Iscar 6403799 Boring Bar Submicron Solid Carbide

Product Description

The ISCAR 6403799 is a solid carbide boring bar designed for precision internal turning and bore finishing operations. Built from submicron-grade carbide, it delivers consistent edge integrity at small bore diameters where tool deflection and wear resistance are critical. This bar handles a minimum bore diameter of 0.0790 inches and a maximum bore depth of 0.3540 inches, making it suited for tight, shallow bores that standard tooling cannot reach. The 4.00 mm shank diameter and 0.9449-inch overall length fit compact toolholding setups on CNC lathes and turn-mill centers. A 0.0020-inch corner radius supports fine surface finishes on close-tolerance features. Machinists and toolroom operators working in precision components, medical, aerospace, or instrument manufacturing will find this bar appropriate for those applications.

This boring bar is applied in internal diameter finishing and semi-finishing passes where bore geometry and surface finish tolerances are tight. The right-hand cutting direction suits conventional CNC lathe spindle rotation in standard boring cycles. Its small shank and short reach make it a practical choice for micro-bore work on small-diameter features in precision turned parts, hydraulic components, and instrumentation housings. It is intended for use by skilled machinists operating CNC turning equipment requiring submicron-grade tooling.

Key Features

• Submicron solid carbide construction for superior wear resistance and edge stability at small diameters
• Minimum bore diameter of 0.0790 inches enables access to tight internal features
• Maximum bore depth of 0.3540 inches suits shallow precision bore applications
• 4.00 mm shank diameter fits compact toolholding systems on CNC lathes and turn-mills
• 0.0020-inch corner radius supports fine surface finish requirements
• Right-hand cutting direction for standard CNC lathe boring operations

Compatibility

Designed as an OEM-style solid carbide boring bar for use in 4.00 mm shank toolholding systems on CNC turning centers and lathes configured for right-hand internal boring operations.

Installation Notes

Installation and tool changes should be performed by a qualified machinist with the machine in a full stop and lockout-tagout procedure applied per shop safety standards. Secure the shank fully within the toolholder to the recommended clamping depth to minimize overhang and deflection. Avoid side-loading the bar beyond its rated bore depth, as submicron carbide is rigid but brittle under off-axis forces. Verify bore diameter and depth parameters in the CNC program before first pass.