Hertel E4039024 Square End Mill 3/8 Inch 4 Flute Cobalt

Product Description

The HERTEL E4039024 is a 4-flute cobalt square end mill designed for general-purpose milling operations in ferrous and non-ferrous materials. Built from M42 cobalt high-speed steel, it handles elevated cutting temperatures better than standard HSS tooling. The 30-degree helix angle promotes smooth chip evacuation and reduces chatter across a range of cutting conditions. A TiN (titanium nitride) finish increases surface hardness and extends tool life compared to uncoated equivalents. At 0.375 inches in diameter with a 0.75-inch length of cut and 2.5-inch overall length, this is a compact, regular-length end mill suited for slotting, profiling, and peripheral milling on manual and CNC machines.

This end mill is intended for machining centers, knee mills, and CNC machining applications where a reliable, cost-effective cobalt tool is appropriate. The centercutting geometry allows both plunge and ramp entry, expanding its usefulness in general job-shop and production environments. Right-hand cut and right-hand spiral flute configuration match standard spindle rotation on conventional milling equipment. It is typically installed and operated by machinists and tool-and-die professionals following standard shop practices for tooling setup and speeds and feeds selection.

Key Features

• M42 cobalt construction for improved heat and wear resistance over standard HSS
• TiN coating adds surface hardness and reduces friction at the cutting edge
• 30-degree helix angle promotes efficient chip flow and reduced vibration
• Centercutting design allows plunge milling and ramp entry
• 4-flute geometry suited for finishing passes and harder workpiece materials
• Right-hand cut with right-hand spiral flute for standard spindle compatibility

Compatibility

Designed as a standard single-end square end mill for use in collet chucks, end mill holders, and similar 3/8-inch shank toolholding systems on conventional and CNC milling machines.

Installation Notes

Installation should be performed by a qualified machinist following shop safety procedures. Power down and lock out the machine spindle before seating or removing tooling. Ensure the shank is fully engaged in the toolholder to the recommended grip depth and that the collet or set screw is properly torqued per the toolholder manufacturer's specifications. Verify spindle rotation direction matches the right-hand cut configuration before engaging the workpiece.