Hertel E4041048 Square End Mill 3/4 in 4 Flute Cobalt

Product Description

The HERTEL E4041048 is a cobalt square end mill designed for milling steel, stainless steel, and high-temperature alloys in demanding machining environments. Built from M42 cobalt high-speed steel, it delivers better heat and wear resistance than standard M2 HSS tooling. The 0.75 inch cutting diameter pairs with a 4 inch length of cut, making it well suited for deep slot milling, profiling, and step milling operations where standard-length end mills fall short. A TiN (titanium nitride) coating reduces friction and extends tool life in ferrous materials. Machinists and tool-and-die professionals select this geometry for applications that require reach without sacrificing rigidity.

This end mill fits manual knee mills, CNC machining centers, and CNC bed mills running ferrous and exotic alloy stock. The extra-long length of cut category makes it appropriate for deep-cavity work, mold and die applications, and multi-step part profiles where a standard or long-series end mill cannot reach the required depth. Its centercutting geometry allows direct plunge entry into the workpiece without a pre-drilled hole, giving machinists flexibility in programming approach moves.

Key Features

• M42 cobalt HSS construction for elevated heat resistance in tough alloy steels
• TiN finish reduces friction and extends tool life on ferrous materials
• Centercutting design allows direct plunge milling without a starter hole
• 30-degree helix angle promotes smooth chip evacuation in deep slots
• Right-hand cut, right-hand spiral flute — standard CNC and manual mill compatible
• Extra-long length of cut for deep-cavity, mold, and die work

Compatibility

Designed as a direct-fit replacement-style end mill for any milling machine or machining center accepting a 0.75 inch straight shank tool holder, collet, or end mill adapter.

Installation Notes

Installation should be performed by a qualified machinist following standard toolroom practices. Ensure the spindle is fully stopped and locked before loading or removing the tool from the holder. Use a calibrated torque wrench on set-screw holders and verify tool runout with a dial indicator after seating. Consult your machine tool manufacturer guidelines and applicable shop safety standards before operation.