Seco 03273976 VNMG331-MF4 TM2501 Carbide Turning Insert

Product Description

The SECO 03273976 is a VNMG331-MF4 series indexable turning insert manufactured from solid carbide and finished with a CVD-applied Duratomic multilayer coating of TiCN, Al2O3, and Cr. Rated at material grade M25/M30/M35, it is designed primarily for machining stainless steel and is also suitable for general steel applications. The insert features a 35-degree diamond shape, a 3/8-inch inscribed circle, and a 1/64-inch corner radius. With four cutting edges and an MF4 chip breaker geometry, it delivers consistent chip control in finishing and medium turning operations. Licensed machinists and CNC operators install this insert in compatible toolholders for production turning work.

This insert is suited for use in CNC turning centers and manual lathes performing back turning, facing, profiling, and general turning operations. Its negative rake geometry and chamfered-and-honed cutting edge style make it appropriate for interrupted and continuous cuts in stainless steel and steel workpieces. The MF4 chip breaker geometry is optimized for finishing to medium stock removal passes where controlled chip evacuation is critical. It is identified under ISO code VNMG160404-MF4 and conforms to both ANSI and ISO indexable insert standards.

Key Features

• Solid carbide substrate with CVD Duratomic multilayer coating: TiCN, Al2O3, and Cr for extended tool life in stainless steel
• 35-degree diamond insert shape (Shape Code V) with negative rake for strong cutting edge geometry
• MF4 chip breaker designed for finishing and medium turning with controlled chip flow
• Four cutting edges per insert; neutral hand orientation for flexible toolholder compatibility
• Chamfered and honed cutting edge style reduces chipping on entry and exit
• Compatible with clamp, pin, and lever lock holding methods
• Conforms to ANSI and ISO standards; ISO code VNMG160404-MF4

Compatibility

Designed as an OEM-style replacement insert for VNMG-style toolholders accepting a 3/8-inch inscribed circle, 35-degree diamond insert with a 0.1500-inch hole diameter. Compatible with clamp, pin, and lever lock insert holding methods per ANSI and ISO VNMG331 specifications.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. The machine spindle must be fully stopped and locked out before indexing or replacing inserts. Use the appropriate torque wrench and manufacturer-specified clamping hardware for the toolholder style; do not overtighten clamping screws, as this can fracture the carbide substrate. Inspect the insert seat and chip pocket for debris before seating a new insert to ensure full contact and accurate positioning.