Hertel 81825168 Square End Mill 1/4 in 4 Flute Cobalt

Product Description

The HERTEL 81825168 is a 4-flute cobalt square end mill designed for milling ferrous and hard materials in machining applications. Built from M42 cobalt high-speed steel, it offers greater heat and wear resistance than standard M2 HSS tooling, making it well suited for stainless steel, hardened alloys, and tough aerospace-grade materials. The cutter measures 0.25 inches in diameter with a 1.25-inch length of cut and a 3/8-inch shank diameter. A 30-degree right-hand spiral flute geometry promotes efficient chip evacuation and smooth cutting action. The uncoated finish and regular-length configuration make it a straightforward replacement or stocking tool for general CNC and manual milling setups.

This end mill fits conventional knee mills, CNC machining centers, and manual milling machines where a 3/8-inch collet or end mill holder is in use. It is intended for slotting, profiling, and peripheral milling in shop environments that regularly machine difficult-to-cut materials. The right-hand cut and right-hand flute orientation match standard spindle rotation on most vertical milling machines. Machinists and tool-and-die professionals in job shops, production facilities, and maintenance departments will find this a practical option for everyday metal removal tasks.

Key Features

• M42 cobalt HSS construction provides elevated heat resistance compared to standard HSS end mills
• 4-flute design increases feed rate capability and improves surface finish on ferrous materials
• 30-degree helix angle promotes effective chip flow during slotting and profiling cuts
• Right-hand cut and right-hand flute orientation compatible with standard vertical milling spindles
• Uncoated finish allows easy regrinding and is suitable for use with cutting fluids
• Non-centercutting geometry — not intended for plunge cuts directly into solid stock

Compatibility

Designed as a standard-shank cobalt square end mill for use in 3/8-inch collets, end mill holders, or Weldon-style holders on CNC machining centers and manual knee mills.

Installation Notes

Installation is performed by a machinist or toolroom technician. Ensure the machine spindle is fully stopped and locked out before changing tooling. Seat the 3/8-inch shank fully in the holder and torque the set screw or collet nut to the tool holder specification. Confirm runout with a dial indicator before beginning a cut, as excessive runout will accelerate tool wear on cobalt tooling.