Micro 100 QTH-206 Boring Grooving Bar Holder

Product Description

The MICRO 100 QTH-206 is a boring and grooving bar holder designed for precision machining applications. Part of the QTH series, this holder accepts a 0.25 inch (1/4 inch) boring or grooving bar and measures 0.75 inches in outside diameter with an overall length of 2.8 inches. The head diameter is 0.875 inches. It features coolant-through capability, allowing cutting fluid to be delivered directly to the cutting zone for improved chip evacuation and tool life. This holder is typically installed by machinists and toolroom professionals on CNC lathes and boring machines.

The QTH-206 is suited for internal boring and grooving operations on CNC turning centers and manual lathes where a 1/4 inch bar shank is required. The coolant-through design makes it a practical choice for deep-bore applications or harder materials where heat management at the cutting edge is critical. Its compact outside diameter of 0.75 inches allows access to smaller workpiece bores without interference.

Key Features

• Coolant-through design delivers cutting fluid directly to the cutting zone
• 0.25 inch (1/4 inch) inside diameter accepts standard QTH-series boring and grooving bars
• 0.75 inch outside diameter for clearance in tight-bore applications
• 0.875 inch head diameter for secure tool retention
• 2.8 inch overall length provides reach for internal machining operations
• Part of the MICRO 100 QTH series for consistent tooling compatibility

Compatibility

Designed for use with MICRO 100 QTH-series boring and grooving bars with a 0.25 inch shank diameter. Fits CNC turning centers and manual lathes equipped with coolant-through tooling systems.

Installation Notes

Installation is performed by a qualified machinist or toolroom technician. Ensure the machine spindle is fully stopped and the coolant system is depressurized before mounting or removing the holder. Verify that the coolant-through passages are clear and that the bar shank seats fully and squarely in the holder bore before tightening. Follow the machine tool manufacturer's torque and clamping specifications for tool holders.