threaded rod is made according to GB,DIN,JIN ASTM,and the raw material is low carbon steel,and all kinds of them.eg:M4-M48, threaded rod is made according to GB,DIN,JIN ASTM,and the raw material is low carbon steel,and all kinds of them.eg:M4-M48, 1/4--1-1/2 threaded rod DIN975 CLASS4.8