How to Choose Turning Insert Grades by Workpiece Material

The right insert grade reduces flank wear, chipping, and unpredictable tool life. Start with the workpiece material, then adjust for interrupted cuts, coolant, and surface finish requirements.

Starting points

• Use P grades as a starting point for general steel.
• Use M grades for stainless steel where heat and toughness matter.
• Use K grades for cast iron and abrasive wear resistance.