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Powdered-Metal Corner-Radius End Mills
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Powdered-metal corner-radius end mills are tougher and less likely to break than high-speed steel or cobalt end mills. They are used for milling highly abrasive materials. 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.