... patents of invention,13 patents of utility model Company ProfileSpecialized in this field for more than 15 years.Plant area cover ... .Obtained ISO9001:2000,ISO9001:2008,and 19 patents.Have agents in many places,like Japan,India etc.,and cooperate with many ... precision is C7,Variation per 300mm is less than 0.05, axial play clearance is 0~0.05. SF2005 ball screw used in CNC machine