Technology condition:1. Circle swing agilely without any blocked 2. Precision of screw thread grades "6h" 3. Ball joint shaft: steel bearing, shaft 35#, 40cr steel 4. Work on -40 ~ 120 degree temperature, excellent performance 5. Standard reference: QC/T327-1999 and relative standard producing area:China payment:T/T OR L/C supplying capacity:100,000 PCS/MONTH