R8-4JT Jacobs Drill Chuck Arbor
Model #: JACA-R8-J4
Description: R8- 4JT JACOBS BRAND Drill Chuck Arbor
- R8 Shank with 7/16-20 drawbar thread
- 4 Jacobs Taper for Drill Chuck Mounting
- Made by Jacobs
Premium quality and accuracy.
For Bridgeports and similar vertical milling machines.
Dimensions of Jacobs tapers (which fit into the back of the drill chuck) are posted in the "Metalworking Reference" portion of this website.