Kennametal 2408509 Indexable Boring Bar Left Hand

Product Description

The KENNAMETAL 2408509 is a left-hand indexable boring bar designed for precision internal turning and boring operations on CNC lathes and machining centers. Built on the Kenclamp series platform, this steel-bodied bar accepts CN.. style inserts held by a clamp method with a negative rake angle of 5 degrees, delivering stable cutting action on ferrous and non-ferrous materials. The 1.5-inch shank diameter and 14-inch overall length make it well suited for deep-bore applications where rigidity and reach are both required. A through-coolant port with a 1/4-18 NPT thread size directs coolant directly to the cutting zone, reducing heat buildup and extending insert life in demanding bore conditions.

This boring bar is used in production and job-shop environments where accurate internal diameter work is required. The 1.76-inch minimum bore diameter and 0.89-inch center-to-cutting-edge measurement define the entry and geometry requirements for the application. The -5 degree lead angle is suited for applications requiring controlled chip flow and consistent finish quality in through or blind bores. It is typically installed by machinists and CNC tooling technicians on turning centers equipped with appropriate shank-diameter toolholders. The Kenclamp insert holding system provides repeatable index positioning without the need for resetting offsets after each insert change.

Key Features

• Left-hand orientation for climb-cut and specific spindle-rotation boring setups
• Through-coolant capability via 1/4-18 NPT port for direct cutting-zone cooling
• Clamp-style insert holding (Kenclamp series) for rigid, repeatable insert indexing
• Negative rake geometry reduces cutting forces and supports harder workpiece materials
• 14-inch overall length with 1.5-inch shank for deep-reach boring applications
• Steel construction for durability and vibration damping in long-overhang setups

Compatibility

Designed to accept CN.. series indexable inserts with a 0.5-inch inscribed circle and 3/16-inch thickness, following A-DCLN-KC toolholder geometry standards.

Installation Notes

Installation and setup should be performed by a qualified machinist or CNC tooling technician. Secure the shank in a matched-diameter toolholder block and confirm axial and radial runout before engaging the cut. Power down and lock out the machine spindle before indexing or replacing inserts. Torque the clamp screw only to the insert manufacturer guidelines specified in the Kennametal tooling documentation supplied with the product.