Scientific Cutting Tools BB185 Radial Relief Boring Bar

Product Description

The SCIENTIFIC CUTTING TOOLS BB185 is a radial relief boring bar ground from submicron-grade solid carbide for small-diameter internal turning and boring operations. With a minimum bore diameter of 0.185 inches and a maximum bore depth of 0.625 inches, it is engineered for precision work in tight bores where standard tooling cannot reach. The 3/16-inch shank diameter and 2-inch overall length keep the setup compact and rigid. The right-hand cutting direction and uncoated carbide surface suit applications where sharp edges and close tolerances are the priority. Machinists and tool-and-die professionals rely on this geometry for finishing bores in hardened or difficult-to-machine materials.

This boring bar is suited for use on CNC lathes, manual engine lathes, and boring mills where small internal diameters must be held to tight tolerances. Typical applications include finishing bores in dies, molds, bushings, and precision mechanical components. The radial relief geometry reduces tool pressure and improves chip clearance in shallow, small-diameter bores. It is appropriate for both production and jobbing environments where consistent bore geometry is required across runs of precision parts.

Key Features

• Submicron-grade solid carbide construction for rigidity and wear resistance in small-bore applications
• Minimum bore diameter of 0.185 inches for access to tight internal features
• Maximum bore depth of 0.625 inches suits shallow-bore finishing operations
• Radial relief geometry reduces cutting forces and improves chip evacuation
• Right-hand cutting direction for standard lathe and boring mill setups
• Uncoated finish maintains sharp cutting edge geometry for precision finishing cuts

Compatibility

Designed as an OEM-style replacement and standard tooling solution for lathes and boring mills accepting a 3/16-inch round shank boring bar.

Installation Notes

Installation is performed by qualified machinists or toolroom personnel. Secure the 3/16-inch shank in a compatible boring bar holder or tool block and ensure the cutting edge is on center height before taking a cut. Power down and lock out the machine spindle before loading or adjusting the bar. Avoid overhang beyond the rated maximum bore depth to prevent deflection and chatter.