Hertel 44839140 Roughing End Mill 3/8 in 4 Flute Cobalt Tin

Product Description

The HERTEL 44839140 is a single-end roughing end mill designed for aggressive material removal in milling applications. Built from M42 cobalt high-speed steel with a TiN (titanium nitride) coating, it offers increased hardness and heat resistance compared to standard HSS tooling. The 3/8 inch diameter, 4-flute, coarse-pitch geometry rapidly evacuates chips while reducing chatter during heavy cuts. With a 1-1/8 inch length of cut and 2-15/16 inch overall length, it fits standard toolholders and is suited for roughing passes on ferrous and non-ferrous materials. Machinists and tool-and-die professionals rely on this geometry for efficient stock removal before finish passes.

This end mill is intended for use in vertical machining centers, knee mills, and manual or CNC milling operations where rapid material removal is the priority. The coarse-pitch flute design breaks chips into smaller segments, reducing cutting forces and heat buildup during deep roughing passes. It is appropriate for slotting, profiling, and peripheral roughing in steel, cast iron, and similar materials. The right-hand cutting and right-hand flute direction make it compatible with conventional spindle configurations found in most shop environments.

Key Features

• M42 cobalt HSS construction for elevated red hardness and wear resistance
• TiN coating extends tool life and reduces friction at the cutting edge
• Coarse-pitch, 4-flute design promotes aggressive chip evacuation during roughing
• Right-hand cut and right-hand helix match standard milling machine spindle rotation
• Single-end configuration with 3/8 inch shank diameter for direct collet or endmill holder mounting
• Non-centercutting geometry — requires a pre-drilled or pre-milled entry point for plunge operations

Compatibility

Designed as an OEM-style replacement or direct-fit roughing end mill for standard 3/8 inch diameter collet chucks, end mill holders, and milling arbors used in CNC and manual milling machines.

Installation Notes

Installation should be performed by a qualified machinist following shop safety protocols. Ensure the machine spindle is fully powered down and locked out before loading or removing tooling. Seat the shank fully in the collet or holder to the specified engagement depth before tightening. Verify runout with a dial indicator after mounting, as excessive runout will accelerate wear on a roughing profile.