A method of calculation of the axial rigidity of a radial thrust ball bearing loaded with an axial force is proposed. First, using the proposed method, axial rigidity of an immobile ball bearing is calculated. Later, using the same methods axial rigidity of an axial bearing with lubrication is calculated. Results of the numerical analysis implemented by this method for the S106077YuT bearing with the VNIINP-7 lubricant are shown.