Seco 02959954 Turning Insert DNMU331-M3 TP2501 Carbide

Product Description

The SECO 02959954 is a solid carbide turning insert in the DNMU-M3 series, designed for high-productivity metal cutting in CNC lathe and turning center applications. Identified by industry standard number DNMU331-M3 and manufactured to Duratomic grade TP2501, this insert features a CVD-applied multilayer coating of TiCN, Al2O3, and Cr for extended tool life and thermal resistance. The 55-degree diamond insert shape (shape code D) provides a balance of strength and accessibility in the cutting zone. With 8 available cutting edges per insert and an M3 chip breaker geometry with a chamfered and honed cutting edge, it delivers consistent chip control across a range of feed rates and depths. The insert weighs 0.01 pounds.

This insert is suited for turning, facing, boring, and back turning operations on steel as the primary workpiece material (ISO P), with secondary applications in stainless steel (ISO M) and cast iron (ISO K). It is appropriate for both roughing and semi-finishing passes, with material grades covering P10, P20, P30, and P35. The negative rake and neutral hand make it compatible with standard DNMU-style toolholders using clamp, pin, or lever lock holding methods. It is well-suited for production environments where consistent insert performance and multi-edge economy are priorities. This insert conforms to both ANSI and ISO standards.

Key Features

• CVD Duratomic multilayer coating (TiCN, Al2O3, Cr) for thermal stability and wear resistance
• 8 cutting edges per insert for cost-efficient production use
• M3 chip breaker geometry with chamfered and honed cutting edge style
• Negative rake, neutral hand — fits standard DNMU clamp, pin, and lever lock toolholders
• Rated for steel, stainless steel, and cast iron workpiece materials
• Meets ANSI and ISO standards; ISO code DNMU110404-M3

Compatibility

Designed for use in DNMU-style toolholders that accept clamp, pin, or lever lock holding methods. Compatible toolholders must accommodate a 3/8-inch inscribed circle insert with a 0-degree relief angle (clearance code N) and tolerance code M. Suitable for multi-use applications including turning, facing, boring, and back turning on steel, stainless steel, and cast iron workpieces.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Ensure the machine spindle is fully stopped and the toolholder is secure before seating or indexing the insert. Verify that the toolholder clamp, pin, or lever lock mechanism is rated for the DNMU insert style and that the seating pocket is clean and free of chips before mounting. Follow the machine tool manufacturer and toolholder manufacturer guidelines for clamping torque and insert retention.