Seco 03277077 Turning Insert CNMG432W-MF4 TM2501 Carbide

Product Description

The SECO 03277077 is a CNMG-style indexable turning insert designed for general turning, facing, and boring operations on CNC lathes and turning centers. It carries the industry designation CNMG432W-MF4 and is manufactured in grade TM2501, a CVD-coated carbide substrate featuring a multilayer TiCN, Al2O3, and Cr Duratomic coating. The insert has an 80-degree diamond shape, a 0.5-inch inscribed circle, a 0.0315-inch corner radius, and 4 usable cutting edges. The MF4 chip breaker geometry and chamfered-and-honed cutting edge suit interrupted and continuous cuts in stainless steel and steel. Licensed machinists and CNC operators install and index this insert at the machine.

This insert is optimized for primary use in stainless steel (ISO material code M) and secondary use in steel (ISO material code P), covering material grades M25, M30, and M35. The neutral hand orientation makes it suitable for both right-hand and left-hand toolholders. Typical applications include finish-to-medium roughing operations on turned components in aerospace, energy, and general manufacturing environments. The wiper edge feature supports improved surface finish at standard feed rates. Multi-use capability spans boring, facing, and turning within a single insert style, reducing the number of grades stocked per machine.

Key Features

• CVD Duratomic multilayer coating: TiCN, Al2O3, and Cr for heat and wear resistance in stainless steel cutting
• MF4 chip breaker geometry engineered for stainless steel and steel with consistent chip control
• 4 cutting edges per insert reduces per-edge tooling cost
• Wiper edge design supports improved surface finish without reducing feed rate
• Chamfered and honed cutting edge style balances edge strength and sharpness
• Compatible with clamp, pin, and lever-lock insert holding methods for broad toolholder flexibility
• Negative rake geometry with 0-degree relief angle for maximum edge support in interrupted cuts

Compatibility

Designed for CNMG-style toolholders using clamp, pin, or lever-lock holding methods. Conforms to ANSI and ISO standards; ISO equivalent designation is CNMG120408W-MF4. Verify toolholder bore clearance against the 0.2028-inch hole diameter before installation.

Installation Notes

Indexable inserts are installed and serviced by qualified machinists or CNC tooling technicians. Power down and lock out the machine spindle before indexing or replacing inserts. Seat the insert fully against the toolholder pocket and torque the clamping screw per the toolholder manufacturer specification. Inspect the insert seat and shim for damage each time the insert is indexed to prevent premature edge failure.