Hertel 44839157 Roughing End Mill 1/4 in 3 Flute Cobalt Tin

Product Description

The HERTEL 44839157 is a single-end cobalt roughing end mill designed for aggressive material removal in milling operations. Built from M42 cobalt high-speed steel, it delivers heat and wear resistance well suited to ferrous metals and harder workpiece materials. The 1/4 inch cutting diameter is paired with a TiN (Titanium Nitride) coating that extends tool life and reduces friction at the cutting edge. With 3 flutes and a coarse pitch configuration, this roughing end mill evacuates chips efficiently during heavy-feed passes. It is intended for machinists and tool-and-die professionals running manual or CNC milling equipment.

This end mill fits applications where rapid stock removal is the priority before a finishing pass. The coarse pitch geometry reduces cutting forces and chatter compared to standard end mills, making it effective on vertical mills, knee mills, and CNC machining centers. The right-hand cut and right-hand flute direction are standard for conventional and climb milling setups. The 3/8 inch shank accepts common R8, ER, or side-lock toolholders found in most shop environments. It is a single-end tool and is not center-cutting, so plunge entry is not recommended.

Key Features

• M42 cobalt construction for improved heat resistance over standard M2 HSS
• TiN coating reduces friction and extends cutting edge life
• Coarse pitch, 3-flute design promotes aggressive chip evacuation on roughing passes
• Right-hand cut and right-hand helix for standard milling setups
• Non-center-cutting geometry — designed for peripheral and slot entry, not plunge cutting
• 3/8 inch shank diameter fits widely available collet and side-lock toolholders

Compatibility

Designed as a direct-fit roughing end mill for any milling machine or machining center accepting a 3/8 inch shank toolholder.

Installation Notes

Installation should be performed by a qualified machinist following standard toolholder torque and runout procedures. Ensure the machine spindle is fully powered down and locked before seating or removing the tool. Confirm shank engagement depth meets toolholder manufacturer minimums to prevent pullout under heavy cutting loads. Because this tool is not center-cutting, avoid programming direct plunge moves into the workpiece.