Covers definitions, classes of ball screws, recommended combinations of screw diameters and lead, recommended drawing format, and performance characteristics of ball screw and nut assemblies as applied to machine tools. The values stated in U.S. customary units are to be regarded as the standard. Metric values are converted from the customary values per recommendations of "ASME Guide SI-1, ASME Orientation and Guide for Use of SI (Metric) Units."