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. ... are being used. We exported to world markets, such as U.S.A., Canada, Cuba, Germany, Japan, Singapore, Malaysia and ... equipmentsWorkshop Welcome your visit! Rail fastener high strength structural steel nut bolt