Advanced Material Inserts Grade Numbering System Grade Numbering System — PcBN and PCD W B H 30 P Brand Cutting Material Application Range Coating Material Group Range WIDIA™ B = CBN 05 = fine finishing U = Uncoated D = PCD 10 = finishing C = CVD Coated 1520==} medium to roughing P = PVD Coated 2530==} roughing P SteelMStainless Steel 354045===} heaviest roughing50= K Cast Iron N Non-Ferrous S High-Temp Alloys H Hardened Materials U Universal Machining widia.com B165