... manufacture many kinds of Conventional and Parabolic Leaf Spring,material of 60Si2Mn,SUP9,SUP10,obtained ISO 9001 ... range of Conventional Leaf Spring and Parabolic Leaf Spring which is used in trucks, trailers, agriculture vehicles, light or heavy-duty ... Sup7, Sup9, Sup11.The company has produced advanced automobile spring leaf assemblies and production lines, superior testing equipment and powerful ...