Modification of the punch geometry can greatly reduce the force necessary to perform the perforation of the belt. This paper presents research on the asymmetrical single sheared piercing punch. FEM analysis was performed for a variable shear angle α in a range 5-45° for constant punch diameter D = 10 mm and TFL10S belt. Based on the obtained results, the influence of the shear angle on the perforation force F_P, punch deflection f and pneumatic cylinder stroke increase Δs was determined. FEM analysis was divided into two stages: the dynamic one, which was used to obtain the perforation force in function of punch displacement characteristics and the static one, which helped to established the deflection of the punch for the peak value of the perforation force. Additionally, the application of the obtained results is presented for the punching die design process, when the effective geometrical features of the tools are desired.