12.9 bolt grades: 1.Spec:DIN,JIS,ASTM,GB,UIC 2.Surface:black, HDG 3.Grade:4.8, ... 9,12.9 4.Material:Q235,45#,40Cr ASTM DIN GB Standard High strength 12.9 bolt grades with large hexagon ... , JIS B 1186, ASTM A325, ASTM A490, GB/T 1228, GB/T 1229, GB/T 1230 III. Usage:Supply to railway, highway ... view Testing equipments Workshop Welcome your visit! ASTM DIN GB Metric High strength hex head 12.9 bolt grades