... diesel engine and engineering machinery;hydraulic system of locomotive, aerospace Oil Tube Features: 1) Executive standard: GB30932) Specification range: OD: 6 ... ,ST37,ST37.4,ST45,ST52,ST52.4,4) ASTM,DIN,EN,JIS Descriptionseamless steel pipes,seamless steel pipes,cold-drawn or ... at sightDelivery time30-60 days depend on Quantity High Pressure Oil Tube