Sumitomo 16JRCWQ Pcbn Turning Insert BN2000 35-deg Diamond

Product Description

The SUMITOMO 16JRCWQ is a PCBN (polycrystalline cubic boron nitride) turning insert designed for machining hardened and hard-to-cut materials. It carries the BN2000 manufacturer grade, which is engineered for high wear resistance with moderate toughness, making it well-suited for interrupted and continuous cuts on hardened ferrous workpieces. The insert features a 35-degree diamond (rhombic) shape, a 3/8 inch inscribed circle, and a 1/64 inch corner radius. It is uncoated, with a bright finish and a negative rake and negative side clearance geometry. ANSI Insert Code is VNMA331; ISO Insert Code is VNMA160404.

This insert is used in turning applications on hardened steels, hardened cast irons, and other hard materials classified under ISO workpiece material group H. It is intended for use in precision CNC turning centers where tight tolerances and long tool life on hard materials are required. The VNMA insert style with clamp and pin holding method suits rigid toolholding setups common in production and job-shop environments targeting hardened workpiece finishing operations.

Key Features

• PCBN insert material provides high wear resistance for hardened workpiece machining
• BN2000 grade balances wear resistance with moderate toughness for both continuous and light interrupted cuts
• 35-degree diamond insert shape enables access in tight-clearance turning profiles
• Negative rake and negative side clearance geometry supports strong cutting edge retention
• Uncoated bright finish — no coating delamination risk on precision finishing passes
• Compatible with ANSI and ISO 13399 tooling standards for broad toolholder compatibility

Compatibility

Designed for use in VNMA-style toolholders accepting a 331 ANSI size code insert. Compatible with clamp and pin holding systems. Conforms to ANSI and ISO 13399 insert standards.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician. Power down and lock out the machine spindle before seating or removing the insert. Use the appropriate torque wrench for the clamp screw — refer to the toolholder manufacturer specifications for clamping torque. Inspect the insert seat and shim for debris or damage before installation to ensure proper seating and prevent edge chipping.