Specifies the international (IEC 72) system of designations for machine parts (frames, mounting flanges, and shafts) and of the machines themselves, whether foot-mounted, flange-mounted, or both. Standardized dimensions are specified for machines with shaft heights from 56 mm to 400 mm, flanges from 55 mm to 1080 mm PCD, shafts of 7 mm to 150 mm diameter, and slide-rail mountings for machines with shaft heights from 80 mm to 315 mm. Appropriate flanges are specified for particular frame sizes.