Hertel 91192203 Roughing End Mill 3/4 in Cobalt 3 Flute

Product Description

The HERTEL 91192203 is a single-end roughing end mill designed for aggressive material removal in ferrous and non-ferrous metals. Built from M42 cobalt high-speed steel, it delivers superior heat and wear resistance compared to standard HSS tooling. The coarse-pitch flute geometry generates smaller chips and reduces chatter during heavy cuts. At 0.75 inches in diameter with a 1.625-inch length of cut and a 3.875-inch overall length, this tool fits standard milling machine and CNC machining center spindles with a 0.75-inch shank. It arrives in a bright, uncoated finish and is ready for use as received. Machinists and tool-room professionals install this mill for roughing passes before finishing with a smooth-flute end mill.

This end mill is suited for roughing operations in job shops, production floors, and maintenance machining environments. The right-hand cutting direction and right-hand flute spiral are standard for conventional and climb milling on vertical mills, knee mills, and CNC machining centers. The centercutting geometry allows plunge entry into the workpiece, adding flexibility for slot entry and pocket operations. It performs in steel, stainless, and harder alloy materials where cobalt tooling is preferred over carbide for interrupted cuts or less-rigid setups.

Key Features

• M42 cobalt construction for elevated heat resistance and extended tool life in ferrous alloys
• Coarse-pitch roughing geometry reduces cutting forces and minimizes chatter on heavy passes
• Centercutting design enables direct plunge entry without a pre-drilled start hole
• Right-hand cut and right-hand helix for standard milling machine spindles
• Bright uncoated finish — no coating adds-risk of flaking during aggressive cuts
• Single-end configuration with a 0.75-inch straight shank for common collet and end mill holder fitment

Compatibility

Designed as an OEM-style solid-shank roughing end mill compatible with standard 0.75-inch end mill holders, ER collets, and side-lock holders used on vertical mills and CNC machining centers.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the machine spindle is fully stopped and the power source is locked out before changing tooling. Seat the shank fully into the holder to the recommended minimum engagement depth and torque the set screw or collet nut to the holder manufacturer specification. Inspect the cutting edges for chips or damage before each use and replace the tool when surface finish or chip formation degrades.