Accupro B290900R Corner Radius Boring Bar Solid Carbide

Product Description

The ACCUPRO B290900R is a corner radius boring bar manufactured from submicron-grade solid carbide with a bright finish coating. It is designed for internal boring operations requiring a controlled corner radius at the base of the bore. The bar cuts right hand and accepts a 5/16-inch shank diameter, making it compatible with standard boring bar holders used on CNC lathes and manual turning centers. With a minimum bore diameter of 0.29 inches and a maximum bore depth of 0.9 inches, it is suited for small-diameter, moderate-depth internal features where finish quality and dimensional accuracy are critical.

This boring bar is used in precision machining environments including job shops, production turning cells, and tool rooms. It is appropriate for cutting ferrous and non-ferrous materials where a radiused corner is required at the bore floor. The corner radius range of 0.005 to 0.008 inches allows the machinist to achieve a blended transition that reduces stress concentration in the finished part. The 2.5-inch overall length provides adequate reach for typical small-bore applications while maintaining rigidity to minimize deflection and chatter.

Key Features

• Submicron solid carbide construction for extended tool life in demanding cuts
• Corner radius range of 0.005 to 0.008 inches for blended bore-floor transitions
• Right hand cutting direction for standard turning setups
• Bright finish coating with no added coating thickness affecting tolerances
• 5/16-inch shank diameter fits standard small-bore toolholders
• 0.9-inch maximum bore depth suitable for through and blind bore applications

Compatibility

Designed for use in standard 5/16-inch boring bar toolholders on CNC and manual lathes configured for right hand internal turning operations.

Installation Notes

Installation is performed by a machinist or toolroom technician. Secure the shank firmly in the toolholder to the full recommended clamp engagement depth before use. Ensure the machine spindle is fully stopped and locked before inserting or removing the boring bar. Verify minimum bore diameter clearance before entering the workpiece to avoid tool or workpiece damage.