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The MICRO 100 QBB-2301000X is a solid carbide boring bar designed for precision internal boring operations on CNC lathes and manual turning centers. It features a 0.230-inch minimum bore diameter and a maximum bore depth of 1 inch, making it suitable for tight-tolerance small-bore work. The 5/16-inch shank diameter and 2.5-inch overall length provide a compact, rigid setup that minimizes deflection during cutting. A 0.0050-inch corner radius delivers a controlled surface finish on finished bores. Right-hand cutting orientation is standard. Machinists and toolroom technicians specify this bar for production and prototype work where bore geometry and finish quality are critical.
This boring bar is used in precision machining environments including job shops, toolrooms, and production turning cells. It is well suited for small-bore applications in ferrous and non-ferrous materials where solid carbide rigidity is required to hold tight diameter and roundness tolerances. The right-hand cutting direction is compatible with conventional lathe spindle rotation. Applications include finishing bores in hydraulic components, fittings, and mechanical assemblies where access is limited by bore size.
Designed as an OEM-style replacement and standard toolroom boring bar compatible with 5/16-inch boring bar holders and cartridges used on CNC and manual lathes configured for right-hand turning operations.
Installation is performed by qualified machinists or toolroom technicians. Secure the shank firmly in a compatible boring bar holder, ensuring adequate clamping contact along the shank without overhanging beyond recommended guidelines for the bore depth. Power down and lock out the machine spindle before changing or adjusting tooling. Verify bore diameter and depth settings with gauging before committing to finish cuts.
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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