Hertel 91196840 Roughing End Mill 3/16 in 4 Flute Cobalt

Product Description

The HERTEL 91196840 is a single-end roughing end mill designed for high-speed material removal in milling applications. Built from M42 cobalt high-speed steel, it carries a TiN coating that extends tool life and reduces friction at the cutting edge. The 3/16-inch diameter, 4-flute fine-pitch geometry produces a controlled chip load, making it well-suited for profiling and slotting operations where chatter control and surface finish matter. With a 1/2-inch length of cut and a 3/8-inch shank diameter, this tool fits standard end mill holders and collet chucks without adapters. Machinists, tool-and-die workers, and maintenance technicians are the primary users.

The 91196840 is intended for use on manual knee mills, CNC vertical machining centers, and benchtop milling machines where a small-diameter rougher is needed. The 3/16-inch cutting diameter makes it a practical choice for narrow slots, small pockets, and tight-contour roughing passes in steel, stainless, and other ferrous alloys. The fine pitch and right-hand cut and flute direction are consistent with conventional milling operations. Overall length is 2-3/8 inches, keeping tool deflection manageable at this diameter.

Key Features

• M42 cobalt HSS construction for improved heat and wear resistance over standard M2 tools
• TiN coating reduces friction and extends tool life in ferrous materials
• 4-flute fine-pitch design for controlled chip evacuation and reduced chatter during roughing
• Right-hand cut and right-hand flute direction for conventional milling setups
• 3/8-inch shank diameter fits standard ER and end mill holders without step-up adapters
• Single-end geometry with no centercutting — not designed for direct plunge entry

Compatibility

Designed as an OEM-style replacement or direct-use roughing end mill for standard 3/8-inch end mill holders and collet systems on manual and CNC milling equipment.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Secure the shank to the minimum recommended insertion depth in the holder and torque the drawbar or collet nut per the holder manufacturer specifications before spindle operation. Because this tool is not centercutting, avoid direct axial plunge cuts — use a ramping or helical entry strategy when interpolating pockets. Inspect the cutting edges for chipping or coating wear before each use.