Hertel 44839256 Roughing End Mill 9/16 in 4 Flute Cobalt

Product Description

The HERTEL 44839256 is a single-end cobalt roughing end mill designed for aggressive material removal in milling operations. Built from M42 cobalt high-speed steel, this tool handles tough ferrous and non-ferrous materials with a coarse-pitch flute geometry that clears chips efficiently and reduces chatter. The 9/16-inch (0.5625 inch) mill diameter pairs with a 1/2-inch shank, making it compatible with standard end mill holders and collet chucks. The bright, uncoated finish is well suited for general-purpose roughing passes where coating is not required. It is right-hand cutting with right-hand flute direction and is centercutting, allowing plunge entry.

This end mill is used in manual and CNC milling machines for roughing slots, pockets, and profiles in steel, stainless, cast iron, and similar materials. The coarse pitch removes stock quickly in roughing applications before a finish pass is made with a standard end mill. The 1-3/8-inch length of cut and 3-3/8-inch overall length suit typical workpiece depths in tool rooms, job shops, and maintenance machining environments. Machinists and toolmakers performing production or repair work are the primary users of this tool.

Key Features

• M42 cobalt construction for heat and wear resistance in tough materials
• Coarse-pitch roughing geometry for high material removal rates and reduced vibration
• Centercutting design allows direct plunge entry into the workpiece
• Right-hand cut and right-hand helix for standard milling setups
• Bright uncoated finish suitable for general-purpose roughing applications
• 1/2-inch shank diameter fits standard end mill holders and collet chucks

Compatibility

Designed as an OEM-style replacement or direct-fit roughing end mill for standard end mill holders and collet chucks accepting a 1/2-inch shank diameter.

Installation Notes

Installation is performed by machinists or toolmakers using a standard end mill holder, collet chuck, or Weldon-style holder rated for the 1/2-inch shank. Ensure the holder and spindle are clean and free of debris before seating the tool. Verify runout with a dial indicator before beginning the cut, and confirm spindle speed and feed rate are appropriate for the workpiece material and depth of cut. Never exceed the tool manufacturer recommended operating parameters for the material grade and tool geometry.