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Bolts made of steel used to comply with the requirements of 2.9.3.2.1, 2.9.3.3.3, and 2.9.3.4.2 having a greater strength than specified by ASTM A307 shall be permitted, provided that the maximum allowable stresses increased proportionally based on the ratio of the ultimate strengths. Elongation shall conform to the requirements of the corresponding ASTM specification.

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