Kennametal 1271040 Indexable Boring Bar Right Hand

Product Description

The KENNAMETAL 1271040 is an indexable boring bar designed for internal turning and bore finishing operations in precision machining environments. Built with a solid carbide shank and a steel head, this bar delivers rigidity and vibration damping needed for tight-tolerance boring. It carries a minimum bore diameter of 0.208 inches and an overall length of 6 inches. The screw-type insert holding method secures CDC inserts firmly during cutting, and the right-hand cut orientation suits standard lathe setups. Coolant-through capability supports chip evacuation and tool life in deep-bore applications.

This boring bar is suited for CNC lathe and turning center applications where small-diameter internal bores require precise, repeatable cutting geometry. The 5-degree lead angle and positive rake geometry reduce cutting forces and improve surface finish on ferrous and non-ferrous workpieces. It is typically specified by machining shops, toolroom technicians, and production CNC operators working with bores in the 0.208-inch to roughly 1.875-inch depth range.

Key Features

• Solid carbide shank with steel head for rigidity and vibration resistance
• Minimum bore diameter of 0.208 inches with maximum bore depth of 1.875 inches
• Coolant-through design with a 0.04-inch coolant hole for chip flushing and thermal control
• Screw-type insert clamp compatible with CDC inserts (0.156-inch inscribed circle, 0.04-inch thickness)
• Positive rake angle of 5 degrees reduces cutting forces and promotes clean chip formation
• Right-hand cut, Series C toolholder style (CCBI) for standard lathe orientation

Compatibility

Designed to accept CDC series indexable inserts with a 0.156-inch inscribed circle and 0.04-inch insert thickness. Toolholder style is CCBI. Verify insert grade and geometry selection based on workpiece material before use.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician familiar with indexable boring bar setups. Ensure the machine spindle is fully stopped and all power is isolated before changing inserts or setting tool offsets. Secure the shank in the toolholder at the correct overhang length to minimize deflection; excessive overhang beyond recommended bore depth can result in chatter or dimensional inaccuracy. Follow the insert manufacturer torque specifications for the clamping screw when seating CDC inserts.