... tensile nut bolts: 1. Spec.: DIN,JIS,ASTM,GB 2. Surface: black 3. Grade:4.8,8.8 ... .9 4. Material: Q235,45#,40Cr ASTM DIN GB Rail high tensile nut bolts with large hexagon head ... JIS B 1186, ASTM A325, ASTM A490, GB/T 1228, GB/T 1229, GB/T 1230 III. Usage:Supply to railway, ... exporting:1.Our company (Suzhou Sudelan Railway Parts Co., Ltd.) is specializing in producing railway fasteners. We have certified ...