Value Collection 222-774 Drill Chuck Arbor JT33 R8

Product Description

The VALUE COLLECTION 222-774 is a taper drill chuck arbor designed to connect a Jacobs Taper 33 (JT33) drill chuck to a milling machine or drill press spindle with an R8 shank taper. The arbor serves as the mechanical interface between the chuck and the spindle, transmitting torque and maintaining concentricity during drilling operations. It is a standard toolroom accessory used by machinists and tool-and-die technicians in both production and maintenance environments. The part weighs 1.04 pounds and ships as a single unit.

This arbor is suited for manual knee mills, vertical milling machines, and drill presses equipped with an R8 spindle taper — a common configuration on Bridgeport-style and comparable knee mills found in job shops, maintenance facilities, and vocational training environments. It accepts JT33 Jacobs Taper chucks, which are a widely used chuck mount size for mid-range drill chucks. Installation requires no special tooling beyond a drawbar wrench for the R8 shank and a soft mallet or arbor press for seating the chuck.

Key Features

• JT33 Jacobs Taper mount accepts standard JT33 drill chucks
• R8 shank taper interfaces directly with R8 spindle bores common on knee mills
• Tapered shank and mount provide self-locating, positive engagement under cutting loads
• Single-piece construction — no sub-components or assembly required
• Compact form factor suitable for space-limited spindle clearances

Compatibility

Designed for use with JT33 Jacobs Taper drill chucks mounted in milling machines or drill presses with an R8 spindle taper.

Installation Notes

Installation is typically performed by a machinist or qualified machine tool operator. Before mounting or removing the arbor, power down the machine and confirm the spindle is fully stopped. Seat the R8 shank into the spindle bore and secure with the machine drawbar to the manufacturer torque specification for your machine. Press the JT33 chuck onto the arbor taper using an arbor press or by careful hand-seating — do not strike the chuck with a steel hammer, as this can damage the taper seat or chuck jaws.