The milling process is one great versatile process and brings severe mechanical and thermal behavior in the cutting region, generating effects under the machined surface part, which can lead to a premature failure. Microhardness variation, heat-affected zone, are examples of many metallurgical changes that may happen due to interaction of the severe behaviors. The effects of each behavior, such as the mechanical, concerning the forces actuating during the chip removal mechanism, or the thermal behavior, which influence the heat generated in the interface between tool/chip/workpiece, can help to understand the effect of the machining parameters. In this context, this study aims to analyze the effect of the machining parameters, ap and ae, on the surface integrity, during the machining of AISI P20 mold steel. For the tests, the cutting section and cutting speed was kept constant, as axial and radial depth parameters changed.