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 ... Q235,45#,40Cr ASTM DIN GB Standard High strength 12.9 bolt grades with large hexagon head for steel structures I. ... Pictures:1. Certificate 2. Various honorary certificates3. Product12.9 grade high strength bolts 4. Factory view figures:packaging ... ASTM DIN GB Metric High strength hex head 12.9 bolt grades