... 12.9 bolt grades: 1.Spec:DIN,JIS,ASTM,GB,UIC 2.Surface:black, HDG 3.Grade:4.8,8.8, ... 10.9,12.9 4.Material:Q235,45#,40Cr ASTM DIN GB ... JIS B 1186, ASTM A325, ASTM A490, GB/T 1228, GB/T 1229, GB/T 1230 III. Usage:Supply to railway, highway ... , Malaysia and Africa and so on. Pictures:1. Certificate 2. Various honorary certificates3. Product12.9 grade high strength bolts 4 ...