Hertel 91192773 Roughing End Mill 1-1/4 in 6 Flute Cobalt

Product Description

The HERTEL 91192773 is a single-end roughing end mill designed for aggressive material removal in milling operations. Built from M42 cobalt high-speed steel and coated with Titanium Nitride (TiN), it delivers extended tool life in demanding cutting environments. The coarse-pitch, 6-flute geometry breaks chips efficiently and reduces cutting forces on the workpiece. With a 1.25-inch mill diameter, 6-inch length of cut, and 8.5-inch overall length, this tool handles deep-cavity and heavy-roughing passes that standard end mills cannot sustain. It is a right-hand cut, right-hand flute tool and is not center-cutting.

This roughing end mill is suited for production machining, tool-and-die, and job-shop environments where fast stock removal from steel, stainless, and high-temperature alloys is required. The M42 cobalt substrate resists heat buildup better than standard M2 HSS, making it a practical choice for harder materials and interrupted cuts. Machinists and CNC operators working on vertical mills, horizontal mills, or manual knee mills will find it appropriate for rough-profiling and slotting where finish is secondary to removal rate.

Key Features

• M42 cobalt steel construction for increased red-hardness and wear resistance over standard HSS
• Titanium Nitride (TiN) coating reduces friction and extends tool life in ferrous materials
• 6-flute coarse-pitch geometry for high chip load and rapid material removal
• 1.25-inch mill diameter with matching 1.25-inch straight shank for rigid toolholder fit
• 6-inch length of cut supports deep-cavity roughing passes
• Right-hand cut and right-hand flute — not center-cutting, designed for peripheral and slot roughing

Compatibility

Designed as a direct-fit replacement for standard 1.25-inch shank roughing end mill holders used in production milling applications. Confirm toolholder bore diameter and collet size before installation.

Installation Notes

Installation is performed by qualified machinists following shop safety procedures. Ensure the machine spindle is fully powered down and locked out before mounting or removing the tool. Seat the shank fully into the toolholder and torque the retention hardware according to the toolholder manufacturer's specifications. Verify runout with a dial indicator before beginning a cut, as excessive runout accelerates flute wear on multi-flute tools.