Kennametal 6676389 Corner Radius End Mill 3/8 in 4 Flute Altin

Product Description

The KENNAMETAL 6676389 is a solid carbide corner radius end mill designed for precision milling in demanding machining environments. It features a 3/8-inch diameter, a 1-inch length of cut, and a 0.09-inch corner radius that reduces stress concentration at the tool tip and extends tool life in interrupted or high-load cuts. The 4-flute, right-hand spiral configuration with a 36-degree helix promotes efficient chip evacuation and supports both roughing and finishing operations in a single setup. An AlTiN PVD coating provides high heat and oxidation resistance, making this tool well suited for dry or near-dry cutting conditions. Licensed machinists and CNC programmers specify this end mill for high-material-removal-rate applications where dimensional accuracy is required.

The 6676389 is engineered for use on steel, stainless steel, cast iron, superalloys, titanium, and hard materials. Its centercutting geometry allows plunge entry, adding versatility on machining centers and CNC mills. The straight cylindrical shank measures 3/8 inch in diameter and is compatible with HC 20M through HC 32M hydraulic sleeves with inch bores. The single-end design and standard-length flute make it a practical choice for general-purpose profiling, contouring, and slotting operations where a radius corner is specified by the part drawing.

Key Features

• Solid carbide submicron-grain construction for rigidity and wear resistance in hard and abrasive materials
• AlTiN PVD coating supports elevated cutting temperatures and reduces built-up edge in steel and stainless steel
• 0.09-inch corner radius reduces tool stress and produces a controlled fillet without a secondary operation
• Centercutting design permits direct plunge entry without a pre-drilled pilot hole
• 36-degree helix angle promotes smooth chip flow and reduces cutting forces on the workpiece
• Rated for roughing and finishing, eliminating the need to switch tools mid-operation

Compatibility

Compatible with HC 20M through HC 32M hydraulic sleeves with inch bores. Suited for use on steel, stainless steel, cast iron, superalloys, titanium, and hard materials per Kennametal Series H1TE application guidelines.

Installation Notes

This end mill should be installed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully stopped and locked before changing tooling. Verify that the shank is fully seated and properly torqued in the tool holder according to the holder manufacturer's specifications. Confirm runout is within acceptable limits before beginning a cut, as excessive runout accelerates flute wear and can cause premature tool failure.