OverviewThe CNMG 120412-PF 4225 is a double-sided, negative-rake turning insert from sandvikss Coromant's T-Max® P range. It combines an 80° rhombic body with a 1.2 mm corner radius and the PF finishing chipbreaker, giving a sharp, low-force cutting action for finish turning, profile turning and light facing operations on steel components.The insert is produced in GC4225, a CVD-coated carbide grade built on a gradient substrate. The coating sequence — MT-Ti(C,N) / Al₂O₃ / TiN