Hertel 91192914 Roughing End Mill 3/4 in 4 Flute Cobalt

Product Description

The HERTEL 91192914 is a single-end roughing end mill designed for aggressive material removal in milling applications. Built from M42 cobalt high-speed steel and coated with Titanium Nitride (TiN), it delivers extended tool life and heat resistance under heavy cutting loads. The 3/4-inch diameter, 4-flute, coarse-pitch geometry breaks chips efficiently and reduces cutting forces on the workpiece. With a 1.625-inch length of cut and 3.75-inch overall length, this tool suits standard vertical and horizontal milling setups. Center-cutting capability allows plunge entry. Right-hand cutting and right-hand flute direction are standard for conventional milling machine spindles.

This end mill is suited for shops and maintenance machining environments where cobalt tooling is specified for harder steels, stainless, and tough alloys that would accelerate wear on standard HSS tools. It fits 3/4-inch collets or end mill holders on manual knee mills, CNC machining centers, and bridgeport-style machines. The roughing profile makes it a first-pass tool for removing bulk stock before finishing passes with a standard end mill. Machinists, tool-and-die workers, and maintenance technicians are the primary users.

Key Features

• M42 cobalt steel construction for improved heat and wear resistance over standard HSS
• Titanium Nitride (TiN) coating extends tool life and reduces friction
• Coarse-pitch roughing geometry breaks chips and reduces cutting forces
• Center-cutting design allows direct plunge entry without pre-drilling
• Right-hand cut and right-hand flute direction for standard milling spindles
• Single-end configuration with 3/4-inch shank for direct collet or end mill holder mounting

Compatibility

Designed for use in 3/4-inch end mill holders, collet chucks, or Weldon-style holders on vertical and horizontal milling machines accepting 3/4-inch shank tooling.

Installation Notes

Installation should be performed by a qualified machinist following the machine tool manufacturer's tooling guidelines. Ensure the spindle is fully stopped and the machine is powered down before changing tooling. Seat the shank fully in the holder and torque set screws to the holder manufacturer's specification using the correct hex key. Confirm runout with a dial indicator before beginning cuts when precision is required.