Hertel 91197574 Roughing End Mill 12mm 4 Flute Cobalt

Product Description

The HERTEL 91197574 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, it delivers the toughness and heat resistance needed for ferrous and stainless materials. The cutter measures 12 mm in diameter with a 53 mm length of cut and 110 mm overall length. Four right-hand flutes with a fine pitch configuration drive efficient chip evacuation while reducing chatter during heavy roughing passes. Center-cutting geometry allows plunge entry as well as conventional and climb milling cuts.

This end mill is suited for job shop and production machining environments where roughing passes precede finishing operations. It performs in vertical machining centers, knee mills, and CNC milling applications across general metalworking, toolroom, and maintenance repair operations. The cobalt substrate handles elevated cutting temperatures better than standard HSS, making it a practical choice for harder alloy steels, tool steels, and stainless grades where carbide is not required.

Key Features

• M42 cobalt high-speed steel construction for superior heat and wear resistance
• 12 mm diameter with 12 mm shank for direct collet or end mill holder mounting
• 53 mm length of cut provides reach for deeper pocketing and slotting operations
• Four right-hand flutes with fine pitch for controlled chip load during heavy roughing
• Center-cutting design permits plunge milling without a pre-drilled entry hole
• Bright, uncoated finish compatible with cutting fluid or dry machining setups

Compatibility

Designed as a standard 12 mm shank roughing end mill compatible with collet chucks, Weldon-style end mill holders, and hydraulic holders sized for 12 mm shanks used in CNC and manual milling machines.

Installation Notes

Installation should be performed by a qualified machinist or toolroom professional. Power down and lock out the spindle before inserting or removing the end mill from the holder. Ensure the shank is fully seated to the minimum insertion depth required by the holder and that all set screws or collet nuts are torqued according to the toolholder manufacturer's specifications. Inspect the cutting edges for chips or damage before each use, and verify spindle RPM and feed rate match the calculated values for the workpiece material and diameter.