... Drop forging, heat-treatment, galvanized 4.TS16949;ISO9001 TS16949 Carbon steel galvanized Forged Nut for ConstructionAbout Zhongsheng:Rizhao Zhongsheng ... visit us for more information, if you want.MaterialsFerrous AlloysLow Carbon Steel (Grade # EN 1A, SAE 1020, SAE 1010 ... # Free Cutting Brass, DZR, CuZn40Pb2 etc.)And as per customer specified materials in ASTM, DIN, BS, IS, JIS standardsTechnical ...