Scientific Cutting Tools QHC75-1/8 Boring Grooving Bar Holder

Product Description

The SCIENTIFIC CUTTING TOOLS QHC75-1/8 is a boring grooving bar holder engineered for precision internal grooving and boring operations on CNC lathes and turning centers. It features a 1/8 inch inner diameter bore and a 3/4 inch outer diameter body, with an overall length of 3.25 inches and a head diameter of 0.87 inches. The holder includes through-coolant capability via a 3/8-18 NPT coolant port, directing fluid directly to the cutting zone to extend tool life and improve chip evacuation. Machinists and toolroom technicians install this holder when setting up grooving operations that require rigid, repeatable tool positioning in tight-bore applications.

The QHC75-1/8 is suited for use on CNC turning centers and manual lathes where internal grooving, profiling, or boring operations are performed. The Series QHC design is intended for shops running production or job-shop work that demands consistent tool alignment and secure lockdown. Through-coolant compatibility makes it a practical choice for applications involving difficult-to-machine materials or deep-reach grooving scenarios where heat buildup is a concern.

Key Features

• 1/8 inch ID bore and 3/4 inch OD body for compact, rigid tool holding
• 3.25 inch overall length provides reach for internal grooving applications
• 0.87 inch head diameter suits tight-bore entry requirements
• Through-coolant design with 3/8-18 NPT port for directed coolant delivery
• Four lock-down screws provide secure, vibration-resistant grooving bar retention
• Part of the Series QHC holder family for standardized tooling setups

Compatibility

Designed as an OEM-style replacement and standard tooling component for CNC lathes and turning centers accepting Series QHC boring grooving bar holders with a 3/4 inch OD shank interface.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Power down and lock out the machine spindle before mounting or adjusting the holder. Torque the four lock-down screws evenly in a cross pattern to ensure uniform bar clamping without distortion. Verify coolant line compatibility with the 3/8-18 NPT port before connecting through-coolant supply, and confirm holder alignment with a dial indicator before running the first cut.