Hertel E4053020 Square End Mill 5/16 in 4 Flute Cobalt

Product Description

The HERTEL E4053020 is a cobalt square end mill designed for precision milling operations in metalworking applications. Built from M42 cobalt high-speed steel, it delivers superior heat and wear resistance compared to standard HSS tooling, making it well suited for harder materials and interrupted cuts. The double-end design provides two usable cutting ends, extending tool life and reducing cost per cut. Key geometry includes a 30-degree helix angle with spiral flutes for efficient chip evacuation, a TiN (titanium nitride) coating for added surface hardness, and a centercutting configuration that allows plunge milling. The cutting diameter measures 0.3125 inches (5/16 inch) with a 0.75-inch length of cut.

This end mill is used in manual and CNC milling machines for slotting, profiling, and plunge cuts in ferrous and non-ferrous metals. The right-hand cut and right-hand spiral flute configuration is standard for conventional milling setups. The 3/8-inch shank diameter fits standard collet chucks and end mill holders commonly found in knee mills, vertical machining centers, and benchtop mills. Its regular-length geometry makes it appropriate for general-purpose work where extended reach is not required. Machinists, toolmakers, and production operators in job shops, maintenance departments, and manufacturing facilities are the primary users.

Key Features

• M42 cobalt construction provides enhanced hardness and heat resistance over standard M2 HSS
• TiN coating increases surface hardness and reduces friction at the cutting edge
• Double-end design yields two cutting ends per tool for extended service life
• 30-degree helix angle promotes smooth cutting action and efficient chip flow
• Centercutting geometry enables direct plunge entry into workpiece material
• Right-hand cut and right-hand flute direction suits standard milling machine setups

Compatibility

Designed as a standard-shank square end mill with a 3/8-inch shank diameter, compatible with collets, end mill holders, and milling chucks sized for 3/8-inch tooling on manual knee mills and CNC vertical machining centers.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the machine powered down and the spindle fully stopped. Ensure the collet or tool holder is clean and free of chips before seating the shank. Torque retention hardware to the tool holder manufacturers specification using appropriate spanners. Follow applicable machine shop safety practices and wear appropriate PPE during tool changes and machining operations.