... , high tensile strength bolts for rail bridges etc.3, Various type and sizes of tie plates, clamps, fastenings, gauge plates, ... buildings, civil span. Structural steel tower masts and other friction-link project. I bolt steel companies choosing the material quality, ... 1 1/4'' 5.High tensile Description(TC bolt) Torshear type high strength bolts for steel structureMaterialAlloy steel ,carbon steel, ...