high tensile nut bolts: 1. Spec.: DIN,JIS,ASTM,GB 2. Surface: black 3. Grade:4.8,8.8, ... ,12.9 4. Material: Q235,45#,40Cr ASTM DIN GB Rail high tensile nut bolts with large hexagon head for ... 7416, JIS B 1186, ASTM A325, ASTM A490, GB/T 1228, GB/T 1229, GB/T 1230 III. Usage:Supply to railway, highway ... -mail! Factory view figures: Welcome your visit! ASTM DIN GB Metric rail hex head high tensile nut bolts