Fretting fatigue cracks appear very early in the fatigue life of metals. Fretting fatigue life is dominated by the propagation process of small cracks. Characteristics of fretting fatigue cracks are analysed using stress intensity factors which are obtained at the tip of cracks growing from contact edges. Stress intensity factors are calculated using contact pressure and tangential stress distributions across contact surfaces. Contact pressure and tangential stress distributions are anaysed using the Finite Element Method. Fretting fatigue limits are estimated by comparing the above mentioned calculated results of stress intensity factor ranges with the threshold stress intensity factor range of the material. These calculated results are compared with experimental results of fretting fatigue tests.