... than 20 years experience steel casting trailer DB front hanger Quality System CertificateISO 9001Dimension ToleranceCT7Surface RoughnessRa6.4~12.5Casting ... , AluminiumDie ForgingRoll ForgingSTAMPING MACHININGAll Metal Material PROCESSMATERIALSTANDARDSAND CASTINGGreen SandGrey Iron, Ductile Iron, Malleable Iron, Stainless Steel, Carbon Steel, Aluminium, Brass, BronzeAISIASTMDINGBBSJISNFAARFuran ...