Seco 03275990 Turning Insert CNMG432-M3 TM2501 Carbide

Product Description

The SECO 03275990 is a CNMG432-M3 indexable turning insert manufactured from solid carbide with a multilayer CVD-applied Duratomic coating of TiCN, Al2O3, and Cr. It carries the TM2501 grade designation and is engineered for medium to semi-finishing turning operations on stainless steel and steel. The insert features a diamond 80-degree shape with a neutral hand orientation, 4 usable cutting edges, a 0.5 inch inscribed circle, and a 0.0315 inch corner radius. The chamfered and honed cutting edge style combined with the M3 chipbreaker geometry supports stable chip control across a range of depths of cut up to 0.4756 inches. Licensed machinists and CNC operators install this insert in compatible turning toolholders for production and job-shop environments.

This insert is suited for external and internal turning, facing, and boring operations on CNC lathes and turning centers. Its primary application is stainless steel (ISO workpiece material code M, material grades M25, M30, M35), with steel (ISO code P) as the secondary workpiece material. The negative rake geometry and N clearance angle are consistent with rigid setups where tool pressure and edge security are priorities. The M3 chipbreaker is optimized for medium-feed passes where reliable chip evacuation is critical, particularly when machining austenitic or duplex stainless grades.

Key Features

• CVD Duratomic multilayer coating (TiCN, Al2O3, Cr) for extended tool life on stainless and steel
• M3 chipbreaker geometry engineered for medium-feed turning and boring on difficult materials
• 4 indexable cutting edges per insert for cost-effective tooling consumption
• Chamfered and honed cutting edge style balances edge strength with surface finish capability
• Compatible with clamp, pin, and lever-lock insert holding methods
• Dual standard compliance: ANSI and ISO (ISO code CNMG120408-M3)

Compatibility

Designed as an OEM-style replacement turning insert for CNMG432 / CNMG120408 series toolholders that accept clamp, pin, or lever-lock holding methods with a 0.2028 inch hole diameter. Verify toolholder manufacturer specifications before ordering.

Installation Notes

Installation and indexing of this insert should be performed by a qualified machinist or CNC tooling technician. The machine spindle must be fully stopped and the turret locked out before indexing or replacing inserts. Use a calibrated torque wrench when re-seating the clamping screw to the toolholder manufacturer's specification — do not rely on feel alone. Inspect the insert pocket and seating surfaces for chips or debris before each index to prevent insert rocking and premature edge failure.