Hertel 44839173 Roughing End Mill 1/4 in 3 Flute Cobalt

Product Description

The HERTEL 44839173 is a single-end roughing end mill designed for aggressive material removal in milling operations. Built from M42 cobalt high-speed steel with a Titanium Nitride (TiN) coating, it delivers elevated heat and wear resistance compared to standard HSS tooling. The coarse-pitch, 3-flute geometry promotes efficient chip evacuation during heavy cuts. With a 0.25-inch mill diameter and a 0.3125-inch length of cut, this end mill is suited for slotting, profiling, and roughing passes where fast stock removal is the priority. It measures 2.125 inches in overall length and weighs approximately 0.011 pounds. Installation and use require a compatible 0.375-inch shank holder.

This end mill is intended for use in CNC machining centers, knee mills, and manual milling machines where roughing operations are performed on ferrous and non-ferrous metals. Its right-hand cutting and right-hand flute direction make it compatible with standard spindle configurations. The coarse pitch helps reduce chatter and loading during interrupted cuts or when milling harder alloys. It is a single-end tool, meaning it is not reversible, and is sized for light-duty to medium-duty milling setups common in job shops and maintenance machining environments.

Key Features

• M42 cobalt steel construction for improved heat resistance over standard M2 HSS
• Titanium Nitride (TiN) coating reduces friction and extends tool life
• 3-flute coarse-pitch geometry promotes chip clearing during roughing cuts
• Right-hand cut and right-hand helix for use with standard milling spindles
• 0.375-inch shank diameter fits common collet and end mill holder systems
• Non-center-cutting design — requires a pre-drilled or pre-bored entry point

Compatibility

Designed as a direct-fit roughing end mill for any milling machine or machining center equipped with a 0.375-inch end mill holder, collet chuck, or Weldon-style holder accepting a 0.25-inch diameter single-end tool.

Installation Notes

This end mill is installed by machinists into a compatible 0.375-inch shank holder; ensure the machine spindle is fully stopped and locked out before changing tooling. Confirm runout with a dial indicator after seating the tool to avoid premature wear or dimensional error. Because this is a non-center-cutting end mill, do not plunge directly into solid material — use a ramping or helical entry path, or begin from an existing bore or slot edge.