The reference book contains brief general recommendations on the design of products and technological equipment used in mechanical engineering, taking into account the physical and mechanical properties and technological features of various structural materials, information on the calculation of elements of mechanisms and machines, thermal and chemical-thermal treatment, protective and decorative coatings, tolerances and fits, interchangeability, surface roughness. The second edition was revised taking into account the data of the new GOST for mechanical engineering, significantly supplemented with new information on highly efficient processing processes.