Hertel 91197004 Roughing End Mill 3/8 in 4 Flute Cobalt

Product Description

The HERTEL 91197004 is a single-end roughing end mill designed for aggressive material removal in milling operations. Built from M42 cobalt high-speed steel, this 4-flute tool features a fine-pitch geometry and a Titanium Nitride (TiN) coating to extend tool life and reduce heat buildup during cut. The 3/8 inch diameter with a 3/8 inch length of cut makes it well suited for slotting and profiling in confined areas. Right-hand cutting and right-hand flute direction are standard. It is centercutting, allowing direct plunge entry. Machinists and tool-and-die professionals working in job shops, manufacturing facilities, or maintenance environments are the typical end users.

This end mill is used in vertical and horizontal milling machines as well as CNC machining centers where semi-finish and roughing passes are required. The cobalt M42 substrate handles harder workpiece materials better than standard M2 HSS, making it a practical choice for alloy steels, stainless steel, and cast iron applications. The TiN coating adds surface hardness and lubricity, helping maintain edge geometry over extended runs.

Key Features

• M42 cobalt steel construction for improved hardness and heat resistance over standard HSS
• Titanium Nitride (TiN) coating reduces friction and extends cutting edge life
• 4-flute fine-pitch roughing geometry for aggressive stock removal
• Centercutting design allows direct plunge milling without a pre-drilled entry hole
• Right-hand cut and right-hand helix for conventional milling setups
• 3/8 inch shank diameter matches common collet and end mill holder sizes

Compatibility

Designed as a direct-fit replacement-style single-end roughing end mill for use in standard 3/8 inch end mill holders, collet chucks, and milling machine spindles accepting 3/8 inch shank tooling.

Installation Notes

Installation should be performed by a qualified machinist following shop safety protocols. Ensure the milling machine spindle is fully stopped and locked out before inserting or removing the tool. Secure the shank to the full recommended insertion depth in the holder and torque the set screw or collet nut to the tool holder manufacturer specification. Inspect the cutting edges for chips or coating damage before each use.