Hertel H59868992 Indexable Boring Bar 0.275 in Min Bore

Product Description

The HERTEL H59868992 is a steel indexable boring bar designed for precision internal turning and boring operations on CNC lathes and manual turning centers. Built to the HBBF toolholder style, it accepts TD-style inserts secured by screw clamping for repeatable, rigid insert positioning. The minimum bore diameter is 0.275 inches with a maximum bore depth of 0.750 inches. The shank measures 3/16 inch in diameter and the tool has an overall length of 3.5 inches. Coolant-through capability supports chip evacuation and tool life in ferrous and non-ferrous bore applications. This tool is intended for use by machinists and tool-and-die professionals working in production or job-shop environments.

This boring bar is suited for small-diameter internal bore operations where clearance and reach are critical. The right-hand cut orientation makes it compatible with standard forward-turning setups on most lathes and turning centers. Its compact shank diameter and short overall length make it appropriate for tight-bore applications in components such as bushings, housings, and small hydraulic or pneumatic bodies. Machinists running TD-compatible insert programs will find this holder integrates directly into existing tooling systems without requiring additional adapters.

Key Features

• HBBF toolholder style with screw-lock insert clamping for secure, repeatable TD-style insert seating
• Minimum bore diameter of 0.275 inches supports small-diameter internal turning
• Maximum bore depth of 0.750 inches
• Coolant-through design aids chip removal and extends insert life
• Right-hand cut orientation for standard forward-turning lathe setups
• Steel construction provides rigidity in light to medium bore applications

Compatibility

Accepts TD-style indexable inserts. Designed as an OEM-style replacement or direct addition to tooling setups using HBBF-series boring bars with TD insert compatibility.

Installation Notes

Installation is performed by qualified machinists. Ensure the machine spindle is fully stopped and the lathe is locked out before changing or seating inserts or mounting the boring bar. Use the correct torque driver for the screw-lock insert clamp to avoid insert movement or seat damage. Confirm shank-to-holder fit and bore clearance before initiating a cut.