Seco 03280013 Turning Insert CNMG431-M3 TP25 Carbide

Product Description

The SECO 03280013 is a CNMG431-M3 series indexable turning insert designed for metal cutting operations in CNC lathes and turning centers. It is manufactured from solid carbide and carries a multilayer CVD coating consisting of TiCN, Al2O3, and Cr, corresponding to the TP25 manufacturer grade. The 80-degree diamond shape (CNMG insert style) provides a strong cutting edge geometry suited for general-purpose turning. With a 0.5 inch inscribed circle, a 0.5079 inch insert length, and a 0.0157 inch corner radius, this insert delivers consistent performance in medium to heavy stock removal. It is installed by machinists and CNC setup technicians working in production or job-shop environments.

This insert is suited for primary use on steel (ISO P20, P30, P35 material grades) and is also rated for secondary application on stainless steel and cast iron. Multi-use applications include boring, facing, and turning. The negative rake geometry with a chamfered and honed cutting edge style improves edge strength and reduces chipping when cutting harder or interrupted surfaces. The M3 chip breaker geometry supports reliable chip control across a range of feed rates and depths. Maximum depth of cut reaches 0.4921 inches, making it effective for both roughing and semi-finishing passes.

Key Features

• TP25 multilayer CVD coating (TiCN, Al2O3, Cr) for wear resistance and thermal stability
• 80-degree diamond insert shape with 4 cutting edges for extended tool life per insert
• M3 chip breaker geometry provides effective chip control on steel and stainless steel
• Negative rake with chamfered and honed edge reduces micro-chipping under load
• Compatible with clamp, pin, and lever lock insert holding methods
• Meets ANSI and ISO standards; ISO code CNMG120404-M3

Compatibility

Designed for use in CNMG-style turning toolholders that accept a 0.5 inch inscribed circle, 80-degree diamond insert with a hole diameter of 0.2028 inches. Compatible holding methods include clamp, pin, and lever lock systems. Industry standard number CNMG431-M3; ISO equivalent CNMG120404-M3. Suitable for ANSI- and ISO-compliant toolholder bodies rated for negative-rake CNMG inserts.

Installation Notes

Installation is performed by a qualified machinist or CNC tooling technician. Power down the machine and engage the spindle lock before seating or indexing the insert. Use the appropriate torque wrench and insert screw specified by the toolholder manufacturer — do not substitute fasteners. Verify insert seating and clamping security before resuming cuts, and confirm that depth-of-cut and feed rate settings remain within the insert's rated operating range.