Value Collection 222-776 Taper Drill Chuck Arbor JT4 R8

Product Description

The VALUE COLLECTION 222-776 is a taper drill chuck arbor designed to connect a Jacobs Taper 4 (JT4) drill chuck to an R8 shank spindle. It serves as the mechanical interface between the chuck and the machine spindle, transmitting rotational force during drilling operations. The tapered mount seats securely into a JT4-compatible chuck, while the R8 shank fits directly into R8-spindle milling machines and drill presses. Machinists and toolroom technicians install this arbor when setting up drilling operations on R8-spindle equipment. At 1.48 pounds, it is a solid, standard-weight arbor suited for production and maintenance shop use.

This arbor is intended for use in machine shop, maintenance, and manufacturing environments where an R8-spindle machine must accept a JT4 drill chuck. Typical applications include vertical milling machines and drill presses equipped with an R8 spindle taper. It is installed by machinists, tool and die technicians, and maintenance professionals performing tooling setup or chuck changes on compatible equipment.

Key Features

• JT4 (Jacobs Taper 4) mount taper for secure chuck seating
• R8 shank taper for direct fitment into R8-spindle machines
• Tapered shank design provides positive, self-holding engagement with the spindle
• Solid construction at 1.48 pounds for stable chuck-to-spindle connection
• Standard arbor format for straightforward chuck installation and removal

Compatibility

Designed for use with JT4-mount drill chucks on machines equipped with an R8 spindle taper, such as vertical milling machines and drill presses accepting R8 tooling.

Installation Notes

Installation should be performed by a qualified machinist or toolroom technician. Power down and lock out the machine spindle before installing or removing the arbor. The R8 shank should be cleaned and inspected for burrs or damage before seating; the JT4 chuck should be pressed firmly onto the arbor taper using a chuck press or mallet with a protective block. Never use the arbor beyond the rated capacity of the chuck or machine spindle.