Description
Weld-on or Thread-on Tool Joint Subs are designed with one end to shrink fit or screw onto the end of your drill tube and then be welded. The opposite end is the pin or box connection of your choice. Pin or Box to Blank Subs are similar in use to the above subs. They have a blank face, either solid or with an I.D. on the end opposite the pin or box connection.
