Jacobs 7316DN Drill Chuck Arbor JT4 Mount 3MT Shank

Product Description

The JACOBS 7316DN is a taper drill chuck arbor designed to connect a Jacobs Taper 4 (JT4) drill chuck to a machine spindle with a No. 3 Morse Taper (3MT) shank. This arbor serves as the mechanical interface between the chuck and the machine, transferring rotational force while maintaining precise alignment. It is used in drill presses, milling machines, lathes, and similar machine tools where a JT4 chuck must be mounted on a 3MT spindle. Machinists, tool and die technicians, and maintenance mechanics are the primary installers of this type of arbor.

This arbor fits machine tool applications where the spindle accepts a No. 3 Morse Taper and the chuck uses a JT4 mount. Typical installations include benchtop and floor-standing drill presses, knee mills, and manual lathes in job shops, maintenance facilities, and light manufacturing environments. The arbor is a direct-drive, no-keyway interface relying on taper-to-taper friction fit on both ends.

Key Features

• JT4 (Jacobs Taper 4) chuck mount for secure, repeatable chuck seating
• No. 3 Morse Taper (3MT) shank for direct insertion into compatible machine spindles
• Taper-on-taper design provides rigid, self-centering fit without fasteners
• Compact, single-piece steel construction for reliable torque transfer
• Compatible with standard JT4 drill chucks from major manufacturers

Compatibility

Designed for use with drill chucks using a JT4 (Jacobs Taper 4) mount and machine spindles or tailstocks accepting a No. 3 Morse Taper shank. Specific compatible model numbers were not provided in the product data.

Installation Notes

Installation is performed by machinists or qualified maintenance personnel. Before installing or removing the arbor, power down and lock out the machine per OSHA lockout/tagout procedures. The Morse Taper shank should be clean and free of burrs before seating; drive the arbor firmly into the spindle to achieve full taper contact. To remove, use a drift key through the spindle drift slot - never pry directly against the chuck or arbor body.