Hertel 44839421 Roughing End Mill 1/2 in 4 Flute Cobalt M42

Product Description

The HERTEL 44839421 is a single-end cobalt roughing end mill designed for aggressive material removal in milling applications. Built from M42 cobalt high-speed steel, it delivers heat and wear resistance needed for roughing cuts on tough workpiece materials. The 1/2 inch diameter tool features 4 flutes with a coarse pitch geometry that breaks chips efficiently and reduces cutting forces during heavy stock removal. The bright, uncoated finish keeps the tool in its as-ground state, suitable for a wide range of metals. This end mill is installed and operated by machinists and tool-and-die professionals in manual or CNC milling setups.

This roughing end mill fits standard 1/2 inch milling chucks, collets, and end mill holders. The coarse-pitch flute design is well suited for roughing passes on carbon steel, alloy steel, stainless steel, and other ferrous metals where high material removal rate is the priority. With a 5/8 inch length of cut and 2-5/8 inch overall length, it is sized for shallow-to-moderate depth roughing operations in both vertical and horizontal milling machines. Right-hand cutting and right-hand flute direction are standard for conventional and climb milling.

Key Features

• M42 cobalt HSS construction for elevated heat resistance during roughing cuts
• Coarse pitch, 4-flute geometry promotes chip breaking and reduces chatter
• 1/2 inch shank diameter fits standard collets and end mill holders without adapters
• Bright uncoated finish — no coating buildup to affect dimensional accuracy
• Right-hand cut and right-hand helix for conventional milling compatibility
• Single-end design with 5/8 inch length of cut for controlled roughing depth

Compatibility

Designed as a direct-fit roughing end mill for any standard 1/2 inch end mill holder, collet chuck, or Weldon-style holder used in CNC or manual milling machines. No specific OEM equipment compatibility was stated in the product data.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool manufacturer guidelines for tool holding and runout tolerances. Ensure the spindle is fully powered down and locked before inserting or removing the end mill from the holder. This tool is not center-cutting and should not be used for plunge entry — use a pilot hole or ramping entry path instead. Inspect shank and holder bore for chips or damage before securing to maintain runout within acceptable limits.