mill handles slotting, profiling, and side milling operations. The extra-long overall length of 3.5625 inches provides reach in deep-cavity applications where standard-length tooling falls short.

This end mill is suited for job shops, tool rooms, and production environments running steel, stainless, cast iron, and similar alloys. The 30-degree right-hand spiral flute geometry promotes chip evacuation and smooth cutting action. Center-cutting capability allows direct plunge entry without a pre-drilled pilot hole, giving machinists flexibility in tool paths. It is installed by machinists and CNC operators in milling machines, machining centers, and manual knee mills using a collet or end mill holder matched to the 0.375-inch shank diameter.

Key Features

• M42 cobalt HSS construction for heat resistance and extended tool life in tough alloys
• TiN coating reduces friction and improves wear resistance at the cutting edge
• 4 right-hand spiral flutes at 30-degree helix angle for efficient chip evacuation
• Center-cutting design permits direct plunge milling without pre-drilling
• Extra-long length of cut (1.75 inches) reaches deep slots and cavities
• Right-hand cut and right-hand flute configuration for standard spindle rotation

Compatibility

Designed for use in collet chucks, end mill holders, and milling adapters accepting a 0.375-inch shank diameter. Suitable for milling machines and CNC machining centers running right-hand spindle rotation.

Installation Notes

This tooling is installed by machinists using an appropriate end mill holder or precision collet sized to the 0.375-inch shank. Ensure the machine spindle is fully stopped and locked out before changing tooling. Verify runout with a dial indicator after installation to confirm concentricity and prevent premature edge wear. Follow machine tool manufacturer torque specifications when tightening the tool holder drawbar or collet nut.