Hertel 41120551 Roughing End Mill 3/4 in 4 Flute Cobalt

Product Description

The HERTEL 41120551 is a single-end cobalt roughing end mill designed for aggressive material removal in ferrous and non-ferrous metals. Built from M42 cobalt high-speed steel, it handles elevated cutting temperatures better than standard HSS tooling. The 3/4 inch diameter cutter features four right-hand flutes with a bright, uncoated finish and delivers a 3 inch length of cut with a 5-1/4 inch overall length. The serrated roughing profile reduces cutting forces and chip load per flute, allowing faster feed rates in tough materials. This tool is used by machinists and tool-and-die professionals on manual mills and CNC machining centers.

This end mill is suited for roughing passes in steel, stainless steel, cast iron, and similar materials where high heat generation is expected. The center-cutting geometry allows plunge entry as well as peripheral cuts, making it versatile across slotting, profiling, and ramping operations. The regular-length configuration fits standard tool holders and collet chucks with a 3/4 inch bore. It is a practical choice for shops removing large amounts of material before a finish pass with a standard end mill.

Key Features

• M42 cobalt high-speed steel construction for heat and wear resistance
• 4 right-hand flutes with roughing serrations for reduced cutting force
• Center-cutting design allows plunge milling without a pilot hole
• Bright, uncoated finish suitable for general-purpose roughing applications
• Right-hand cutting and right-hand flute direction for standard spindle rotation
• Single-end configuration with 3/4 inch shank diameter matching cutter diameter

Compatibility

Designed as an OEM-style replacement-grade roughing end mill for use in standard 3/4 inch end mill holders, collet chucks, and milling adapters on vertical or horizontal milling machines.

Installation Notes

Installation is performed by qualified machinists following standard machine shop practices. Ensure the spindle is fully stopped and the machine is locked out before changing tooling. Secure the shank fully into the holder to the recommended engagement depth and verify runout with a dial indicator before beginning a cut. Follow the machine manufacturer and tooling supplier recommendations for speeds and feeds based on workpiece material.