SAE 10W is equivalent to ISO 32, SAE 20 is equivalent to ISO 46 and 68, and SAE 30 is equivalent to ISO 100. 

Equivalent Viscosity of ISO-VG Grades at 40oC and SAE Crankcase Oil Grades ... 22, 5W. 32, 10W. 46, 15W. 68, 20W. http://buysinopec.com/collections/hydraulics