Mitsubishi CNMG120404-GK MC5015 Cast Iron Turning Insert (10pcs) 50 Degree Cutting Edge It has better resistance to

It has better resistance to thermal cracking

"No chip wrapping issues on 4140 steel

Model Nomenclature Decoder: S08K-STWCR09 (ISO / International Standard Chart Compliant)

BYS25 (Bronze Matrix) ISO M20 - M35 PVD Multi-Nano AlTiN Engineered for tough

⭐⭐⭐⭐⭐ "Top tier for stainless" - Alessia G

Mitsubishi CNMG120404-GK MC5015 Cast Iron Turning Insert (10pcs) 50 Degree Cutting Edge It has better resistance toCNMG120404 GK MC5015 Cast Iron Specialist MC5015 Abrasive Resistance GK Robust Geometry Optimized for Abrasive Cast Iron Environments MC5015 Grade (The Wear Barrier): The MC5015 is Mitsubishi's premium CVD grade for K Class (Cast Iron). Cast iron is notoriously abrasive; this grade combats that with a specialized thick alumina ($Al_2O_3$) coating that provides industry leading flank wear resistance. This allows for significantly higher cutting speeds