Accupro EJ04500000MSC Drill Chuck Arbor JT5 4MT

Product Description

The ACCUPRO EJ04500000MSC is a taper drill chuck arbor designed to connect a Jacobs Taper 5 (JT5) drill chuck to a machine spindle with a Number 4 Morse Taper (4MT) shank. It serves as the mechanical interface between the chuck and the machine, transmitting torque and maintaining concentricity during drilling operations. The arbor features a tapered Morse shank on one end for secure seating in the spindle and a JT5 taper on the mount end to accept a compatible drill chuck. Overall length is 175 millimeters (approximately 6.89 inches). Machinists, tool-and-die makers, and maintenance technicians install this component on drill presses, lathes, and milling machines equipped with a 4MT spindle bore.

This arbor is suited for use in shops running drill presses or lathes with a Number 4 Morse Taper spindle where a JT5-mount chuck is the preferred tooling. Common applications include production drilling, maintenance shops, and machine tool setups requiring a reliable chuck-to-spindle connection. It is appropriate for both light and moderate-duty drilling where a solid taper-on-taper fit is needed to prevent chuck pullout under load.

Key Features

• JT5 Jacobs Taper mount accepts standard JT5 drill chucks
• Number 4 Morse Taper shank seats directly into 4MT spindle bores without adapters
• Taper-on-taper design provides positive, self-holding engagement under drilling loads
• Overall length of 175 millimeters (approximately 6.89 inches) suits standard spindle clearances
• Weighs 2.17 pounds, indicating a robust, solid construction

Compatibility

Designed as an OEM-style replacement or direct-fit arbor for drill presses, lathes, and milling machines equipped with a Number 4 Morse Taper spindle and requiring a JT5 chuck mount interface.

Installation Notes

Installation is performed by qualified machinists or maintenance technicians. Before installing or removing the arbor, power down the machine and bring the spindle to a complete stop. Clean both the spindle bore and the Morse Taper shank with a lint-free cloth to remove oil, chips, and debris before seating the taper, as contamination will reduce holding force and concentricity. To remove the arbor, use the machine's drift slot and a proper drift key rather than striking the chuck body directly, which can damage the chuck or spindle.