MATERIALS AND GRADES UNCOATED USER GUIDE ISCAR Hole Making Grades Chart Grade ISO Grade Description Uncoated Layers Uncoated An uncoated, ultra-fine carbide grain size, which is characterized IC03 by high wear resistance and toughness. Used mainly formachining high-temperature superalloys and Titanium, may be S10-S20 applied to cutting hardened steel and cast iron. H15-H25 Base M10-M20 A hard-uncoated submicron grain size carbide grade, suitable IC07 for machining aluminum alloys and other non-ferrous materials at N05-N20 high cutting speeds. S10-S30 Base M10-M30 A tough uncoated submicron grain size carbide grade, suitable IC08 for steels, stainless steel and high temperature alloys at low N10-N25 cutting speeds. Good choice for non-ferrous materials. S10-S30 Base 492 ISCAR