This master thesis is about the process of hard turning. Theoretical knowledge about the process of turning is given in introduction where the discussion was mostly about the cutting tool materials, deposition of coating on the cutting tool and mechanisms of wear induced on the cutting tool. Various results from many different experimental studies, whose goal was to find correlation between various cutting parameters and responses of the process of hard turning, are described. Purpose of this thesis is to consider increasing of the production productivity by using the process of hard turning instead of traditional grinding. Technological perspective of HSK C-160 spindle is given alongside explanation of required investment into center-hole grinding machine. Experimental study of this thesis was conducted on the basis of circumscribed central composition design (C-CCD) in order to find the machinability of hard turning low-alloy steel (20MnCr5) hardened between 68 – 70 HRC with CBN cutting tool. According to the results of experimental part of this thesis selection of cutting parameters that make the use of hard turning possible is given. Through the analysis of hard turning machining time in the given operation was concluded that it requires under 1 h. Considering that currently same operation requires 6 h of machining on CNC grinding machine, multiple increase of production productivity can be achieved.