During the metal cutting process, finite element (FE) simulation has been acknowledged as an efficient way to provide designers more in-depth understanding. Furthermore, constitutive model parameters of the experimental material play a crucial role in determining the accuracy of FE simulation results. In this study, three different sets of Johnson-Cook (J-C) constitutive model parameters (A, B, n, c, and m) in literature were chosen to investigate the influence on numerical modeling for hard milling of AISI H13 steel. Hard milling experiment was conducted to compare the simulation results obtained by varying constitutive model parameters concerning chip morphology, cutting force, and cutting temperature. The parameter A has a significant influence on chip morphology and cutting force compared to other parameters, while the parameter m shows little impact on cutting temperature variation. The comparison between experimental and predicted results indicates that the considered machining outputs are sensitive to adopted constitutive model parameters, in particular the chip morphology. Based on the analysis, it can be confirmed that constitutive model parameters calibration in advance is a necessary procedure before applying it to metal machining simulation.