
1) Move smoothly without stagnation.
2) Adequate lubricant should be filled into ball socket.
3) Accord with QC/T327-1999 and relevant standards.
Material and surface treatments:
1) Ball socket: high intensive zinc alloy. Natural color.
2) Ball stud: 40Cr alloy steel.Zinc plating.
3) Sealing cap: Neoprene rubber.