Abstract: The stress concentration factor distribution along the weld toe for tubular X-joints subjected to axial loads have been analyzed using finite element method. Through numerical analysis, it has been found that the peak stress concentration factor for the analyzed model is located at the saddle position. The effect of the geometric parameters of a tubular X-joint on the stress concentration factor has been investigated. Based on the numerical results, a parametric equation used to calculate the stress concentration factor of tubular X-joints has been proposed. The accuracy of this equation has been verified against the requirement of the Fatigue Guidance Review Panel, and it has been found that the proposed equation can produce reasonably accurate stress concentration factor values for tubular X-joints subjected to axial loads.