"The article introduces the results of the use of plasma technology to reinforce the elements of cutter rock drilling bits. The method of hard facing is currently being widely used; the method is based on getting ionic component of metal in the plasma of arc discharge. The main advantage, which has predetermined the wide spread occurrence of vacuum ionic-plasma method is the fact that in within a compact and simple device it is possible to obtain plasma jet of metal with high level of ionization and high average ion kinetic energy. It makes it possible to transfer thermodynamically-equilibrium covering generation process into essentially non-equilibrium - straight plasma chemical synthesis. At that the values of critical temperatures at which the required level of adhesion is obtained, high rate of connection formation reaction, and the required level of cohesive interaction, can be reduced from 1000°С to near normal values. Furthermore, possibility emerges to obtain coverings unique in composition with various content of components. As the result of investigations fulfilled, optimal materials are determined, as well as parameters and regimes of plasma coating of abrasion-resistant covering on link rails of bearing units of cutter rock drilling bits. Practical use of the investigation results will allow significantly increase operational life and reliability of bearing units of a cutter rock drilling bit and, consequently, increase efficiency and reduce the cost of drilling operations."