China's standard code GB National Standard MT Coal Industry Standard GB/T country recommendation HB Aviation Industry Standard GBn National Standard (Internal Release) QJ Aerospace Industry Standard GJB National Military Standard QB, SG Light Industry Standard ZB industry standard (professional standard) JZ, JG Ministry of Environmental Protection Standards ZBn industry standard (internal release) CB China Shipbuilding Corporation Standard ZJB professional military standard LD Labor and Personnel Standard JB Machinery Industry Standards (Original) Ministry of Machinery Industry Standards JC National Building Material Bureau Standard JB/Z (former) Ministry of Machinery Industry Guidance Documents JJC National Bureau of Metrology Standard EJ (former) Nuclear Industry Standard CAS China Standards Association Standard YB Metallurgical Standard CVA China valve industry standard HG Chemical Industry Standard Q/TH (original) Ministry of Machinery Industry General standard for chemical general machinery SY (formerly) Ministry of Oil Standards JB/TQ Ministry of Machinery and Electronics Industry General Standard for Internal Machinery Industry SD Hydroelectric Power Standard H Universal Design Standards for High Pressure Pipes, Fittings and Fasteners Foreign standard code ISO International Standard AISI American Iron and Steel Institute Standard ANSI American National Standard API American Petroleum Institute Standard BS British National Standard MSS Standards Institute for Valves and Fittings Manufacturers' Standards, USA DIN German national standard AWS American Welding Association Standard NF French National Standard ASI American Standard Institute Standard JIS Japanese Industrial Standard MIL U.S. Military Standard ASME ASME Standard JPI Japan Petroleum Institute Standard ASTM American Materials Testing Association Standard Steel Door,Truck Door Lock,Truck Door Extension,Door Handle Hana Auto Parts Co., Ltd. , http://www.zjautomirrors.com