... grade: A135-A, 10#, A315-B, 20#, St37, St45 High Pressure Seamless Tube for Diesel EngineSteel grade: A135-A, 10#, A315-B, 20#, St37, St45 ... "-0.8661"); Dimension tolerance: O.D.: +/-0.08mm, W.T.: +/-10%;Application: This product adopts advanced cold-drawing and thermal treatment ...