Accupro EJ04400000MSC Taper Drill Chuck Arbor JT4 4MT

Product Description

The ACCUPRO EJ04400000MSC is a taper drill chuck arbor designed to connect a Jacobs Taper 4 (JT4) drill chuck to a machine spindle with a Number 4 Morse Taper (4MT) shank. The arbor serves as the mechanical interface between the chuck body and the machine, transmitting torque and maintaining axial alignment during drilling operations. It has an overall length of approximately 6.69 inches (170 millimeters) and weighs 1.76 pounds. This type of arbor is installed by machinists and toolroom technicians working on drill presses, lathes, or milling machines equipped with a 4MT spindle bore.

This arbor is suited for use in machine shop environments where a JT4-mount drill chuck must be seated onto a 4MT spindle. Typical applications include production drilling on floor-standing drill presses and toolroom lathes. The Morse Taper shank provides a self-holding taper fit that locks securely under axial load, while the Jacobs Taper mount end accepts standard JT4 chuck bodies. This configuration is common in both job-shop and light industrial settings where frequent chuck changes are required.

Key Features

• JT4 Jacobs Taper mount accepts standard JT4 drill chuck bodies
• Number 4 Morse Taper (4MT) shank for self-holding fit in compatible spindles
• Overall length of 6.69 inches (170 millimeters) for standard reach applications
• Weighs 1.76 pounds for balanced handling during installation and removal
• Single-piece arbor construction transfers torque directly from spindle to chuck

Compatibility

Designed as an OEM-style replacement or direct-fit arbor for drill presses, lathes, and milling machines with a Number 4 Morse Taper spindle bore and requiring a JT4 Jacobs Taper chuck mount.

Installation Notes

Installation is typically performed by a machinist or toolroom technician. Before installing or removing the arbor, power down and lock out the machine spindle in accordance with applicable OSHA lockout/tagout procedures. The Morse Taper shank should be clean and free of burrs or oil before seating; a sharp mallet tap on the chuck body is the standard method for seating the taper. Use a drift key through the spindle slot to drive the arbor out during removal — never pry against the chuck body.