Iscar 6403837 Corner Radius Boring Bar Left Hand Carbide

Product Description

The ISCAR 6403837 is a left-hand cut corner radius boring bar designed for precision internal turning and boring operations on CNC and manual lathes. Manufactured from submicron solid carbide in ISCAR grade IC908 with a TiAlN and TiN finish coating, this bar delivers consistent tool life in hardened steels, stainless alloys, and other difficult-to-machine materials. The bar has a minimum bore diameter of 0.2677 inches, a maximum bore depth of 0.9449 inches, and a corner radius of 0.006 inches. Overall length is 1.5748 inches. At 0.037 pounds, it is a compact, rigid tooling solution suited for small-bore finishing and semi-finishing passes.

This boring bar is intended for small-bore internal machining applications where a left-hand cutting direction is required. Typical installations include CNC turning centers and manual lathes performing finish boring on bores starting at 0.2677 inches. The 20-degree bar end angle facilitates chip clearance in tight bore geometries. The IC908 grade is well suited to high-speed interrupted and continuous cuts in ferrous and non-ferrous materials. Machinists and CNC setup technicians working in precision parts, medical component, and aerospace manufacturing will find this bar applicable to close-tolerance bore finishing work.

Key Features

• Submicron solid carbide construction in ISCAR grade IC908 for extended tool life in demanding materials
• TiAlN and TiN finish coating improves wear resistance and heat dissipation at the cutting edge
• Left-hand cutting direction for specific toolholder and machine orientation requirements
• 0.006-inch corner radius supports tight tolerance blending at bore shoulders
• 20-degree bar end angle aids chip evacuation in small, deep bores
• Compact 1.5748-inch overall length minimizes overhang and deflection

Compatibility

Designed as an OEM-style replacement boring bar for use in standard small-bore internal turning applications requiring a left-hand, corner-radius geometry with a 7.00 mm shank diameter.

Installation Notes

Installation should be performed by a qualified machinist or CNC tooling technician. Ensure the machine spindle is fully stopped and the turret or toolholder is locked before inserting or removing the bar. Verify shank diameter and bore direction match the toolholder specification before clamping. Follow the toolholder manufacturer torque guidelines and confirm runout with a dial indicator before taking a cutting pass.