Long bolts are widely used in structural engineering to improve the adaptability, flexibility, and reusability of steel components. Despite their growing application, current design standards lack sufficient guidelines for the specific design and performance criteria of long bolts. This paper presents a comprehensive experimental and analytical investigation aimed at characterizing the tensile performance of long bolts to facilitate their inclusion in the component method as outlined in EN1993-1-8. The experimental campaign involved 66 tests, exploring various parameters such as four different bolt diameters (M20, M24, M27, and M30), two bolt grades (8.8 and 10.9), and two surface finishes (black and galvanized). Both single and double nut configurations were tested to assess the differences in failure modes. This study is part of the larger RFCS CONNECT4C European Research Project, which also considers bolt behavior in shear, preloading, and relaxation. Findings from the investigation indicate that the existing design equations for bolt tensile resistance and stiffness, as specified in current standards, can be applied to long bolts. However, using a single nut on each end of a long bolt significantly increases the likelihood of premature nut thread stripping, which leads to a reduction in ductility and overall structural performance. Beyond assessing the tensile behavior of long bolts, this study also aims to validate the tensile resistance formula outlined in EN1993-1-8. A reliability analysis, performed in accordance with Annex D of EN 1990, seeks to confirm the safety and accuracy of the design equations for long bolts under tensile loading conditions. Through this research, the goal is to provide a more robust design framework for long bolts, ensuring their safe and effective use in structural applications.