Jacobs 7328DN Drill Chuck Arbor JT4 Mount 5MT Shank

Product Description

The JACOBS 7328DN is a taper drill chuck arbor designed to connect a Jacobs Taper 4 (JT4) chuck mount to a No. 5 Morse Taper (5MT) machine spindle. This arbor serves as the mechanical interface between the drill chuck and the spindle bore of a drill press, milling machine, or lathe. It transmits rotational force and maintains axial alignment during drilling operations. The JT4 mount accepts chucks with a matching Jacobs Taper 4 socket, while the 5MT shank seats firmly into a No. 5 Morse Taper spindle. Machinists, toolroom technicians, and maintenance professionals install this arbor when setting up or replacing chuck assemblies on heavy-duty machine tools.

This arbor is suited for industrial and shop environments where No. 5 Morse Taper spindles are standard, including large drill presses, radial arm drills, and milling machines. The JT4 chuck mount accommodates mid-to-large capacity Jacobs-pattern drill chucks commonly used in production and maintenance drilling applications. It weighs 3.625 pounds, reflecting the robust construction expected for this spindle size.

Key Features

• JT4 (Jacobs Taper 4) chuck mount for secure, self-centering chuck installation
• No. 5 Morse Taper shank seats into 5MT spindle bores without additional hardware
• Taper-on-taper design provides rigid, repeatable chuck alignment
• Solid construction suited for heavy-duty drilling loads typical of large machine tools
• Single-piece arbor eliminates separate adapter components

Compatibility

Designed for use with JT4-mount drill chucks on machine tools equipped with a No. 5 Morse Taper spindle bore. Consult your machine tool and chuck documentation to confirm JT4 chuck socket and 5MT spindle specifications before installation.

Installation Notes

Installation is typically performed by a machinist or qualified toolroom technician. Power down and lock out the machine spindle before seating or removing the arbor. Clean both the 5MT shank and the spindle bore thoroughly to remove chips, oil, and debris before driving the arbor home with a soft-face mallet or draw bar. Remove the arbor using the machine's built-in drift slot and a properly sized drift key to avoid damage to the spindle bore or the arbor taper.