Scientific Cutting Tools QHC75-5/32 Boring Grooving Bar Holder

Product Description

The SCIENTIFIC CUTTING TOOLS QHC75-5/32 is a boring and grooving bar holder designed to secure small-diameter boring bars in turning and machining applications. With a 5/32-inch inner diameter and a 3/4-inch outer diameter, this holder accommodates slender boring bars used for internal grooving and precision bore work. The 3-3/4-inch overall length and 0.87-inch head diameter provide a compact, rigid platform suited for CNC lathes and manual turning centers. Through-coolant capability supports chip evacuation and tool life at the cutting zone. Four lock-down screws provide secure bar clamping and repeatable positioning during high-precision passes.

This holder is intended for use in metalworking shops running internal grooving and boring operations on CNC or manual lathes. It belongs to the QHC series, which is designed for use with small-shank boring bars in tight-bore applications. The 3/8-18 NPT coolant connection makes it straightforward to integrate into machines with through-coolant capability, delivering cutting fluid directly to the tool tip. Machinists and toolroom technicians working on precision internal features will find this holder appropriate for production and job-shop environments alike.

Key Features

• 5/32-inch bore ID accommodates small-diameter boring bars for internal grooving work
• 3/4-inch OD shank fits standard tooling blocks and turrets
• Through-coolant design with 3/8-18 NPT connection for direct coolant delivery to the cutting edge
• Four lock-down screws provide firm, repeatable bar clamping
• 0.87-inch head diameter and compact 3-1/4-inch overall length suit confined machining envelopes

Compatibility

Designed as an OEM-style replacement and standard tooling component for lathes and turning centers accepting 3/4-inch OD boring bar holders within the SCIENTIFIC CUTTING TOOLS QHC series.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Before mounting or removing the holder, de-energize and lock out the machine per facility lockout/tagout procedures. Torque the four lock-down screws evenly to secure the boring bar without deflection. Connect the through-coolant line to the 3/8-18 NPT port using appropriate fittings and verify there are no leaks before resuming cutting operations.