Currie Enterprises 2" Johnny Joint With Welded Stud And Hardware Currie's Johnny Joints offer 30 degrees of unrestricted movement in any direction as compared to 22 degrees on a common heim joint. The special center ball is heat-treated steel for extra strength, cross-drilled for thru-bolt lubrication, features a 7/16" thru bolt hole, and a 2" mounting width.