... ,12.9 4.Material:Q235,45#,40Cr ASTM DIN GB Standard High strength 12.9 bolt grades with large hexagon head ... 6914, DIN 6916, DIN 7990, DIN 7999, DIN 931, ISO 7412, ISO 4775, ISO 7416, JIS B 1186, ASTM A325, ASTM A490, GB ... view Testing equipments Workshop Welcome your visit! ASTM DIN GB Metric High strength hex head 12.9 bolt grades