... 's drawings. 3Certificate:ISO9001:2008,SGS Tortous type high tensile bolts and nuts washers for steel structures 10.9 ... highway, bridge, boiler with steel structure,industry workshop,high civil buildings, hoisting machinery and so on. Our ... :3. Products: DrawingsTHE SAMPLE OF THIS KIND OF HIGH STRENGTH BOLT, GB/T 3632 Product figures 4. ... ASTM E1852 for steel structures 10.9 high tensile bolts and nuts