Hertel 7000055 Indexable Boring Bar 1.76in Right Hand

Product Description

The HERTEL 7000055 is a right-hand A-MTFN indexable boring bar engineered for precision internal turning operations on CNC lathes and machining centers. It features a 1.76-inch minimum bore diameter and a 14-inch overall length, making it well suited for deep-bore applications where reach and rigidity are critical. The 1-1/2-inch shank diameter provides solid tool-post clamping and reduces chatter at depth. Through-coolant capability delivers cutting fluid directly to the insert tip, extending tool life and improving chip evacuation in demanding materials. This bar is installed and maintained by CNC machinists and toolroom technicians.

This boring bar is designed for shops performing internal diameter turning, facing, and profiling in steel, cast iron, and similar materials. The A-MTFN toolholder style accepts TN-series triangular inserts secured by screw or clamp, giving machinists flexibility in insert grade selection. The 0-degree lead angle and negative 5-degree rake angle promote controlled chip formation and stable cutting forces. A back-of-bar to cutting edge measurement of 0.89 inches and a center-to-cutting-edge measurement of 0.89 inches support accurate tool-offset setup at the machine control.

Key Features

• 1.76-inch minimum bore diameter supports a wide range of internal turning applications
• 14-inch overall length provides extended reach for deep-bore work
• 1-1/2-inch steel shank for rigid clamping and reduced vibration
• Through-coolant with 1/4-18 NPT coolant hole thread directs fluid to the cutting zone
• Accepts TN-series triangular inserts with 1/2-inch inscribed circle and 3/16-inch thickness via screw or clamp holding
• Negative rake geometry with 0-degree lead angle for predictable chip control in ferrous materials

Compatibility

Designed to accept TN-series triangular indexable inserts with a 1/2-inch inscribed circle. The manufacturer also references this bar under part number A24MTFNR/L4.

Installation Notes

This boring bar is installed by qualified CNC machinists or toolroom technicians. Before mounting or changing inserts, power down the machine and follow lockout/tagout procedures per OSHA and shop safety standards. Secure the shank fully in the tool-post or boring-bar holder to the specified clamping depth to prevent deflection. Connect the through-coolant supply line to the 1/4-18 NPT port and verify flow before running the first cut.