... 4Material:Q235,45#,4Cr Rail fastener high strength structural steel nut bolt I. Item:High strength bolts for steel structuresII. Specification: DIN 6914, ... Usage:Supply to railway, highway, bridge, boiler with steel structure, industry workshop, high civil buildings, hoisting machinery and so on.IV ... equipmentsWorkshop Welcome your visit! Rail fastener high strength structural steel nut bolt