Hertel 44839090 Roughing End Mill 3/4 in 4 Flute Cobalt

Product Description

The HERTEL 44839090 is a single-end roughing end mill designed for aggressive material removal in milling operations. Built from M42 cobalt high-speed steel and finished with a Titanium Nitride (TiN) coating, it handles tough ferrous metals and difficult-to-machine alloys where standard HSS tooling falls short. The cutter measures 3/4 inch in diameter with a 2.5-inch length of cut and a 4.75-inch overall length. Four right-hand flutes with a coarse pitch geometry break chips rapidly and reduce heat buildup during heavy roughing passes. The 3/4-inch straight shank fits standard end mill holders and collet chucks. This tool is installed and changed out by machinists and tool-and-die professionals in job shop and production environments.

This roughing end mill is suited for peripheral milling, slotting, and profiling operations where stock removal rate matters more than surface finish. It performs in vertical and horizontal machining centers as well as manual knee mills. The coarse pitch flute design evacuates chips efficiently, making it a practical choice for roughing passes on steel, stainless, cast iron, and similar materials before a finish end mill is applied. The TiN coating extends tool life by reducing friction and improving wear resistance at the cutting edge.

Key Features

• M42 cobalt HSS construction for elevated heat and wear resistance versus standard M2 HSS
• Titanium Nitride (TiN) coating reduces friction and extends cutting edge life
• Coarse pitch, 4-flute geometry promotes aggressive chip evacuation during roughing
• Right-hand cut and right-hand flute direction for use in conventional milling setups
• 3/4 inch shank diameter matches mill diameter for direct collet or end mill holder mounting
• Non-centercutting design — requires a drilled or bored entry point before plunge operations

Compatibility

Designed as an OEM-style replacement or standard tooling option for milling machines accepting a 3/4-inch straight shank end mill. Confirm spindle taper, collet size, and holder bore before installation.

Installation Notes

Installation is performed by machinists or toolroom technicians. Power down and lock out the machine spindle before changing tooling. Seat the shank fully into the collet or end mill holder and torque the retention screw or drawbar per the machine tool manufacturer specifications. Because this is a non-centercutting end mill, do not attempt direct plunge cuts — pre-drill or bore a starting pocket before ramping or plunging.