Widia 4171871 CNMA643 Carbide Turning Insert Rhombic 80

Product Description

The WIDIA 4171871 is a CNMA643 series carbide turning insert designed for precision metal removal on CNC and manual lathes. It features a multilayer CVD coating - TiN, TiCN, and Al2O3 applied via MTCVD process - under the manufacturer grade WK20CT. The insert has a rhombic 80-degree shape (C shape code), a neutral hand orientation, and a honed cutting edge style with a flat top chip breaker. With 8 available cutting edges and a 0.0468-inch corner radius, it delivers consistent performance across roughing and finishing passes in ferrous machining applications.

This insert is primarily suited for cast iron (ISO material code K) and secondarily for steel (ISO material code P), making it a practical choice for job shops and production machining environments where a single insert grade must handle multiple workpiece materials. The neutral hand configuration allows use on both left- and right-hand toolholders. It is installed using a clamp or pin holding method, fitting standard CNMA-style toolholders. The ISO designation for this insert is CNMA190612.

Key Features

• Multilayer CVD coating (TiN, TiCN, Al2O3) via MTCVD process for wear and thermal resistance
• Rhombic 80-degree insert shape with 8 cutting edges for extended tool life per insert
• Flat top chip breaker with honed cutting edge for controlled chip formation
• Neutral hand orientation - compatible with both left- and right-hand toolholders
• Primary application in cast iron; secondary use in steel
• Meets ANSI and ISO standards; ISO code CNMA190612

Compatibility

Designed for use in CNMA-series toolholders that accept a 3/4-inch inscribed circle insert with clamp or pin holding. Compatible with standard ANSI and ISO CNMA190612 toolholder seats.

Installation Notes

Installation should be performed by a qualified machinist or tooling technician with the machine powered down and in a locked-out state. Seat the insert fully in the toolholder pocket and secure using the appropriate clamp or pin per the toolholder manufacturer's instructions. Inspect the seat and clamp for wear or debris before installing a fresh cutting edge. Verify insert orientation and hand before resuming machine operation.