Hertel 44839199 Roughing End Mill 3/4 in 4 Flute Cobalt M42

Product Description

The HERTEL 44839199 is a single-end roughing end mill designed for aggressive material removal in milling applications. Built from M42 cobalt high-speed steel with a bright, uncoated finish, this tool handles tough ferrous and non-ferrous materials where heat resistance and edge retention are critical. The coarse-pitch, 4-flute geometry with right-hand cutting and right-hand flute direction drives efficient chip evacuation during heavy slotting and peripheral milling. The 3/4 inch mill diameter pairs with a matching 3/4 inch shank diameter and a 2.5 inch length of cut, giving machinists a rigid, full-reach setup for roughing passes on manual or CNC milling machines.

This roughing end mill is suited for job shop, tool room, and production environments where rapid stock removal is the priority before a finishing pass. The center-cutting capability allows plunge entry, expanding its usefulness in pocket milling and ramp entry operations. The M42 cobalt grade offers improved red hardness over standard M2 HSS, making it a reliable choice for cutting alloy steels, stainless steel, cast iron, and similar demanding workpiece materials. Licensed machinists and toolroom operators are the primary installers of this tooling.

Key Features

• M42 cobalt high-speed steel construction for enhanced heat and wear resistance
• Coarse-pitch flute geometry promotes aggressive chip breaking and fast stock removal
• Center-cutting design supports direct plunge entry without a pre-drilled hole
• Right-hand cut and right-hand flute direction for standard milling machine spindle use
• Bright, uncoated finish ready for use as-ground without additional coating layers
• Single-end configuration with 4 flutes and a 4.625 inch overall length

Compatibility

Designed as a standard single-end roughing end mill with a 3/4 inch straight shank, compatible with milling machine collets, end mill holders, and set-screw adapters sized for 3/4 inch shank tooling.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the machine spindle fully stopped and locked out per applicable machine tool safety procedures. Ensure the collet or tool holder is clean and free of chips before seating the shank. Verify shank runout with a dial indicator after clamping to confirm proper seating. Do not exceed the tool manufacturer or machine manufacturer recommended feed and speed parameters for the workpiece material.