... 8,10.9,12.9 4Material:Q235,45#,4Cr Rail fastener high strength structural steel nut bolt I. ... GB/T 1229, GB/T 1230 III. Usage:Supply to railway, highway, bridge, boiler with steel structure, industry workshop ... please send the details and drawings of the products to our e-mail! Our strength on exporting: 1. ... railway and now they are being used. We exported to world markets, such as U.S.A., Canada, ...