Hertel H59869966 Indexable Boring Bar 5/8 in Shank

Product Description

The HERTEL H59869966 is a steel indexable boring bar designed for precision internal turning and boring operations on CNC lathes and manual turning centers. Built to the HBBQ toolholder style, it accepts TPC-style inserts secured by a screw-clamp holding method. The bar features a 5/8 inch shank diameter, a minimum bore diameter of 0.438 inches, and a maximum bore depth of 1.125 inches. Overall length is 4.25 inches. Coolant-through capability is included, supporting chip evacuation and tool life in interrupted or continuous cuts. This bar is installed and set up by machinists and toolroom technicians working to close bore tolerances.

This boring bar is suited for small-diameter internal bore work in production and job-shop environments. The right-hand cut orientation makes it compatible with standard left-to-right feed setups on conventional and CNC lathes. The HBBQ toolholder style and screw-clamped insert retention provide repeatable insert indexing, which is important in high-cycle production runs where insert changes must not shift the cutting edge position. Steel construction offers rigidity in short-overhang setups typical of this bore diameter range.

Key Features

• Minimum bore diameter of 0.438 inches with a maximum bore depth of 1.125 inches
• 5/8 inch shank diameter for secure tool post or turret mounting
• Right-hand cut orientation for standard lathe feed direction
• Screw-clamp insert holding method for precise, repeatable insert indexing
• Coolant-through design aids chip flushing and extends insert life
• Compatible with TPC-style indexable inserts

Compatibility

Designed for use with TPC-style indexable inserts. Toolholder style is HBBQ. Refer to the manufacturer insert compatibility chart to confirm correct insert geometry and grade for the workpiece material and cutting conditions.

Installation Notes

Installation is performed by qualified machinists or toolroom technicians. Before mounting or indexing inserts, de-energize the machine and engage the spindle lock per shop lockout/tagout procedures. Secure the shank firmly in the tool post or turret to the required clamping torque per machine manufacturer specifications. Verify bore centerline alignment before taking cuts, and confirm coolant-through lines are clear and properly connected if using the coolant-through feature.