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Threaded connections are widely employed in machine construction as fasteners, most often under static loads, but can also occasionally come under impulse or impact load. The latter type of load is particularly dangerous for this type of components. The paper presents MES analysis of a threaded connection under impulse load. The analysis takes into account thread geometry and axial force load. The material for the connection elements was modeled as elastic material. The work presents 2D models usable for determining the stress on components under static load together with 3D models utilized for determining the state of stress in components under dynamic loads (impact, impulse).