Xi'an Shew-E Steel Pipe Co.,Ltd is one of the leading st37.4 precision pipe suppliers and also a famous such manufacturer, equipped with many professional st37.4 precision pipe factories, welcome to purchase high quality st37.4 precision pipe from our company.Standard: DIN1630Materials: St37.4Technical: cold-draw Application: used in the hydraulic cylinder of the Heavy Machinery, Cranes, Excavator and Forklifts.Tolerance：