... certification 2.have 19 patents:6 patents of invention,13 patents of utility model Company ProfileSpecialized in this field for more than 15 ... .Obtained ISO9001:2000,ISO9001:2008,and 19 patents.Have agents in many places,like Japan,India etc.,and cooperate with many ... , axial play clearance is 0~0.05. SF2005 ball screw used in CNC machine