... high strength bolt Surface: plain; black; H.D.Galvanized; zinc plated;Dacron etc. Grade: 8.8,10.9,12.9 Packaging ... : Q235,45#,40Cr,35CrMoA,Q345D,etc. 2.Surface: Black, zinc-galvanization, hot dip galvanization, electro galvanization,plain 3. Size: ... bridge, boiler with steel structure,industry workshop,high civil buildings, hoisting machinery and so on. SETS OF TORSHEAR TYPE BOLTS AND NUTS\10.9