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The MICRO 100 BB-230400X is a solid carbide boring bar designed for internal diameter machining on lathes and turning centers. It handles a minimum bore diameter of 0.23 inches and a maximum bore depth of 0.4 inches, making it suited for tight, shallow blind or through-bore operations. The bar features an AlTiN finish coating for improved heat resistance and tool life at elevated cutting speeds. With a 5/16-inch shank diameter and an overall length of 2.5 inches, it fits standard boring bar holders used in production and job-shop turning applications. Licensed machinists and CNC turning specialists are the primary installers of this tooling.
This boring bar is applied in CNC lathe and manual turning setups where small-diameter internal bores require precise finishing or roughing passes. The right-hand cutting direction suits standard spindle rotation on conventional turning equipment. The 0.006-inch corner radius provides a controlled blend between the bore wall and floor, supporting close-tolerance work in materials that respond well to carbide tooling with AlTiN coating, including hardened steels, stainless alloys, and high-temperature alloys.
Designed as an OEM-style replacement or standard tooling selection for CNC and manual turning centers accepting a 5/16-inch boring bar shank.
Installation is performed by qualified machinists or CNC setup technicians. The machine spindle must be fully stopped and the toolholder securely locked before inserting or removing the boring bar. Shank overhang should be minimized to reduce deflection and chatter in small-bore cuts. Refer to the machine tool manufacturer guidelines and applicable shop safety standards when setting tool offsets and cutting parameters.
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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