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High-Speed Steel Corner-Radius End Mills
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High-speed steel corner-radius end mills offer good wear resistance for general purpose milling applications. They're more flexible and can absorb more shock and vibration than carbide, cobalt, or powdered-metal corner-radius end mills. Sometimes called bull-nose end mills, corner-radius end mills have a square nose with slightly rounded corners that help distribute cutting forces evenly to prevent damage to the end mill and extend its life. They are rotated against a workpiece to create a flat-bottomed groove with slightly rounded inside corners in milling applications that require a specific radius.