Article deals the issue of connecting modules in modular structures applied in robotics, manufacturing engineering and technology in general. Themselves joining motion module is implemented interconnecting interfaces, which are placed stringent requirements of strength, stiffness, weight and the possibility of transporting energy and data flow through the interface. On the market can be founds similar solutions. However, these solutions are mostly designed for output stages of industrial robots. Primarily, these solutions focus on the end effector exchange systems in robotics. To determine the total track modular machine was necessary to design a new model for connecting interface that meets all the requirements placed on it.