Hertel E2040020 Square End Mill 5/16 in 4 Flute Cobalt

Product Description

The HERTEL E2040020 is a cobalt square end mill designed for high-performance milling operations in ferrous and hard-to-machine materials. It features a 5/16-inch cutting diameter, a 1-3/8-inch length of cut, and a 3/8-inch shank diameter for secure tool holding. Built from M42 cobalt high-speed steel, this end mill handles elevated cutting temperatures better than standard HSS tooling. The 4-flute, 30-degree helix spiral flute design provides a balance of chip evacuation and surface finish. Center-cutting geometry allows direct plunge entry. Right-hand cut and right-hand flute orientation suit standard CNC and manual milling setups.

This end mill is suited for milling slots, pockets, contours, and profile cuts in general machining environments. The long length type and 1-3/8-inch length of cut make it appropriate for deeper pocketing operations where a standard-length end mill cannot reach. It is used in job shops, toolrooms, and production machining on vertical mills, CNC machining centers, and manual Bridgeport-style machines. The uncoated finish makes it a reliable option for applications where regrinding is preferred over disposable coated tooling.

Key Features

• M42 cobalt construction for heat resistance in tough alloys and stainless steels
• 4-flute design for improved surface finish and rigidity in slotting and profiling
• 30-degree helix angle balances cutting force and chip flow in ferrous materials
• Center-cutting geometry allows direct plunge milling without pre-drilling
• Right-hand cut and right-hand flute for standard spindle direction compatibility
• Long length type extends reach for deeper pocket and cavity work

Compatibility

Designed as a general-purpose cobalt square end mill compatible with standard 3/8-inch collets, end mill holders, and tool chucks used on vertical milling machines and CNC machining centers.

Installation Notes

Installation should be performed by a qualified machinist or CNC operator. Power down and lock out the machine spindle before inserting or removing the end mill from the holder. Ensure the shank is fully seated to the correct insertion depth in the collet or holder to prevent pullout under cutting load. Follow applicable shop safety standards and machine tool manufacturer guidelines for tool runout and holding torque.