High-strength hexagonal head bolts designed for steel structures (including bridge), as well as for metal structures used in heavy engineering. These bolts, depending on the design, can be used in areas with an estimated temperature of up to minus 65 ° С.
When manufacturing high-strength bolts are not allowed:
-- tears and dye on the surface of the thread if they extend in depth beyond the average diameter of the thread and if their total length exceeds a quarter of the turn;
-- burrs on support surfaces of bolt heads and burrs on bolt heads extending beyond the support washer.
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* The time resistance is the ratio of the maximum load that the bolt withstands at the time of failure to the original cross section.
** The cost is calculated individually for each application