Hertel 91192450 Roughing End Mill 5/8 in 4 Flute Cobalt

Product Description

The HERTEL 91192450 is a single-end roughing end mill designed for aggressive material removal in milling operations. Built from M42 cobalt high-speed steel, it delivers the heat and wear resistance needed for harder workpiece materials. The coarse pitch flute geometry breaks chips efficiently and reduces cutting forces, making it well suited for heavy roughing passes. At 5/8 inch in diameter with a 3.125-inch length of cut and 5.25-inch overall length, this tool fits standard milling machine and machining center spindles. Four right-hand flutes with a right-hand cutting direction provide solid chip evacuation during full-depth slotting and side milling.

This end mill is used in metalworking shops, tool rooms, and maintenance environments where roughing cuts on steel, stainless, and high-temperature alloys are routine. The bright, uncoated finish makes it a straightforward choice when re-sharpening or evaluating wear is part of the workflow. It is not center-cutting, so plunge entry is not a recommended starting move. Typical applications include roughing pockets, slots, and profiles before a finishing pass with a standard end mill.

Key Features

• M42 cobalt HSS construction for improved hardness and heat resistance over standard M2 HSS
• Coarse pitch roughing geometry reduces cutting forces and improves chip breaking on heavy passes
• 5/8 inch diameter with matching 5/8 inch shank for direct collet or end mill holder fitment
• 3.125-inch length of cut handles deep slots and pockets in a single setup
• Bright, uncoated finish allows straightforward visual inspection and resharpenability
• Right-hand cut and right-hand flute direction — compatible with standard spindle rotation

Compatibility

Designed as an OEM-style replacement or direct-use roughing end mill for milling machines and machining centers accepting a 5/8 inch straight shank through collet chucks or end mill holders.

Installation Notes

Installation is performed by machinists or tool room technicians. Power down and lock out the spindle before seating or removing any end mill. Ensure the shank is clean and fully seated in the holder to the manufacturer-recommended engagement depth before torquing the set screw or collet nut. Because this tool is not center-cutting, use a ramping or helical entry path rather than a direct plunge to begin the cut.