Seco 02959959 Carbide Turning Insert DNMU333-M3 TP1501

Product Description

The SECO 02959959 is a multi-tipped carbide turning insert in the DNMU-M3 series, designed for precision metal cutting in CNC turning applications. It carries the industry standard designation DNMU333-M3 and manufacturer grade TP1501, featuring a CVD-applied Duratomic coating of TiCN, Al2O3, and Cr for extended tool life and thermal resistance. The insert has a 55-degree diamond shape, a 3/8-inch inscribed circle (0.3750 inches), a 0.0472-inch corner radius (3/64 inch), and an overall length of 0.9134 inches. With four cutting edges and a negative rake geometry, it delivers consistent performance in steel and cast iron applications where tool economy and surface finish are critical.

This insert is suited for use on CNC lathes and turning centers in both production and job-shop environments. It supports back turning, boring, facing, and standard OD turning operations. The neutral hand orientation makes it adaptable across a wide range of setups. Primary workpiece material is steel (ISO P code), with secondary suitability for cast iron and hard materials (ISO K and H codes). Material grades P10 and P20 apply, making it appropriate for light to medium roughing and finishing cuts. The M3 chip breaker geometry is optimized for controlled chip formation during interrupted and continuous cuts.

Key Features

• CVD Duratomic coating (TiCN, Al2O3, Cr) for thermal stability and wear resistance in steel and cast iron cutting
• 55-degree diamond insert shape with four usable cutting edges for cost efficiency
• M3 chip breaker with chamfered and honed cutting edge style for reliable chip control
• Neutral hand orientation supports flexible setup on standard turning and boring operations
• Maximum depth of cut up to 0.4094 inches suitable for medium-stock roughing passes
• Compatible with clamp, pin, and lever-lock insert holding methods

Compatibility

Designed as an OEM-style replacement or direct application insert for toolholders accepting DNMU-style inserts with a 55-degree diamond shape, 3/8-inch inscribed circle, and clamp, pin, or lever-lock holding methods per ANSI and ISO standards.

Installation Notes

Installation is performed by machining professionals or CNC setup technicians. Power down and lock out the machine spindle before seating or indexing the insert. Ensure the insert pocket and seating surfaces are clean and free of chips before clamping. Follow the toolholder manufacturer torque and clamping specifications for the specific holding method (clamp, pin, or lever lock) being used.