Hertel E1039020 Square End Mill 5/16 in 4 Flute Hss

Product Description

The HERTEL E1039020 is a 4-flute square end mill designed for general-purpose milling operations in ferrous and non-ferrous metals, alloy steels, and similar materials. Ground from M7 high speed steel and left uncoated, it delivers consistent cutting performance in standard machining environments. The 0.3125 inch mill diameter pairs with a 0.3750 inch shank, making it compatible with common collet and end mill holders found in vertical mills and machining centers. A 30-degree helix angle promotes smooth chip evacuation and reduces cutting forces during peripheral and slot milling. Licensed machinists and tool-and-die professionals are the primary installers of this type of cutting tool.

This end mill is suited for manual knee mills, CNC vertical machining centers, and benchtop milling machines operating in job shops, maintenance facilities, and production environments. The regular-length geometry and 0.75 inch length of cut make it a practical choice for slotting, profiling, and light pocketing operations at depths up to 0.75 inches. Its centercutting design allows direct plunge entry into a workpiece without a pre-drilled pilot hole, adding flexibility to the machining process.

Key Features

• Centercutting geometry allows direct plunge milling without a pilot hole
• 30-degree helix angle promotes efficient chip flow and reduced cutting pressure
• M7 high speed steel construction provides good wear resistance across a range of work materials
• Right-hand cut and right-hand spiral flute configuration suits standard spindle rotation
• Spiral flute design with no chipbreaker for clean, continuous cuts
• Uncoated finish suitable for use with standard cutting fluids and lubricants

Compatibility

Designed as a standard-geometry square end mill for use in any milling machine or machining center equipped with a collet, end mill holder, or side-lock holder accepting a 0.3750 inch shank diameter.

Installation Notes

Installation is performed by a machinist or toolroom technician. The machine spindle must be fully stopped and the machine powered down before inserting or removing any cutting tool. Secure the shank firmly in a properly sized collet or end mill holder torqued to the tool holder manufacturer's specification. Inspect the shank and cutting edges for damage before each use, and confirm runout is within acceptable limits before beginning a cut.