PSR & PSRT Series precision rolled C5 accuracy grade ball screws are the choice when low cost yet high accuracy is desired. A high quality proven precision rolling process is used to create the ball screw thread. Accuracy grade of C5 is available The ball end journals are finished on the PSRT products. The product ships as one assembly (i.e., with ball nut installed on the screw). The products in the table are typically readily available in small quantities.