Hertel E2039020 Square End Mill 5/16 Inch 4 Flute Cobalt

Product Description

The HERTEL E2039020 is a 4-flute cobalt square end mill designed for metal removal and peripheral milling operations in ferrous and non-ferrous materials. Built from M42 cobalt high-speed steel, it delivers improved heat and wear resistance compared to standard HSS tooling. The 5/16-inch cutting diameter and 3/4-inch length of cut make it well suited for slotting, profiling, and light pocketing work. The 30-degree right-hand spiral flute geometry promotes efficient chip evacuation and smooth cutting action. This uncoated, centercutting tool is used by machinists and tool-and-die professionals on manual mills, knee mills, and CNC machining centers.

This end mill fits common shop applications including mold work, fixture fabrication, and general maintenance machining on steel, stainless, and alloy materials. The 3/8-inch shank diameter suits standard collet chucks and end mill holders found on Bridgeport-style and small CNC vertical machining centers. The regular length configuration keeps deflection low during side milling passes. Centercutting capability allows direct plunge entry without a pre-drilled hole, adding flexibility in pocketing operations.

Key Features

• M42 cobalt construction provides superior hot hardness for cutting harder alloys and stainless steel
• 4-flute design balances material removal rate with chip clearance in full-slot and side-milling applications
• 30-degree right-hand helix promotes positive chip flow and reduces cutting forces
• Centercutting geometry allows direct plunge entry into workpiece material
• Uncoated finish suitable for use with standard cutting fluids and lubricants on a wide range of metals
• Regular length with 3/8-inch shank minimizes overhang and deflection in standard end mill holders

Compatibility

Designed as an OEM-style replacement or standard tooling selection for 3/8-inch end mill holders, collet chucks, and side-lock holders used on vertical milling machines and CNC machining centers requiring a 5/16-inch cutting diameter.

Installation Notes

Installation should be performed by a qualified machinist with the spindle fully powered down and locked out. Secure the shank in a clean, properly sized collet or end mill holder to the appropriate engagement depth recommended by the holder manufacturer. Inspect the cutting edges for chips or damage before each use. Follow applicable shop safety procedures and machine tool manufacturer guidelines when setting speeds and feeds for cobalt tooling.