Hardened material MachiningPRODUCTS Narrow product search Material hardness HRC 55 or above HRC 55 or less Application Turning Milling Cutting conditions Continuous cut Light interruptions Heavy interruptions Insert material CeramiX Ceramic CBN NTK450For Hard Turning in Continuous Cuts | NTK CeramiX The ultimate ceramic grade for finishing hardened materials -" NTK CeramiX " ZC7/ZC4For continuous machining | Ceramic for machining materials 30 - 70 HRC Significant cost savings for high hardness materials B5K/B52For continuous-light interruption machining | CBN for machining hardened material High performance, low cost, versatile CBN B6K/B36For light to medium interrupted machining | CBN for machining hardened material High performance, low cost CBN B40For heavy interrupted machining | CBN for machining hardened material High performance, low cost CBN WA1For milling applications | Whisker ceramic for hardened materials Rapid material removal and long tool life for hard milling