Sumitomo 161NWD3 Pcbn Turning Insert Uncoated Triangle

Product Description

The SUMITOMO 161NWD3 is an uncoated Polycrystalline Cubic Boron Nitride (PCBN) turning insert designed for high-performance machining of difficult-to-cut materials. Manufactured to ANSI code NUTPG221 and ISO code NU-TPGN110304, this insert features a triangular shape with a 60-degree included angle, a 0.25-inch inscribed circle, and a 1/64-inch (0.0156-inch) corner radius. The positive rake geometry and 11-degree relief angle reduce cutting forces and heat buildup during interrupted or continuous turning operations. It is installed by machinists and CNC operators in production turning centers and manual lathes.

This insert is suited for turning operations on cast iron, hard materials, and superalloys in both production and job-shop environments. The BN1000 PCBN grade is selected specifically for its thermal stability and edge retention when cutting hardened ferrous parts or heat-resistant superalloy components. A single cutting edge and clamp-style holding method make setup and indexing straightforward. Typical applications include finishing and semi-finishing passes where dimensional accuracy and surface finish are critical.

Key Features

• PCBN (Polycrystalline Cubic Boron Nitride) insert material for extreme hardness and wear resistance
• Uncoated BN1000 grade optimized for cast iron, hard materials, and superalloys
• Triangular insert shape with 60-degree included angle and positive rake for reduced cutting forces
• 1/64-inch corner radius for controlled surface finish on finishing passes
• Clamp-style holding method compatible with standard TPG-series toolholders
• Compliant with ANSI and ISO 13399 standards for consistent tooling interchange

Compatibility

Designed as an OEM-style replacement or direct-use insert for TPG-series clamp-style toolholders accepting a triangular insert with a 0.25-inch inscribed circle and ANSI code NUTPG221.

Installation Notes

This insert is installed by qualified machinists or CNC tooling technicians. Always power down and lock out the machine spindle before indexing or replacing inserts. Use the appropriate torque wrench and clamping hardware specified by the toolholder manufacturer — do not overtighten the clamp screw, as PCBN inserts are brittle and susceptible to fracture from improper seating. Inspect the insert pocket and shim for chips or debris before seating the new insert.