Micro 100 QTH-405 Boring Grooving Bar Holder

Product Description

The MICRO 100 QTH-405 is a boring and grooving bar holder designed for use with small-diameter boring bars in internal machining operations. It features a 1.0000-inch outside diameter, a 0.1875-inch (3/16 inch) inside diameter bore for bar retention, and an overall length of 2.8 inches. The head diameter measures 1.0620 inches. This holder is built to accept compatible boring and grooving bars and is part of the QTH series, which is engineered for rigid, precise bar clamping on CNC lathes and turning centers. Coolant-through capability supports chip evacuation and tool life in demanding internal turning applications. Machinists and CNC operators are the primary users of this tooling component.

The QTH-405 is suited for internal boring, grooving, and related turning operations on CNC lathes and turning centers in production and job shop environments. It accepts a 3/16-inch shank boring bar and is appropriate for applications requiring a compact 1-inch body diameter, making it well-suited for work in confined turret or block-style tool stations. The coolant-through feature makes it a practical choice for deep-bore applications or materials that generate significant heat during cutting.

Key Features

• 0.1875-inch (3/16 inch) inside diameter for compatible boring bar shanks
• 1.0000-inch outside diameter body for standard tooling station fitment
• 2.8-inch overall length for reach and rigidity in turning operations
• 1.0620-inch head diameter for positive seating and clamping
• Coolant-through design supports chip removal and extended tool life
• Part of the QTH series for consistent compatibility across the MICRO 100 boring bar holder lineup

Compatibility

Designed as an OEM-style holder for 3/16-inch shank boring and grooving bars within the MICRO 100 QTH series tooling system.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician with the machine powered down and the turret in a safe index position. Verify that the boring bar shank diameter matches the 0.1875-inch bore before seating. Ensure all clamping screws are torqued per the machine tool builder and toolholder manufacturer guidelines. Connect coolant-through lines only after confirming proper bar seating and holder registration in the turret block.