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 ... 7416, JIS B 1186, ASTM A325, ASTM A490, GB/T 1228, GB/T 1229, GB/T 1230 III. Usage:Supply to railway, highway ... Products: Factory view figures: Welcome your visit! ASTM DIN GB Metric High strength hex head 12.9 bolt grades