Sumitomo 16JRCUP Pcbn Turning Insert 0.5in Diamond BN2000

Product Description

The SUMITOMO 16JRCUP is a Polycrystalline Cubic Boron Nitride (PCBN) turning insert in the CNMA series, designed for precision material removal on difficult-to-machine workpiece materials. This uncoated insert carries the BN2000 manufacturer grade and features an 80-degree diamond insert shape with a negative rake geometry. The 0.5-inch inscribed circle and 0.03125-inch corner radius are sized for standard CNMA toolholders. The insert holds a single cutting edge and is held by a clamp and pin method, making it compatible with rigid setups that demand consistent performance on hard or abrasive materials. Machinists and tool-and-die professionals working with CNC turning centers are the primary installers of this insert.

This insert is intended for turning applications on cast iron, hardened steel, and superalloys. Its PCBN construction makes it well-suited for finishing and semi-finishing passes where carbide inserts would wear prematurely. The neutral hand orientation allows flexible use in standard external turning operations. The ANSI code NUCNMA432 and ISO code NU-CNMA120408 confirm dimensional compliance with ANSI and ISO 13399 standards, simplifying toolholder pairing and cross-referencing in engineering documentation and CNC programming environments.

Key Features

• PCBN insert material for extended tool life on hardened steel, cast iron, and superalloys
• BN2000 manufacturer grade with uncoated surface for consistent edge geometry
• 80-degree diamond insert shape with negative rake for stable cutting forces
• 0.5-inch inscribed circle and 0.03125-inch corner radius conforming to CNMA series dimensions
• Clamp and pin holding method for secure, repeatable seating in compatible toolholders
• Compliant with ANSI and ISO 13399 standards for dimensional interoperability

Compatibility

Designed for use in CNMA-series toolholders accepting a 0.5-inch inscribed circle insert with clamp and pin retention. Conforms to ANSI code NUCNMA432 and ISO code NU-CNMA120408 for cross-reference with compatible toolholder systems.

Installation Notes

Insert installation and indexing should be performed by qualified machinists following the machine tool manufacturer and toolholder supplier guidelines. Power down and lock out the CNC turning center before seating or removing the insert. Use the correct clamp torque specified by the toolholder manufacturer — do not over-torque, as PCBN inserts are brittle and susceptible to edge chipping under mechanical shock. Inspect the toolholder seat and clamping hardware for wear or debris before installing a new insert.