Hertel 84511591 Roughing End Mill 3/8 in 4 Flute Cobalt

Product Description

The HERTEL 84511591 is a single-end roughing end mill designed for aggressive material removal in milling applications. Built from M42 cobalt high-speed steel and finished with a Titanium Nitride (TiN) coating, it delivers extended tool life and improved heat resistance compared to standard HSS tooling. The coarse-pitch, 4-flute geometry breaks chips efficiently while reducing cutting forces. The mill diameter and shank diameter are both 0.375 inches, with a 0.375-inch length of cut and an overall length of 2.156 inches. It is a right-hand cut, right-hand flute tool and is center-cutting, allowing plunge entry. Machinists and tool-and-die professionals use this end mill for roughing passes on steel, stainless, and tough alloys.

This end mill is suited for roughing operations on machining centers, knee mills, and manual vertical mills where stock removal rate is the priority over surface finish. The coarse tooth profile roughs out material quickly before a finish end mill is applied. The TiN coating helps maintain edge integrity in ferrous materials. At 0.375-inch diameter with a 0.375-inch length of cut, it fits standard 3/8-inch collets and end mill holders without modification.

Key Features

• M42 cobalt material grade for improved hot hardness over standard M2 HSS
• Titanium Nitride (TiN) coating extends tool life and reduces heat buildup
• Coarse-pitch roughing geometry for high stock removal rates
• Center-cutting design allows axial plunge entry into the workpiece
• Right-hand cut and right-hand flute for standard spindle rotation
• Single-end construction with 3/8-inch shank for direct collet or end mill holder mounting

Compatibility

Designed for use in standard 3/8-inch end mill holders, collet chucks, and milling machine spindles accepting a 3/8-inch straight shank. Suitable for roughing ferrous and tough alloy materials on CNC machining centers and manual knee mills.

Installation Notes

Installation should be performed by a qualified machinist following shop safety procedures. Ensure the spindle is fully stopped and the machine is powered down or placed in an e-stop state before loading or changing tooling. Seat the shank fully into the holder to the recommended grip length and torque set screws or collet nuts according to the toolholder manufacturer specifications. Verify runout with a dial indicator before beginning the cut.