... 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 ... 4775, ISO 7416, JIS B 1186, ASTM A325, ASTM A490, GB/T 1228, GB/T 1229 ... Africa and so on. Pictures:1. Certificate 2. Various honorary certificates3. Product12.9 grade ... Testing equipments Workshop Welcome your visit! ASTM DIN GB Metric High strength hex head ...