The nominal diameter of the ball screw is the outer diameter of the screw. Common specifications are 12, 14, 16, 20, 25, 32, 40, 50, 63, 80, 100, 120, but please note that among these specifications, Please refer to the manufacturer's product samples for specific values. Only two concepts are explained here: dynamic rated load and static rated load. The former refers to the rated axial load in motion, while the latter refers to the rated axial load at rest. Just refer to the former when designing. It should be noted that the rated load is not the maximum load, and the smaller the ratio of the actual load to the rated load, the higher the theoretical life of the lead screw. Suggestion: Try to choose the diameter 16~63.