Hertel 91197244 Roughing End Mill 1-1/4 in 6 Flute Cobalt

Product Description

The HERTEL 91197244 is a single-end roughing end mill designed for aggressive material removal in milling operations. Built from M42 cobalt high-speed steel with a bright, uncoated finish, this tool handles tough ferrous and non-ferrous workpiece materials where heat resistance and edge retention are priorities. The 6-flute fine-pitch geometry produces a finer surface finish than coarse-pitch roughers while still clearing chips effectively. With a 1.25-inch milling diameter, a 2-inch length of cut, and a 0.75-inch shank, it seats in standard milling chucks, collet holders, and tool holders common in job shops and production environments. Licensed machinists and toolroom operators are the primary users.

This end mill fits general-purpose vertical and horizontal milling applications where a cobalt rougher is specified over carbide due to toughness requirements or interrupted-cut conditions. Typical setups include roughing passes on steel, stainless, and high-temp alloys on manual knee mills and CNC machining centers. The 4.25-inch overall length suits standard short-reach setups without extended holders. Right-hand cut and right-hand flute direction are standard for conventional and climb milling on most machines.

Key Features

• M42 cobalt HSS construction for elevated heat resistance and edge toughness
• 6-flute fine-pitch design for improved finish quality during roughing passes
• Bright, uncoated surface finish suitable for use with most cutting fluids
• Non-centercutting geometry -- requires a pre-drilled or pre-bored entry
• Right-hand cut and right-hand flute direction for standard milling setups
• Single-end configuration with 0.75-inch shank for secure tool holding

Compatibility

Designed as a direct-fit roughing end mill for milling chucks, ER collet systems, and Weldon-style holders accepting a 0.75-inch shank diameter. Verify spindle direction and holder runout tolerance before use.

Installation Notes

Installation is performed by qualified machinists or toolroom personnel. Power down and lock out the machine spindle before inserting or removing the tool. Seat the shank fully to the recommended engagement depth in the holder and torque the retention fastener per the tool-holder manufacturer specification. Because this is a non-centercutting end mill, do not plunge directly into solid material; use a ramping, helical, or pre-drilled entry path.