Hertel 44839165 Roughing End Mill 1/4 in 3 Flute Cobalt

Product Description

The HERTEL 44839165 is a single-end roughing end mill designed for aggressive material removal in milling operations. Built from M42 cobalt high-speed steel with a TiN coating, it handles tough ferrous and exotic alloys with extended tool life compared to standard HSS tooling. The 1/4 inch cutting diameter and coarse pitch geometry combine to break chips quickly and reduce heat buildup during heavy roughing passes. Three right-hand flutes with a right-hand cutting direction provide the chip clearance needed for high-feed roughing. Licensed machinists and tool-and-die professionals reach for this style of end mill when hogging out material before finishing operations.

This roughing end mill is suited for use on vertical mills, CNC machining centers, and manual knee mills running ferrous metals, stainless steel, and high-temperature alloys. The 3/8 inch shank diameter accepts standard ER collet chucks and end mill holders common in both manual and CNC setups. With a 7/8 inch length of cut and a 2-11/16 inch overall length, it fits shallow-to-moderate depth pockets and slots in toolroom, production, and maintenance machining environments.

Key Features

• M42 cobalt construction for elevated heat and wear resistance over standard M2 HSS
• TiN coating reduces friction and extends tool life in ferrous materials
• Coarse pitch roughing geometry breaks chips aggressively and reduces cutting forces
• 3 right-hand flutes with right-hand cutting direction for positive chip evacuation
• 3/8 inch shank diameter fits widely available collet chucks and end mill holders
• Single-end design; not centercutting — requires a pre-drilled hole or ramp entry for plunge starts

Compatibility

Designed as an OEM-style replacement or direct-use roughing end mill for standard 3/8 inch end mill holders and ER collet systems on vertical mills and CNC machining centers.

Installation Notes

Installation is performed by qualified machinists or toolroom personnel. Power down and lock out the spindle before seating or removing the end mill from the holder. Torque the collet nut or set screw to the holder manufacturer's specification using the appropriate spanner wrench or hex key. This tool is not centercutting — do not plunge directly into solid material; use a pre-drilled pilot hole or programmed ramp entry to begin the cut.