Hertel 44839488 Roughing End Mill 1/4 in 3 Flute Cobalt

Product Description

The HERTEL 44839488 is a single-end roughing end mill designed for aggressive material removal in milling operations. Built from M42 cobalt high-speed steel with a bright, uncoated finish, it measures 0.25 inches in diameter with a 0.875-inch length of cut and a 2.688-inch overall length. The 3-flute, coarse-pitch geometry is engineered to break chips quickly and evacuate material efficiently, reducing heat buildup during heavy cuts. With a 0.375-inch shank diameter and right-hand cutting and flute direction, this tool fits standard milling chucks and collet holders used by machinists and tool-and-die professionals.

This roughing end mill is suited for ferrous and non-ferrous metal removal in manual or CNC milling applications. The coarse pitch design handles interrupted cuts and heavy stock removal passes where a standard end mill would deflect or chatter. Typical applications include roughing pockets, slots, and profile passes in steel and stainless materials where a finishing pass will follow. It is not center-cutting and should not be used for direct plunge entry without a pre-drilled hole or ramp entry toolpath.

Key Features

• M42 cobalt construction for heat and wear resistance in ferrous materials
• 3-flute coarse-pitch design for fast chip evacuation during heavy roughing passes
• Bright, uncoated finish standard for general-purpose milling applications
• Right-hand cutting and right-hand flute direction for conventional milling setups
• Non-center-cutting geometry — use ramp entry or pre-drilled start holes
• 0.375-inch shank diameter fits common collet and end mill holder sizes

Compatibility

Designed as an OEM-style replacement roughing end mill compatible with standard milling machine collets and end mill holders accepting a 0.375-inch shank diameter.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the machine powered down and spindle locked. Ensure the collet or end mill holder is clean and free of chips before seating the shank. Confirm runout with a dial indicator before cutting, as excessive runout accelerates tool wear and reduces surface finish quality. This tool is not center-cutting — program ramp or helical entry toolpaths to avoid plunging directly into solid material.