... of invention,13 patents of utility model Company ProfileSpecialized in this field for more than 15 years.Plant area ... ISO9001:2000,ISO9001:2008,and 19 patents.Have agents in many places,like Japan,India etc.,and cooperate ... with many big companies.Production:NOTE:Ball screw precision is C7,Variation per 300mm is ... 05, axial play clearance is 0~0.05. High precision ball screw SF1605