Hertel E7020020 Ball End Mill 0.3125 in 4 Flute Cobalt

Product Description

The HERTEL E7020020 is a single-end ball end mill designed for contour milling, profiling, and 3D surface work in ferrous and non-ferrous metals. Built from M42 cobalt high-speed steel, it delivers greater heat and wear resistance than standard HSS tools, making it well suited for harder workpiece materials and interrupted cuts. The 0.3125 inch diameter cutting end features 4 flutes with a 30-degree right-hand spiral helix, providing a balance of chip evacuation and surface finish quality. A TiCN coating further extends tool life by reducing friction and resisting edge buildup during cutting operations.

This end mill is intended for use in CNC machining centers, knee mills, and manual vertical mills across job shops, tool rooms, and production environments. The 3/8 inch shank diameter fits standard ER collets and end mill holders common in light-to-medium duty setups. With a 0.75 inch length of cut and 2.5 inch overall length, this is a regular-length geometry suited to general-purpose profiling and cavity work where extended reach is not required. Machinists and toolroom technicians are the primary users.

Key Features

• M42 cobalt HSS construction for improved heat resistance over standard HSS
• TiCN coating reduces friction and extends tool life in abrasive and harder materials
• 4-flute, 30-degree right-hand helix for balanced chip flow and finish quality
• Ball end geometry supports contour milling, slotting, and 3D surface profiling
• Single-end design with 0.3125 inch diameter and 0.75 inch length of cut
• Regular length at 2.5 inches OAL for rigid setups without extended reach

Compatibility

Designed for use in standard end mill holders and ER collet chucks accepting a 3/8 inch shank diameter; suitable for CNC and manual milling machines configured for right-hand cutting tools.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Secure the shank fully into the collet or end mill holder to the recommended gauge line depth before tightening. Confirm spindle direction is set to right-hand rotation before engaging the cut. Inspect the cutting edges and coating for chips or wear before each use and replace the tool when edge condition degrades to avoid workpiece damage.