... spikes, timber drive spikes, T-bolts, fish bolts, switch & crossing bolts, high tensile strength bolts for rail bridges etc.3, Various type ... level was 10.9, 12.9 grade steel bolts. Steel bolts for the main power system, the machinery industry, the ... High tensile Description(TC bolt) Torshear type high strength bolts for steel structureMaterialAlloy steel ,carbon steel, stainless steel etc.SizeM16 ...