nut bolt: 1Spec:DIN,JIS,ASTM,GB,UIC 2Surface:black 3Grade ... 4Material:Q235,45#,4Cr Rail fastener high strength structural steel nut bolt I. Item:High strength bolts for steel structuresII. ... JIS B 1186, ASTM A325, ASTM A490, GB/T 1228, GB/T 1229, GB/T 1230 III. Usage:Supply to railway, highway, bridge ... equipmentsWorkshop Welcome your visit! Rail fastener high strength structural steel nut bolt