Kennametal 6676370 Corner Radius End Mill 1/4 in 4 Flute

Product Description

The KENNAMETAL 6676370 is a solid carbide corner radius end mill designed for high-performance milling in demanding materials including steel, stainless steel, cast iron, superalloys, titanium, and hard materials. It carries a 1/4 inch diameter with a 0.015 inch corner radius and four right-hand spiral flutes, delivering both roughing and finishing capability in a single tool. The AlTiN PVD coating provides thermal resistance and wear protection at elevated cutting temperatures. At 2.5 inches overall length with a 3/4 inch length of cut, this is a compact, rigid tool suited to close-tolerance work in machining centers and CNC milling setups.

This end mill is built for machinists and tooling professionals working in job shop, production, and aerospace environments where workpiece materials push tooling to its limits. The H1TE series geometry is optimized for steel and difficult-to-machine alloys. The straight cylindrical shank measures 1/4 inch in diameter, making it compatible with standard collet chucks, hydraulic sleeves, and shrink-fit holders. Per manufacturer data, it is compatible for use with HC 20M through HC 32M hydraulic sleeves metric with inch bores and HC-CV Form AD holders.

Key Features

• Solid carbide submicron-grade construction for rigidity and wear resistance in hard and abrasive materials
• AlTiN PVD coating extends tool life in dry and semi-dry cutting of steel, stainless steel, and superalloys
• 0.015 inch corner radius reduces stress concentration at the cutting edge and improves surface finish
• Centercutting design allows direct plunge entry without a pre-drilled pilot hole
• Four-flute right-hand spiral configuration supports both roughing and finishing passes
• H1TE series geometry rated for P, M, K, S, and H workpiece material classifications

Compatibility

Compatible with HC 20M through HC 32M hydraulic sleeves metric with inch bores and HC-CV Form AD holders. The 1/4 inch straight cylindrical shank fits standard collet and hydraulic toolholding systems accepting that bore size.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Ensure the machine spindle is fully stopped and the tool changer or spindle is locked before changing tooling. Verify runout at the holder before cutting, as excessive runout accelerates edge wear with carbide tooling. Follow the toolholder manufacturer torque specifications for collet nuts; do not over-tighten hydraulic or shrink-fit holders beyond their rated clamping range.