Kennametal 3580840 Corner Radius End Mill 1/4 in 5 Flute

Product Description

The KENNAMETAL 3580840 is a solid carbide corner radius end mill engineered for high-performance milling in demanding materials. It features a 1/4 inch diameter, a 3/4 inch length of cut, and a 0.015 inch corner radius that reduces stress concentrations at workpiece edges and extends tool life. The 5-flute, single-end geometry with a high helix spiral flute design promotes efficient chip evacuation while maintaining a strong core. An AlTiN (aluminum titanium nitride) PVD coating provides thermal resistance and hardness, making this end mill well suited for dry or near-dry cutting conditions. Machinists and CNC operators in tool rooms, job shops, and production environments rely on this tool for both roughing and finishing passes.

This end mill is designed for cutting steel, stainless steel, cast iron, superalloys, titanium, and hard materials. Its 1/4 inch straight-cylindrical shank, 2.5 inch overall length, and normal pitch make it compatible with standard collet chucks and hydraulic tool holders. It is specified for use with HC 20M through HC 32M hydraulic sleeves metric with inch bores and HC-CV Form AD holders. Right-hand flute direction and right-hand cutting direction are standard. The UCDE series designation places this tool in Kennametal's submicron carbide grade lineup, optimized for tight-tolerance finish work and intermediate-stock roughing in difficult alloys.

Key Features

• 0.015 inch corner radius reduces edge chipping and improves surface finish on workpiece corners
• AlTiN PVD coating delivers high heat resistance for cutting steel, stainless steel, cast iron, superalloys, titanium, and hard materials
• 5-flute spiral geometry supports both roughing and finishing material removal in a single tool
• Submicron solid carbide grade provides rigidity and wear resistance at elevated cutting speeds
• High helix angle promotes chip flow and reduces cutting forces in tough alloys
• Straight-cylindrical 1/4 inch shank fits standard collets and hydraulic shrink-fit holders

Compatibility

Specified for use with HC 20M through HC 32M hydraulic sleeves metric with inch bores and HC-CV Form AD tool holders. Suitable for machining steel, stainless steel, cast iron, superalloys, titanium, and hard materials (ISO material codes P, M, K, S, H).

Installation Notes

Installation and tool changes should be performed by a qualified machinist or CNC operator with the spindle fully stopped and machine in an e-stop or locked-out state. Ensure the shank is clean and free of chips or oil contamination before seating in the collet or hydraulic holder, and torque the retention nut or holder to the tool holder manufacturer specification. Confirm runout with a dial indicator before cutting, as excessive runout accelerates wear on small-diameter carbide tools. Follow applicable shop safety standards and machine manufacturer guidelines for high-speed milling operations.