Cubic boron nitride insert. | |||
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Cubic boron nitride insert. This very expensive ($70 list, $20 on eBay) milling bit insert is only about half an inch wide, but incredibly hard and long-wearing in applications involving continuous cutting of hardened steels (grade BNX20). For that price it better be! It has a cubic boron nitride coating over a cemented tungsten carbide base. Source: eBay seller cutting_edge _tool Contributor: Theodore Gray Acquired: 17 April, 2009 Text Updated: 17 April, 2009 Price: $20 Size: 0.6" Purity: <10% | |||
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