Kennametal 2408389 Indexable Boring Bar Right Hand

Product Description

The KENNAMETAL 2408389 is a right-hand indexable boring bar designed for internal turning and boring operations on CNC lathes and machining centers. Built on the Kenclamp series platform, it accepts DN.. style inserts held by a clamp method with a negative rake angle of 5 degrees. The shank diameter is 1 inch with an overall length of 12 inches, and the minimum bore diameter is 1.3 inches. A through-coolant design routes fluid directly to the cutting zone via a 1/4-18 NPT coolant hole, supporting extended tool life and chip evacuation in deep bore applications. The bar body is constructed from steel and is installed by machinists and toolroom professionals.

This boring bar is suited for precision internal diameter work in both production and job-shop environments. The -5 degree lead angle and 1.3-inch minimum bore capacity make it appropriate for medium-bore finishing and semi-finishing passes. The center-to-cutting-edge dimension of 0.75 inches supports predictable tool offset setup. Compatible insert inscribed circle size is 3/8 inch with an insert thickness of 3/16 inch, keeping tooling standardization straightforward for shops already running DN.. geometry inserts.

Key Features

• Through-coolant design with 1/4-18 NPT inlet for directed cutting-zone fluid delivery
• Clamp-style insert holding with negative rake for rigidity on interrupted and continuous cuts
• 1.3-inch minimum bore diameter and 12-inch overall length for medium-depth internal operations
• Steel shank construction provides damping and durability in standard bore applications
• Accepts DN.. inserts with 3/8-inch inscribed circle and 3/16-inch thickness
• Right-hand orientation for standard OD-to-ID cutting direction on conventional setups

Compatibility

Designed for use with DN.. style indexable inserts in the A-DDUN-KC holder configuration, Kenclamp series. Insert inscribed circle is 3/8 inch; insert thickness is 3/16 inch. No additional specific machine model compatibility was provided in the product data.

Installation Notes

Installation is performed by a qualified machinist or toolroom technician. The machine spindle and coolant supply must be fully de-energized and locked out before mounting or removing the boring bar. Secure the shank in a properly sized boring bar holder or turret station to the machine manufacturer's recommended clamping torque. Verify insert seating and clamp screw engagement before returning the machine to service.