Bolts made of high-strength steel, or bolts that require a large pre-tightening force, can be called high-strength stud bolts. High-strength stud bolts are mostly used for the connection of bridges, rails, high-pressure and ultra-high-pressure equipment. The fracture of such bolts is mostly brittle fracture. The high-strength stud bolts used in ultra-high pressure equipment require a large prestress in order to ensure the sealing of the container.
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