Micro 100 QTH-206L Boring Grooving Bar Holder

Product Description

The MICRO 100 QTH-206L is a boring and grooving bar holder designed to secure small-diameter boring and grooving bars in CNC turning and machining centers. Built to QTH series standards, it accepts a 0.25 inch inside diameter bar shank and features a 0.75 inch outside diameter body with an overall length of 5.8 inches. The head diameter measures 0.875 inches. A coolant-through design channels cutting fluid directly to the tool tip, improving chip evacuation and extending tool life during internal grooving and boring operations. Machinists and CNC operators install this holder as part of a modular quick-change tooling system.

The QTH-206L is suited for internal boring and grooving applications on CNC lathes and turning centers where repeatability and rigid tool holding are required. The coolant-through feature makes it well matched for deep-bore operations or materials that generate significant heat at the cutting edge. It is intended for use with compatible QTH series boring and grooving bars of the appropriate shank diameter. The holder weighs 0.506 pounds, keeping spindle load minimal on smaller machines.

Key Features

• Accepts 0.25 inch inside diameter boring and grooving bar shanks
• 0.75 inch outside diameter body for compact toolpost or turret mounting
• Overall length of 5.8 inches for reach into workpiece bores
• Head diameter of 0.875 inches
• Coolant-through design for direct cutting fluid delivery to the tool tip
• Part of the QTH series modular quick-change tooling system

Compatibility

Designed for use with MICRO 100 QTH series boring and grooving bars with a 0.25 inch shank diameter. Consult the QTH series compatibility chart to confirm fit with specific bar models and machine toolpost configurations.

Installation Notes

Installation should be performed by a qualified machinist familiar with CNC turning center tooling systems. Power down and lock out the machine before seating or removing the holder from the turret or toolpost. Verify that the machine coolant system is compatible with the through-coolant passage before connecting fluid lines. Follow the machine manufacturer torque and clamping guidelines for the toolpost or turret interface.