Grade TN10PTN20PTN30PTN15M WIDIA™ VariTurn™ Grades and Grade Descriptions Coatings provide high-speed P Steel capability and are engineered M Stainless Steel for finishing to heavy roughing. K Cast Iron N Non-Ferrous S High-Temp Alloys H Hardened Materials wear resistance toughness Coating Grade Description 05 10 15 20 25 30 35 40 45 P Coated carbide. MTCVD-TiN-TiCN-Al2O3-TiN. Ideal for light finishing to medium K machining applications. Superior wear resistance. HC-P10 P Coated carbide. MTCVD-TiN-TiCN-Al2O3-TiN. Great general-purpose turning grade K for steels. Ideal for semi-finishing to moderately heavy roughing. HC-P20 P Coated carbide. MTCVD-TiN-TiCN-Al2O3-TiN. Tough carbide grade. Ideal for roughing and heavy roughing applications. HC-P30 P M Coated carbide. MTCVD-TiN-TiCN-Al2O3-TiN. Ideal for general-purpose machining of stainless steels. S HC-M15 B120 widia.com