Sumitomo 16JRCTU Pcbn Turning Insert Diamond 55 Degree

Product Description

The SUMITOMO 16JRCTU is an uncoated Polycrystalline Cubic Boron Nitride (PCBN) turning insert designed for precision machining of hardened steel. Cataloged under ANSI code 2NUDNGA431 and ISO code 2NU-DNGA150404, this insert features a 55-degree diamond shape, a 0.5-inch inscribed circle, and a 1/64-inch (0.0156 inch) corner radius. The negative rake geometry and DNGA-style seating deliver controlled cutting forces and predictable tool life in demanding hard-turning applications. It is installed by machinists and CNC tooling technicians working in precision metalworking environments.

This insert is suited for hard-turning operations on hardened steel workpieces, classified under workpiece material code H. The 2NU-DNGA insert style and clamp-plus-pin holding method make it compatible with standard DNGA toolholders used in production and job-shop turning centers. With two cutting edges per insert, it offers back-up cutting capability before replacement. Typical applications include finish turning of hardened shafts, bearing races, and similar components where tight tolerances and fine surface finish are required.

Key Features

• PCBN (Polycrystalline Cubic Boron Nitride) insert material for hard-turning performance on hardened steel
• Uncoated BN2000 grade for consistent edge integrity in high-hardness workpiece materials
• 55-degree diamond insert shape (Shape Code D) with negative rake for stable, chatter-resistant cuts
• 0.5-inch inscribed circle and 3/16-inch insert thickness for rigid seating in compatible toolholders
• Two cutting edges per insert for extended tool utilization
• Meets ANSI and ISO 13399 standards for interchangeable insert identification

Compatibility

Designed for use in standard DNGA-style toolholders with clamp and pin holding methods. Compatible with turning centers and CNC lathes set up for negative-rake DNGA inserts with a 0.5-inch inscribed circle. Intended primary workpiece material is hardened steel (ISO material code H).

Installation Notes

PCBN turning inserts should be seated and clamped according to the toolholder manufacturer specifications using the specified clamp-and-pin holding method. Always power down and lock out the machine spindle before changing inserts. Handle PCBN inserts carefully, as the cutting edges are brittle and susceptible to chipping from improper seating or mechanical shock. Verify toolholder and insert compatibility by confirming ANSI or ISO insert codes prior to installation.