Kennametal 3331084 Indexable Boring Bar Left Hand 0.73in

Product Description

The KENNAMETAL 3331084 is a left-hand indexable boring bar designed for precision internal turning operations in metal cutting applications. Built on the Top Notch series platform, this boring bar features a heavy metal shank construction that provides superior vibration damping compared to standard steel shanks, making it well suited for deep bore and long overhang conditions. The bar accepts N.2R inserts secured by a clamp-style holding method, and it includes a coolant-through channel measuring 0.156 inches in diameter for direct cutting-zone coolant delivery. At 8 inches overall length with a 0.5-inch shank diameter, it covers a minimum bore diameter of 0.73 inches.

This boring bar is intended for use in CNC lathes and manual turning centers where left-hand cutting geometry is required. It suits production and job-shop environments handling ferrous and non-ferrous bores that demand tight tolerances and good surface finish. The coolant-through capability makes it a practical choice for deep bore applications where conventional flood coolant has difficulty reaching the cutting zone. Machinists and toolroom technicians working with small-diameter internal features will find the 0.73-inch minimum bore capacity appropriate for a wide range of workpiece sizes.

Key Features

• Left-hand cutting geometry for specific lathe setups and reverse-rotation applications
• Heavy metal shank construction reduces vibration and chatter in long overhang conditions
• Coolant-through design with 0.156-inch coolant hole delivers cutting fluid directly to the insert
• Clamp-style insert retention provides secure, repeatable insert indexing
• Compatible with N.2R inserts in the Top Notch series tooling system
• Center to cutting edge of 0.432 inches for precise boring geometry

Compatibility

Designed for use with N.2R series inserts in the KENNAMETAL Top Notch indexable boring system. Toolholder style is L-RNE.

Installation Notes

This boring bar is installed and serviced by machinists and toolroom technicians on CNC or manual turning equipment. Power down and lock out the machine spindle before changing inserts or adjusting the toolholder. Ensure the shank is clamped securely in the turret or tool block to the full recommended engagement depth to maximize rigidity and minimize deflection. Connect the coolant-through supply line according to the machine tool manufacturer guidelines before operation.