Kennametal 1289024 Indexable Boring Bar 0.208 in Rh Steel

Product Description

The KENNAMETAL 1289024 is a right-hand indexable boring bar designed for precision internal turning operations on CNC lathes and manual turning centers. Built on the CSBI toolholder style with a 3/16-inch shank diameter and 2.5-inch overall length, this bar handles minimum bore diameters starting at 0.208 inches and a maximum bore depth of 0.75 inches. The screw-clamping insert retention method secures CDC-style inserts firmly during cutting, and the positive 5-degree rake angle promotes clean chip evacuation in tight bore profiles. A coolant-through design with a 0.04-inch coolant hole supports thermal control and chip flushing in deep-bore applications. Machining professionals and tool-crib technicians working in precision shops specify this bar for small-bore finishing work.

This boring bar is suited for small-diameter internal turning in both production and job-shop environments. Its compact shank and short overall length make it appropriate for tight clearance setups on Swiss-style machines, CNC lathes, and turret-style turning centers where bore access is restricted. The coolant-through channel makes it particularly useful in applications where chip packing is a concern in blind or semi-blind bores. Machinists working with ferrous and non-ferrous workpiece materials will find the positive rake geometry effective for light to medium cuts in small-bore profiles.

Key Features

• Minimum bore diameter of 0.208 inches for small-bore internal turning
• 3/16-inch shank diameter with 2.5-inch overall length for compact setups
• Screw-clamping retention for CDC inserts with positive 5-degree rake angle
• Coolant-through design via 0.04-inch coolant hole for chip and heat control
• Maximum bore depth of 0.75 inches
• Right-hand cut orientation; Series C toolholder family

Compatibility

Designed for use with CDC-style indexable inserts with a 0.156-inch inscribed circle and 0.04-inch insert thickness. This bar is part of the Series C CSBI toolholder style lineup and accepts standard screw-clamped CDC inserts.

Installation Notes

This boring bar should be installed by a qualified machinist or toolroom technician following the machine tool builder's setup procedures. Power down and lock out the spindle before inserting or changing the bar or indexable insert. Confirm shank-to-turret or tool-block fit before torquing the clamping screw to the insert manufacturer's specification. Verify coolant-through passages are clear and aligned with the machine's coolant supply before initiating a cut.