high tensile nut bolts: 1. Spec.: DIN,JIS,ASTM,GB 2. Surface: black 3 ... 12.9 4. Material: Q235,45#,40Cr ASTM DIN GB Rail high tensile nut bolts with large ... Item:High strength bolts for steel structuresII. Specification: DIN 6914, DIN 6916, DIN 7990, DIN 7999, DIN 931, ISO 7412, ISO 4775, ISO ... Testing equipments Workshop Welcome your visit! ASTM DIN GB Metric rail hex head high tensile nut bolts ...