Micro 100 QBT-1801250 Solid Carbide Boring Bar 1/4 in Shank

Product Description

The MICRO 100 QBT-1801250 is a solid carbide boring bar designed for internal diameter machining in tight-bore applications. It accepts a minimum bore diameter of 0.1800 inches and reaches a maximum bore depth of 1.25 inches, making it well suited for small, deep-hole work where rigidity and precision matter. The right-hand cutting direction and 0.0060-inch corner radius support clean, controlled finishes on ferrous and non-ferrous materials. With a 0.25-inch shank diameter and an overall length of 2.5 inches, this bar mounts directly into standard boring heads and tool holders used in CNC and manual lathe setups. Machinists and toolroom operators working on close-tolerance bores will find this bar appropriate for production and prototype work alike.

This boring bar is intended for use in internal turning and boring operations on CNC lathes, turning centers, and manual engine lathes equipped with a compatible boring head or tool holder. It is a right-hand cut tool, meaning the cutter engages the workpiece with a conventional right-hand rotation and feed direction. Applications typically include bore finishing, diameter correction, and precision ID work in small-diameter holes where standard insert-style bars cannot reach or hold tolerance.

Key Features

• Solid carbide construction provides high rigidity and wear resistance in small-bore applications
• 0.1800-inch minimum bore diameter enables machining in very tight internal passages
• 1.25-inch maximum bore depth suits a wide range of through and blind hole configurations
• 0.0060-inch corner radius supports controlled surface finish on finished bore walls
• Right-hand cutting direction for standard lathe and turning center setups
• 1/4-inch shank diameter fits common boring head and tool holder systems

Compatibility

Designed as an OEM-style replacement or direct fitment boring bar for standard 1/4-inch shank boring heads and tool holders used in CNC and manual turning applications requiring a minimum bore diameter of 0.1800 inches.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and lock out the machine spindle before mounting or removing the bar. Secure the shank firmly in the tool holder to the appropriate clamping torque specified by the tool holder manufacturer. Verify bore depth clearance before engaging the cut to avoid interference between the bar body and the workpiece.