ISCAR Turning Grades Chart Grades ISO Coating Layers P05-P25 IC20N M05-M15 P10-P30 IC30N M10-M20 H10-H25 M10-M30 IC08 N10-N25 S10-S30 MATERIALS AND GRADES M10-M25 K10-K20 IC20 N05-N25 S05- S20 H05-H15 IB05S S05 IB10H H10 IB10HC H10 TiN IB10S S10 IB20H H20 IB25HA H25 IB25HC H25 TiN K01-K10 IB50 H01-H10 K05-K15 IB55 H10-H25 K01-K15 IB85 K05-K15 IB90 S01-S10 ID5 N01-N10 CERMET UNCOATED CBN PCD 558 ISCAR