high tensile nut bolts: 1. Spec.: DIN,JIS,ASTM,GB 2. Surface: black 3. Grade:4.8, ... .9 4. Material: Q235,45#,40Cr ASTM DIN GB Rail high tensile nut bolts with large hexagon head for steel ... 7412, ISO 4775, ISO 7416, JIS B 1186, ASTM A325, ASTM A490, GB/T 1228, GB/T 1229, GB/T ... packaging factory view Testing equipments Workshop Welcome your visit! ASTM DIN GB Metric rail hex head high tensile nut bolts