... delivery 4.OEM service CNC machine ball screw SFU DFU seriesBall screw series:DVF,SFI,DFI, SFU,DFU ... ,SFT,DFT series etc.Ball screw brabd name:HIWIN,TBI,THK, ... the basic of long term business. Ball Screw specification(SFU series): I: Lead Da: Ball Dia. K: Stiffness (Kgf/μ m ... 450207.1444621.111881.367.9Ball Screw specification(DFU series): I: Lead Da: Ball Dia. K: Stiffness (Kgf/μ m) ...