... ), C27200CuZn37), C28000(CuZn40),etc. 4.Bronze: C51000, C52100, C54400, etc. 5.Iron: 1213, 12L14,1215,etc. 6.Aluminum: Al6061, Al6063, etc ... ,DIN,JIS,ANSI,BSW Manufacture ProcessHeading/washer assembly/Threading/Secondary machine/heat treatment/plating/Anti-slipping/Baking/QA/Package/Shipping Warrantywe ...