Hertel E4030040 Square End Mill 5/8 in 2 Flute Cobalt Tin

Product Description

The HERTEL E4030040 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 and wear resistance beyond standard M2 HSS tooling. The 5/8 inch cutting diameter and 1-5/16 inch length of cut suit slotting, profiling, and peripheral milling applications. A titanium nitride (TiN) coating reduces friction and extends tool life at the cutting edge. The two-flute geometry provides large chip clearance, making it well suited for softer metals and applications where chip evacuation matters. Licensed machinists, tool-and-die workers, and maintenance machinists typically select this type of tooling for manual and CNC milling machines.

This end mill is appropriate for use in vertical and horizontal milling machines, CNC machining centers, and Bridgeport-style knee mills. Its centercutting capability allows plunge milling in addition to standard peripheral and slot milling cuts. The 5/8 inch shank diameter fits standard R8, NMTB, and ER collet toolholders sized for that shank. At 3-7/16 inches overall length, it provides enough reach for typical workpiece depths without excessive overhang. This tool is commonly used in job shops, maintenance departments, and production environments working with steel, cast iron, and similar materials.

Key Features

• M42 cobalt construction for improved heat resistance over standard HSS
• TiN coating reduces friction and extends cutting edge life
• Centercutting design allows direct plunge entry into workpiece
• 2-flute geometry maximizes chip clearance in slotting and profiling cuts
• Matched shank and cutting diameter at 5/8 inch for direct collet mounting
• Single-end configuration with square profile for shoulder and slot milling

Compatibility

Designed as an OEM-style replacement or direct substitute for standard 5/8 inch cobalt square end mills used in manual and CNC milling applications with R8, ER, or NMTB collet systems accepting a 5/8 inch shank.

Installation Notes

Installation is performed by qualified machinists following standard toolroom procedures. Secure the shank fully in the collet or toolholder to the recommended engagement depth before tightening. Verify runout with a dial indicator before cutting to avoid premature edge wear. Always power down and lock out the spindle before changing end mills.