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129X45 is a steel beam designed for use in building a variety of structures, including industrial, commercial, institutional, and residential buildings. The beam is capable of spanning wide open spaces without the support of intermediate columns. It is commonly used to construct roofs, walls, and columns in these structures. The beam has a high strength-to-weight ratio, providing greater load-bearing ability with reduced steel weight. It has excellent fatigue resistance, making it suitable for use in construction applications subject to cyclic loading or vibration. The beam is often supplied in an unpainted form and can be welded to other components in the structure.