Micro 100 QTH-406 Boring Grooving Bar Holder

Product Description

The MICRO 100 QTH-406 is a boring and grooving bar holder designed to secure small-diameter boring and grooving bars in CNC lathes and turning centers. Part of the QTH series, this holder accepts bars with a 0.25-inch inside diameter and mounts into a 1-inch outside diameter bore. The head diameter measures 1.062 inches and the overall length is 2.8 inches. A coolant-through design routes cutting fluid directly to the tool tip, supporting chip evacuation and tool life during internal grooving and boring operations. Machinists and toolroom professionals install this holder in production and job-shop turning applications.

The QTH-406 is suited for internal grooving, boring, and profiling operations on CNC lathes and live-tool turning centers. The coolant-through feature makes it well-matched for deep-bore and difficult-to-reach internal features where flood coolant alone is insufficient. It is appropriate for both production runs and prototype work where tool rigidity and repeatability at small diameters are required.

Key Features

• Coolant-through construction routes fluid directly to the cutting edge for improved chip clearing
• 0.25-inch inside diameter accepts standard QTH-series boring and grooving bars
• 1-inch outside diameter fits standard lathe turret pockets and tool blocks
• 1.062-inch head diameter provides additional clamping surface area
• 2.8-inch overall length suits typical CNC lathe tooling envelopes
• Part of the MICRO 100 QTH series for consistent cross-compatibility within the product family

Compatibility

Designed for use with MICRO 100 QTH-series boring and grooving bars with a 0.25-inch shank diameter; consult the QTH series catalog to confirm bar and holder pairing for specific grooving widths and depths.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and lock out the machine before mounting or removing tooling from the turret. Ensure the turret pocket bore and holder outside diameter are clean and free of chips before seating the holder. Verify coolant-through passages are clear and properly connected to the machine coolant supply before running the spindle.