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The MICRO 100 BB-140500G is a solid carbide boring bar designed for internal diameter machining operations on lathes and turning centers. It features a minimum bore diameter of 0.140 inches (9/64 inches) and a maximum bore depth of 0.500 inches (1/2 inches), making it well suited for small-bore finishing and semi-finishing work. The right-hand cutting direction follows standard turning convention. A 0.006-inch corner radius provides a controlled edge geometry for consistent surface finish. This tool is installed and used by machinists and toolroom technicians working in production and job-shop environments.
This boring bar is intended for small-diameter internal turning applications where tight tolerances and fine surface finishes are required. With a 3/16-inch shank diameter and 2-inch overall length, it fits standard boring bar holders and quick-change tooling systems used on manual and CNC lathes. Solid carbide construction makes it appropriate for harder workpiece materials and higher-speed cutting conditions compared to high-speed steel alternatives.
Designed as a direct-fit replacement or addition for standard boring bar holders accepting a 3/16-inch shank diameter on manual and CNC lathes.
Installation is performed by machinists and toolroom technicians. Secure the shank fully in the boring bar holder to the manufacturer-specified clamping depth, minimizing overhang to reduce chatter. Ensure the machine spindle is fully stopped and all power is removed before inserting or adjusting the tool. Follow applicable shop safety procedures and machine manufacturer guidelines when setting tool height and offsets.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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