Kennametal 1152689 Indexable Boring Bar Left Hand Solid Carbide

Product Description

The KENNAMETAL 1152689 is a solid carbide indexable boring bar designed for internal turning and boring operations on CNC lathes and machining centers. Part of the Top Notch series, it accepts N-style inserts held by a clamp-style insert holding method. The bar features a left-hand cut orientation, a 0.5-inch shank diameter, and an overall length of 8 inches. A built-in coolant-through capability with a 0.19-inch coolant hole diameter supports chip evacuation and tool life in demanding cutting conditions. Licensed machinists and CNC operators use this bar for precision bore finishing and roughing in tight-tolerance applications.

This boring bar is suited for shops running internal diameter operations where a minimum bore diameter of 0.73 inches is required. The E-NE toolholder style and 3-degree lead angle make it appropriate for general-purpose boring on ferrous and non-ferrous materials. The center-to-cutting-edge dimension of 0.437 inches provides the clearance geometry needed for consistent insert positioning. It is used in production machining environments as well as job shops handling repair and custom work.

Key Features

• Solid carbide construction for rigidity and vibration resistance in small-bore applications
• Coolant-through design with 0.19-inch coolant hole diameter for improved chip control and tool life
• Left-hand cut orientation for specific machine setups and reverse-rotation operations
• Clamp-style insert holding method for secure N-style insert retention
• Top Notch series toolholder style E-NE with 3-degree lead angle
• Center-to-cutting-edge dimension of 0.437 inches for precise insert positioning

Compatibility

Compatible with N-style indexable inserts as specified by the Top Notch series toolholder system. Designed for use in standard CNC lathe and boring applications requiring a minimum bore diameter of 0.73 inches and a 0.5-inch shank.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully stopped and all power is locked out before mounting or changing the boring bar or insert. Secure the shank in a properly sized tool block or turret pocket to the machine manufacturer torque specifications. Verify insert seating and clamp engagement before initiating a cutting cycle.