Jacobs 7320N Drill Chuck Arbor JT2 Mount 4MT Shank

Product Description

The JACOBS 7320N is a taper drill chuck arbor designed to connect a Jacobs Taper 2 (JT2) mount drill chuck to a Number 4 Morse Taper (4MT) machine spindle. This arbor serves as the critical interface between the chuck and the spindle, transmitting torque and maintaining concentricity during drilling operations. It is a standard toolroom and machine-shop component used in drill presses, lathes, and milling machines equipped with a 4MT spindle bore. Machinists, tool-and-die makers, and maintenance technicians install this arbor when mounting or replacing JT2-mount drill chucks on compatible machinery.

This arbor fits drilling setups found in light industrial, production, and maintenance environments. It is appropriate wherever a JT2 chuck must be seated on a 4MT spindle, including bench-top and floor-standing drill presses and lathe tailstocks with a 4MT bore. The Morse taper shank seats securely under drilling load without mechanical fasteners, relying on the self-holding geometry of the taper. Removal requires a drift and mallet applied at the spindle drift slot.

Key Features

• JT2 (Jacobs Taper 2) mount interfaces directly with JT2-bore drill chucks
• 4MT (Number 4 Morse Taper) shank seats in 4MT machine spindles without additional hardware
• Self-holding Morse taper geometry maintains chuck position under axial drilling loads
• Single-piece arbor construction eliminates slip-fit stack-up between chuck and spindle
• Weighs 1.3125 pounds, indicating solid steel construction appropriate for production drilling use

Compatibility

Designed for use with JT2-mount drill chucks installed on machines with a Number 4 Morse Taper spindle bore, including drill presses and lathe tailstocks configured with a 4MT socket.

Installation Notes

Installation and removal should be performed by a qualified machinist or maintenance technician familiar with Morse taper tooling. Before seating or removing the arbor, power down and lock out the machine spindle per applicable LOTO procedures. Clean both the 4MT shank and the spindle bore thoroughly before seating to ensure full taper contact and prevent fretting. To remove, use a properly sized drift in the spindle drift slot and strike firmly with a mallet - do not attempt to pry the arbor from the spindle.