Abstract: An economical convenient coupling and process are provided to more safely secure screw conveyor sections together to enhance the longevity and wear of the screw conveyor, prevent accidents, and minimize downtime and repair. In the user-friendly coupling and process, internally threaded bushings are plug welded to the hollow core of the shafts and a double ended thread stud are screwed into the bushings along the axis of the shafts. The studs and bushings are hidden from view in the interior of the shafts and securely lock the screw conveyor sections together without the use of exterior, transverse or vertical bolts, nuts and locking pins, which can shear and damage downstream processing equipment and injure consumers and operating personnel.