Accupro ER8J200000MSC Taper Drill Chuck Arbor JT2 R8

Product Description

The ACCUPRO ER8J200000MSC is a taper drill chuck arbor designed to connect a Jacobs Taper 2 (JT2) drill chuck to an R8 shank spindle. It serves as the mechanical interface between the chuck and the machine spindle, transmitting torque and maintaining concentricity during drilling operations. The mount taper is JT2, and the shank taper is R8, making this arbor a direct-fit adapter for milling machines and knee mills equipped with R8 spindles. Machinists and tool room technicians install this part when mounting a drill chuck to an R8-spindle machine without a keyed or threaded shank connection.

This arbor is suited for vertical milling machines, knee mills, and similar machine tools with R8 spindles commonly found in job shops, tool rooms, and maintenance departments. The JT2 mount accepts standard Jacobs Taper 2 drill chucks. It is appropriate for light to moderate drilling operations where a secure, repeatable chuck-to-spindle connection is required. Installation requires seating the R8 shank into the spindle and pressing or locking the JT2 mount into the chuck body per standard shop practice.

Key Features

• JT2 mount taper for compatibility with Jacobs Taper 2 drill chucks
• R8 shank taper for direct fit into R8-spindle milling machines
• Compact and lightweight at 0.93 pounds for easy handling and tool changes
• Single-piece arbor construction provides a rigid, low-runout connection

Compatibility

Designed as a direct-fit arbor for milling machines and knee mills equipped with R8 spindles, paired with drill chucks using a Jacobs Taper 2 mount.

Installation Notes

Installation is performed by a machinist or tool room technician. Power down and lock out the machine spindle before inserting or removing the arbor. Seat the R8 shank fully into the spindle bore and secure with the drawbar before operating the machine. Drive the JT2 mount into the chuck body using a soft mallet or arbor press to ensure a solid, concentric fit; do not use excessive side force that could damage the taper surfaces.