Hertel 7000025 Indexable Boring Bar 2.5 in Left Hand

Product Description

The HERTEL 7000025 is a left-hand A-MDUN indexable boring bar designed for internal diameter turning and boring operations on CNC lathes and machining centers. It accepts DN.. series inserts and features through-coolant capability via a 1/4-18 NPT coolant hole thread, supporting extended tool life and chip evacuation in deep-bore applications. The steel shank measures 2 inches in diameter with an overall length of 16 inches and a minimum bore diameter of 2.5 inches. The negative rake geometry at a 5-degree rake angle and a -3-degree lead angle suit it to interrupted cuts and hard materials. Licensed machinists and tooling technicians install and set this bar as part of a precision boring setup.

This boring bar is suited for production and job-shop environments where accurate internal diameters are required in medium-to-large workpieces. The left-hand orientation makes it appropriate for specific spindle rotation and toolholder mounting configurations on horizontal or vertical turning centers. The 1.375-inch center-to-cutting-edge and back-of-bar-to-cutting-edge dimension supports predictable tool offset entry into the control. Through-coolant delivery keeps the cutting zone clear during long-reach boring passes.

Key Features

• Left-hand A-MDUN toolholder style accepts DN.. series indexable inserts
• Through-coolant design with 1/4-18 NPT coolant port for active chip and heat management
• Negative rake geometry (5-degree rake angle, -3-degree lead angle) for stability in interrupted and hard-material cuts
• 2-inch steel shank diameter provides rigidity in deep-bore reach applications
• Insert secured by screw or clamp method for repeatable edge indexing
• 1/2-inch insert inscribed circle with 3/16-inch insert thickness for DN.. compatibility

Compatibility

Designed to accept DN.. series indexable inserts with a 1/2-inch inscribed circle and 3/16-inch thickness, as specified by the A-MDUN toolholder standard. Verify left-hand orientation and shank diameter against your turret or boring head mounting before ordering.

Installation Notes

This boring bar is installed by a qualified machinist or tooling technician. Before mounting, power down the machine and confirm spindle rotation direction matches the left-hand holder orientation. Torque insert clamping screws per the insert manufacturer specification using the appropriate torx or hex key. Connect the through-coolant supply to the 1/4-18 NPT port and verify flow before running the first pass.