The fatigue limits of metallic materials may be established using their limit cycle diagrams, for various values of stress ratio. On the other hand, the level of actual mechanical stresses in a certain component is taken into account, together with the possible existence of some stress raisers on it, in order to establish (using the schematic limit cycle diagrams) the component safety coefficients in operation. The limit cycle diagrams are plotted in a σa-σm coordinate axis system, i.e. the stress amplitude versus the mean stress graphical representation; any single point on this graph is corresponding to a specific fluctuating stress cycle. Its point of intersection with the abscissa axis (the σm value for σa = 0) represents a stress limit of the component material, from its stress-strain curve in static tensile test, namely σUTS (the ultimate tensile strength) – for predominantly brittle materials, and respectively σy (the yield stress) – for ductile ones. When representing a limit cycle diagram, for a component with some stress raisers in its structure, the possible influence of stress raisers on the above mentioned static stress limits values should be considered. The present paper describes a practical method for determining the fatigue safety coefficients, for a certain component, using the schematic Serensen limit cycle diagram, and considering the stress raisers influence on the static stress limits values.