Kennametal 6676390 Corner Radius End Mill 3/8 in 4 Flute Altin

Product Description

The KENNAMETAL 6676390 is a solid carbide corner radius end mill engineered for high-performance metal removal in demanding machining environments. It features a 3/8 inch diameter with a 0.015 inch corner radius, a 1-1/2 inch length of cut, and a 4 inch overall length on a straight cylindrical 3/8 inch shank. The four-flute, right-hand spiral design supports both roughing and finishing passes in a single setup. An AlTiN (PVD) coating provides thermal resistance and wear protection at elevated cutting speeds. This tool is manufactured from submicron-grade solid carbide and belongs to the H1TE series. It is installed by machinists and CNC programmers working in job shops, production facilities, and tool rooms.

This end mill is suited for milling steel, stainless steel, cast iron, superalloys, titanium, and hard materials. Its long-length geometry makes it appropriate for applications requiring extended reach into pockets, slots, or stepped features. The centercutting design allows plunge entry, adding flexibility to the operation. Normal pitch flute spacing and a 36-degree helix angle support chip evacuation across a range of material conditions. It is compatible with HC 1/2 through HC 1-1/4 hydraulic sleeves inch with inch bores.

Key Features

• 3/8 inch diameter with 0.015 inch corner radius for blended edge transitions and reduced stress concentration
• AlTiN PVD coating for high-temperature wear resistance in ferrous and hard materials
• Submicron-grade solid carbide substrate for rigidity and edge retention
• Four right-hand spiral flutes support both roughing and finishing in a single operation
• Centercutting geometry allows direct plunge entry without a pre-drilled pilot hole
• Long-length (H1TE series) design provides 1-1/2 inches of usable cut length on a 4 inch overall tool

Compatibility

Compatible with HC 1/2 through HC 1-1/4 hydraulic sleeves inch with inch bores. Designed for use in CNC machining centers and manual mills with a 3/8 inch straight-cylindrical shank toolholder.

Installation Notes

This tool is installed by machinists using a compatible 3/8 inch toolholder or hydraulic sleeve. Verify runout and toolholder clamping torque per the machine tool manufacturer specifications before engaging the cut. Confirm spindle direction is set to right-hand rotation before operation. Do not exceed the recommended depth of cut for the material being machined without consulting the applicable cutting data for the H1TE series.