In this thesis, the possibility of using an alternative material to produce heat-shrinkable tool holders of numerically controlled tool machining centres was researched. The basis of the research is a designed tool holder model with a heat-shrinkable clamping head and SK40 tool holder taper according to the dimensions and construction requirements of the ISO 7388-1 standard. Analysis and simulations were performed on the designed model in order to determine the validity of the chosen alternative material. The results of stress analysis according to von Mises theory, material fatigue analysis and thermal analysis were interpreted, and conclusions were given. Optimization of the manufacturing process of the tool holder model was carried out using the method of production by material cutting techniques in order to reduce the time of its production. The listed analyses were performed on the same model using EN ISO 4957:2000 X40CrMoV5-1 steel, which is the standard production used material, and EN 10250 36CrNiMo4/1.6511 steel, which was chosen as the alternative material. The chosen alternative material has similar mechanical characteristics to the standard used tool holder material, while their thermal properties differ. Stress analyses were performed at a maximum stress of 200 Nm, the highest power that the machine tool spindle can deliver. The set parameters that the constructed tool holder from the selected tool must meet are that the maximum load of 200 Nm on the tool holder and the cone can be applied without deformation beyond the tolerances determined by the ISO standard and the manufacturer's specifications and to withstand at least 5000 cycles of thermal exchange of the tool in the holder without cracking the tool holder. With von Mises analysis was determined that the alternative material meets the set criteria. The peak stress is the same in both models, while the equivalent displacement is slightly higher in the alternative material. The service life of the holder meets the requirements, which was determined by the fatigue analysis of the material. When changing the tool, the model constructed with an alternative material requires longer heating and the stress during the change is significantly higher than with the standard material used. Due to the higher machinability factor of the selected material, the tool holder production time was reduced by 6.5 min.