Kennametal 6676439 Corner Radius End Mill 5/8 in 4 Flute Altin

Product Description

The KENNAMETAL 6676439 is a solid carbide corner radius end mill designed for high-performance material removal in demanding machining environments. Built to the H1TE series specification, it features a 5/8 inch cutting diameter, a 0.03 inch corner radius, and a 2-1/4 inch length of cut. The AlTiN PVD coating provides elevated heat resistance and extended tool life at high cutting speeds. With four right-hand spiral flutes and a centercutting geometry, this tool handles both roughing and finishing passes in a single setup. It is installed and operated by CNC machinists and toolroom professionals running vertical or horizontal milling equipment.

This end mill is rated for use in steel, stainless steel, cast iron, superalloys, titanium, and hard materials. The long-length configuration and 36-degree helix angle make it well suited for deep-pocket milling, slotting, and profiling operations where reach and chip evacuation are critical. It is compatible with HC 1/2 through HC 1 1/4 hydraulic sleeves with inch bores, making it a direct fit for hydraulic toolholding systems common in production environments.

Key Features

• AlTiN PVD coating for heat resistance and extended tool life in ferrous and hard materials
• 0.03 inch corner radius reduces stress concentration and improves edge strength at corners
• Centercutting design allows plunge entry without a pre-drilled pilot hole
• Four right-hand spiral flutes with normal pitch for balanced roughing and finishing capability
• Submicron carbide grade provides fine grain structure and resistance to edge chipping
• Straight-cylindrical shank at 5/8 inch diameter for secure clamping in hydraulic or collet toolholders

Compatibility

Compatible with HC 1/2 through HC 1 1/4 hydraulic sleeves with inch bores. Designed as an OEM-specification solid carbide corner radius end mill in the KENNAMETAL H1TE series for use in CNC milling applications involving steel, stainless steel, cast iron, superalloys, titanium, and hard materials.

Installation Notes

Installation is performed by a qualified CNC machinist or toolroom technician. Ensure the spindle is fully stopped and the machine is placed in an e-stop or lockout-tagout state before changing tooling. Seat the shank fully in the toolholder and torque retention screws or hydraulic clamping to the toolholder manufacturer specification. Inspect the cutting edge for chips or coating damage before each use, and confirm runout with a dial indicator when tight tolerances are required.