Hertel E4040040 Square End Mill 5/8 in 4 Flute Cobalt

Product Description

The HERTEL E4040040 is a square end mill designed for general-purpose milling in ferrous and difficult-to-machine materials. Built from M42 cobalt high-speed steel with a titanium nitride (TiN) finish, it delivers extended tool life in demanding cutting applications. The four-flute, spiral configuration with a 30-degree helix angle promotes efficient chip evacuation and smooth surface finishes. At 5/8 inch in diameter with a 2-1/2 inch length of cut, it falls into the long-series category, making it well suited for reaching deeper pockets and cavities. Licensed machinists and tool-and-die professionals are the primary users.

This end mill is used in manual and CNC milling operations across job shops, production floors, and tool rooms. The centercutting geometry allows it to plunge directly into workpiece material without a pre-drilled pilot hole. Right-hand cut and right-hand flute configuration matches standard spindle rotation on conventional milling machines and machining centers. The long length of cut exceeds 2 inches, making it appropriate for deep-pocket work where a standard-length end mill cannot reach.

Key Features

• M42 cobalt HSS construction for heat and wear resistance in tough alloys
• TiN coating reduces friction and extends tool life at elevated cutting speeds
• 30-degree helix spiral flute promotes efficient chip evacuation
• Centercutting design enables direct plunge milling without a pilot hole
• Long-series length of cut at 2-1/2 inches for deep-pocket applications
• Right-hand cut and right-hand flute for standard spindle compatibility

Compatibility

Designed as a long-series OEM-style square end mill for use in standard 5/8 inch end mill holders, collet chucks, and Weldon-style tool holders on manual mills and CNC machining centers.

Installation Notes

Installation requires a milling machine with a properly sized collet or end mill holder to accept a 5/8 inch shank diameter. Ensure the spindle is fully powered down and the machine is in a safe, locked state before mounting or removing the tool. Verify runout with a dial indicator after seating the tool to avoid premature edge chipping. Follow shop-specific feeds, speeds, and coolant procedures appropriate for cobalt tooling in the workpiece material being cut.