Insert Grades Insert GradesA1 to A38 A A A Grades for Turning …………………………………… A2 Grades for Milling ……………………………………… A3 Grade Comparison Chart  (CVD / PVD Coated Grades)……………………… A4  (Cermet, Cemented Carbide, Ceramic)………… A6  (CBN, Polycrystalline Diamond) ………………… A7 Chipbreaker Comparison Chart …………………… A8 Chipbreaker and Grade Selection Guide  For Steel Turning ………………………………… A10  For Stainless Steel Turning …………………… A14  For Cast Iron Turning …………………………… A16  For Exotic Alloy Turning ………………………… A18  For Hardened Steel Turning …………………… A20  For Non-Ferrous Metal Turning ………………… A22  For Small Lathes ………………………………… A24 Coated Carbide ……………………………………… A26 Cermet ………………………………………………… A29 Carbide ……………………………………………… A30 CBN …………………………………………………… A32 Polycrystalline Diamond …………………………… A34 Ceramic ……………………………………………… A36 Material Properties ………………………………… A37 A1