Kennametal 1288869 Indexable Boring Bar 0.292 in Min Bore

Product Description

The KENNAMETAL 1288869 is a steel indexable boring bar designed for precision internal turning and boring operations on CNC lathes and manual turning centers. It carries the manufacturer catalog designation A04FSCFDR12 and accepts CDC-style inserts secured by a screw clamping method. The bar features a right-hand cut orientation, a 5-degree lead angle, and a positive rake geometry that reduces cutting forces and improves chip flow in tight-bore applications. With a minimum bore diameter of 0.292 inches and a 0.25-inch shank diameter, this bar is suited for small-bore finish and semi-finish work where dimensional control is critical. Coolant-through capability supports chip evacuation and tool life in interrupted or deep-bore conditions.

This boring bar is used in production and job-shop environments where small-diameter internal features require consistent repeatability. The CSBI toolholder style and Series C designation make it a standard catalog selection for machinists working with small-bore components in steel, cast iron, aluminum, and similar workpiece materials. It is appropriate for both CNC and manual lathe applications where a 0.25-inch shank fits the tool block or boring bar holder. Licensed machinists and CNC operators are the primary users. The overall length of 3 inches allows adequate reach while maintaining rigidity in short-to-medium bore depth applications up to 0.75 inches deep.

Key Features

• Minimum bore diameter of 0.292 inches enables access to small internal features
• Screw-clamp insert holding method provides secure, repeatable CDC insert seating
• Coolant-through design with 0.04-inch coolant hole diameter aids chip removal and extends insert life
• Positive rake angle (5 degrees) reduces cutting forces for improved finish in small bores
• Right-hand cut orientation suits standard lathe and CNC turning setups
• Steel construction balances rigidity and vibration damping for finish boring passes

Compatibility

Designed for use with CDC-style indexable inserts with a 0.156-inch inscribed circle and 0.04-inch insert thickness. Compatible with any tool block or boring bar holder accepting a 0.25-inch round shank. Specific CDC insert grades and geometries should be selected based on workpiece material and cutting parameters.

Installation Notes

Installation and setup should be performed by a qualified machinist following the machine tool manufacturer guidelines and applicable shop safety procedures. Ensure the machine spindle is fully stopped and the lathe is in a locked or e-stop state before changing inserts or setting tool offsets. Secure the 0.25-inch shank firmly in the tool holder with appropriate clamping torque per the holder manufacturer specification. Verify bore diameter and depth clearance before initiating a cut, particularly when working near the minimum bore diameter of 0.292 inches.