At the present time, the heat treatment process plays an important role in the production of automobile parts. This is valid especially for the transmission components. During the last few years, it has been possible to see increasing requirements for these components. The main aim of the heat treatment, in case of the transmissions components, is to improve the desired properties of the final product. This is primarily to increase the hardness and resistance of wearing such components and thus to prolong their lifetime. This paper compares two methods of heat treatment. The first method is oil hardening and the second hardening in gas pressure. The production quality, process timing, required temperature and operational costs are set up as basic evaluation criteria. On the basis of this analysis, the suitable method for mass production of gearbox components is recommended.Keywords: Heat treatment, Transmission components, Production quality
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