For ball screw precision tolerance, now have C10, C7, C5, C3, C2, C1. The smaller the number, the higher the accuracy. The most widely use ball screw now is C7 and C5. Our C7 ball screw is rolled thread ball screw, which the accuracy is C7=0.05mm in 300mm length. It is widely use in CNC machinery, precision tool machine, industrial machinery, electronic machinery, high-speed machinery.