SSM, based in Wädenswil (Switzerland), is a subsidiary of the Rieter Group. SSM is the worldâs leading supplier of precision winding machines in the fields of dyeing, weaving and sewing thread preparation and enjoys success in individual segments of filament yarn production. SSM comprises the companies SSM Schärer Schweiter Mettler AG in Wädenswil and subsidiaries in Italy and China. SSM is represented worldwide in all major markets.