Iscar 6403657 Corner Radius Boring Bar Solid Carbide

Product Description

The ISCAR 6403657 is a solid carbide corner radius boring bar designed for precision internal turning and boring operations on CNC and manual lathes. With a minimum bore diameter of 0.1969 inches (5.00 mm) and a maximum bore depth of 0.748 inches, this bar handles small-diameter internal work where rigidity and accuracy are critical. The 0.0079-inch corner radius promotes controlled chip formation and a consistent surface finish at the bore wall. A TiCN and TiN finish coating in manufacturer grade IC228 provides wear resistance and extended tool life in ferrous and non-ferrous materials. Licensed machinists and CNC operators working in precision shops are the primary users.

This boring bar suits small-bore internal turning applications in production and job-shop environments, including finish boring of hydraulic components, valve bodies, bushings, and similar tight-tolerance workpieces. The right-hand cutting direction is standard for conventional lathe rotation. The 5.00 mm shank diameter fits toolholders and boring bar holders sized for that shank, making it compatible with modular and static tooling systems commonly found on Swiss-type, turret, and gang-tool lathes handling small-diameter work.

Key Features

• Solid carbide construction provides high rigidity in small-diameter, deep-reach boring applications
• TiCN and TiN dual coating in IC228 grade extends cutting edge life and reduces built-up edge
• 0.0079-inch corner radius supports controlled surface finish and reduces stress concentration at bore corners
• Right-hand cutting direction compatible with standard lathe rotation
• Compact 1.378-inch overall length suits tight tooling envelopes on small CNC platforms

Compatibility

Designed for use in boring bar holders and tooling systems that accept a 5.00 mm shank diameter. Intended for right-hand internal turning on CNC and manual lathes performing small-bore operations.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Secure the shank in a properly sized boring bar holder, ensuring full contact along the shank to minimize overhang deflection. Power down and lock out the machine spindle before mounting or removing the tool. Follow the toolholder manufacturer's clamping torque specifications and verify runout with a dial indicator before taking the first cut.