... Grade: 8.8,10.9,12.9 Tortous type high strength bolt,nut and washer for steel structures >> We manufacture ASTM E1852 ... dip galvanization, electro galvanization,plain 3. Size: M5-160 and according to customers' requirements 4. Grade: 8.8,10.9,12 ... to railway, highway, bridge, boiler with steel structure,industry workshop,high civil buildings, hoisting machinery and so on. SETS OF TORSHEAR TYPE BOLTS AND ...