Hertel 7000021 Indexable Boring Bar 1.705 in Right Hand

Product Description

The HERTEL 7000021 is a right-hand A-MDUN indexable boring bar engineered for precision internal turning operations on CNC lathes and boring mills. Built from steel with a 1-1/4 inch shank diameter and a 14 inch overall length, it accepts DN-style inserts held by screw or clamp, with a negative rake angle of 5 degrees and a -3 degree lead angle. The minimum bore diameter is 1.705 inches, making it suitable for medium-to-large bore work. Through-coolant capability is integrated via a 1/4-18 NPT coolant hole, keeping the cutting zone clear and extending insert life in demanding cuts.

This boring bar is used in production and job-shop environments where accurate, repeatable bore finishing or roughing is required. It is suited for ferrous and non-ferrous materials where a negative-rake DN insert geometry is appropriate. The right-hand configuration positions the cutting edge for standard forward-feed boring operations on conventional lathe setups. Machinists and toolroom technicians installing this bar into CNC or manual boring setups will find the 1 inch back-of-bar to cutting edge and 1 inch center-to-cutting-edge dimensions useful for tool offset programming.

Key Features

• Right-hand A-MDUN toolholder style accepts DN-style indexable inserts
• 1.705 inch minimum bore diameter for medium-to-large bore applications
• 14 inch overall length with 1-1/4 inch steel shank for rigid setup
• Through-coolant design with 1/4-18 NPT port for directed coolant delivery
• Negative rake geometry with 5 degree rake angle and -3 degree lead angle
• Screw or clamp insert holding method for secure, repeatable insert indexing

Compatibility

Designed to accept DN-style indexable inserts with a 1/2 inch inscribed circle and 3/16 inch insert thickness, consistent with A-MDUN toolholder specifications.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the machine spindle is fully stopped and all motion is locked out before mounting or adjusting the boring bar. Verify shank-to-turret or boring head fit and torque retention hardware per the machine tool manufacturer specifications. Confirm coolant line connections at the 1/4-18 NPT port are properly sealed before resuming coolant flow.