Hertel E2020040 Ball End Mill 0.625 in 4 Flute Cobalt

Product Description

The HERTEL E2020040 is a single-end cobalt ball end mill designed for milling curved surfaces, contours, and complex profiles in metalworking applications. Built from M42 cobalt high-speed steel, it offers improved heat and wear resistance compared to standard HSS tooling. The 0.625 inch cutting diameter pairs with a 1.625 inch length of cut, giving machinists sufficient reach for most regular-length milling operations. The 30-degree right-hand spiral flute geometry promotes chip evacuation and helps reduce cutting forces. At 0.27 pounds, the tool is balanced for use in standard vertical and horizontal milling setups.

This ball end mill is suited for job shops, tool rooms, and production machining environments running ferrous metals, stainless steels, and high-temp alloys where cobalt tooling is the preferred choice over carbide in interrupted cuts or flex-prone setups. The uncoated finish makes it straightforward to resharpen on a standard tool grinder, extending tool life beyond the initial grind. It is sold as a single-end tool, meaning the shank end is not a usable cutting end.

Key Features

• M42 cobalt construction for improved red hardness and wear resistance over standard M2 HSS
• Ball nose profile for contour milling, radius blending, and 3D surface work
• 4-flute, 30-degree right-hand spiral for efficient chip removal and smooth finish
• Uncoated — easy to resharpen with standard CBN or aluminum oxide grinding wheels
• Matched shank and cutting diameter at 0.625 inches for direct collet or end mill holder mounting
• Regular-length geometry suitable for most standard VMC and manual mill applications

Compatibility

Designed as a standard-shank cobalt ball end mill with a 0.625 inch shank diameter, compatible with ER collets, Weldon-style end mill holders, and shrink-fit holders sized for 0.625 inch shanks on vertical and horizontal milling machines.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Ensure the spindle is fully stopped and machine power is locked out before changing tooling. Secure the shank with proper torque on the end mill holder set screw or collet nut — refer to the holder manufacturer's specifications. Inspect the cutting edges and shank for damage before mounting; do not use a tool with chipped flutes or a damaged shank.