In designing bolted joints, it is important to discuss a clamping effect (contact stress distribution) and to estimate the force ratio (the ratio of an increment of bolt axial force to an external load). In order to improve the clamping effect, raised faces of the interfaces have been used. But theoretical grounds are not made clear. No investigations on the case where an external bending moment is applied to bolted joints are made either except some ones reported. In this paper, the clamping effect and the force ratio in the cases where T-flanges of which interfaces have non-contracted parts are subjected to external bending moments are analyzed using the two-dimensional theory of elasticity and the point-matching method. For verification, experiments are carried out with respect to the contact stress distribution and the force ratio for the external bending moment. Analytical results are in a fairly good agreement with experimental ones.