Jacobs 7343N Drill Chuck Arbor JT33 Mount R8 Shank

Product Description

The JACOBS 7343N is a taper drill chuck arbor designed to connect a Jacobs Taper 33 (JT33) drill chuck to a milling machine or drill press equipped with an R8 spindle taper. This arbor serves as the mechanical interface between the chuck and the machine spindle, transmitting torque and maintaining concentricity during drilling operations. It measures 5.33 inches in overall length and weighs 1 pound. Installation is performed by machinists, toolroom technicians, and maintenance trades working with Bridgeport-style knee mills and similar R8-spindle machines.

This arbor is suited for use in machine shop, maintenance, and production environments where an R8-spindle machine requires a JT33 drill chuck. It fits vertical knee mills and drill presses with R8 spindle bores. The JT33 mount accepts standard Jacobs-taper chucks sized for the No. 33 taper, making it a common replacement or upgrade arbor in toolroom and general machining setups.

Key Features

• JT33 mount taper interfaces with standard Jacobs No. 33 taper drill chucks
• R8 shank taper fits Bridgeport-style vertical mills and compatible R8-spindle machines
• 5.33 inches overall length provides standard reach for typical chuck-to-spindle setups
• Tapered shank and mount design allows tool-free chuck seating and positive drive under load
• 1 pound total weight keeps spindle load minimal during setup changes

Compatibility

Designed for use with JT33 taper drill chucks on machines equipped with an R8 spindle taper. Specific model compatibility beyond R8-spindle and JT33-chuck fitment was not provided in available product data.

Installation Notes

Installation is performed by a qualified machinist or maintenance technician. Power down and lock out the machine at the spindle before seating or removing the arbor. The R8 shank is drawn into the spindle with the machine drawbar and should be tightened securely before operation. The JT33 chuck is pressed or driven onto the arbor taper and should be removed with a chuck-removal wedge rather than struck directly against the arbor body.