Kennametal 1094838 Indexable Boring Bar Left Hand Steel

Product Description

The KENNAMETAL 1094838 is a left-hand indexable boring bar designed for precision internal turning operations on CNC lathes and boring mills. Built on the Top Notch series platform, it accepts N-style clamp-held inserts and features a coolant-through design with a 1/4-18 NPT coolant hole thread for direct chip and heat management at the cutting zone. The steel shank measures 1-1/4 inches in diameter with a 14-inch overall length, and the minimum bore diameter is 1-3/4 inches. This bar is suited for machinists and toolroom professionals running tight-tolerance bores on ferrous and non-ferrous workpieces.

This boring bar fits production and job-shop environments where left-hand cutting geometry is required, such as back-boring operations or setups where the spindle direction or workholding orientation demands a left-hand holder. The 3-degree lead angle and 0.875-inch center-to-cutting-edge dimension support controlled radial engagement. Compatible inserts follow the N. Top Notch insert family. This tool is typically selected for medium to heavy-duty internal diameter finishing and semi-finishing passes on horizontal and vertical turning centers.

Key Features

• Left-hand cutting geometry for back-boring and reverse-spindle applications
• Top Notch series clamp-style insert holding for rigid, repeatable insert indexing
• Coolant-through capability with 1/4-18 NPT coolant hole thread for in-cut cooling
• 1-1/4 inch steel shank provides rigidity and vibration resistance at 14-inch OAL
• 0.875-inch center-to-cutting-edge dimension for precise bore sizing
• Accepts N. series inserts, broadening insert grade and geometry options

Compatibility

Designed for use with N-style Top Notch series inserts. Specific compatible insert grades and geometries should be confirmed against the KENNAMETAL Top Notch insert catalog for the target workpiece material.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Ensure the machine spindle is fully stopped and the tool turret or boring head is de-energized before mounting or removing the bar. Secure the shank in a properly sized boring head or turret block that matches the 1-1/4-inch shank diameter, and verify overhang does not exceed manufacturer guidance for the bore depth required. Confirm coolant line connection to the 1/4-18 NPT port is leak-free before initiating a cutting cycle.