Accupro ACC-50-3/16 Boring Grooving Bar Holder

Product Description

The ACCUPRO ACC-50-3/16 is a boring and grooving bar holder designed for use with indexable boring bars and grooving tools in metal-cutting operations. It features a 3/16 inch inner diameter (ID) bore and a 1/2 inch outer diameter (OD) body, with an overall length (OAL) of 2-3/4 inches and a head diameter of 0.63 inches. Belonging to the Series DH family, this holder provides rigid, repeatable clamping for precision internal boring and grooving work on lathes and turning centers. Two lock-down screws secure the cutting bar and resist movement under cutting loads, maintaining tool position throughout the operation.

This holder is suited for machine shops, tool rooms, and production turning applications where small-diameter internal boring and grooving are required. It is compatible with boring bars and grooving inserts matching the 3/16 inch shank diameter. Machinists and CNC lathe operators working on small-bore internal features will find this holder fits into standard tool posts and turrets sized for 1/2 inch OD shanks.

Key Features

• 3/16 inch ID bore accepts matching boring and grooving bar shanks
• 1/2 inch OD body for standard tool post and turret fitment
• 2-3/4 inch overall length for reach into small bores
• 0.63 inch head diameter for clearance in confined internal operations
• Two lock-down screws provide secure, rigid bar clamping
• Series DH designation for compatibility with corresponding DH-series boring bars

Compatibility

Designed as an OEM-style replacement and standard holder for Series DH boring and grooving bars with a 3/16 inch shank diameter used in lathe and turning center applications.

Installation Notes

Installation is typically performed by qualified machinists or CNC setup technicians. Power down and lock out the machine spindle before seating or removing the boring bar from the holder. Tighten both lock-down screws evenly to secure the bar and prevent axial or rotational movement during cutting. Follow the machine tool manufacturer's recommendations for tool post torque and overhang limits to minimize vibration and chatter.