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The study shows that considerable reserves still exist for increasing the service times of CrN-coated dies for Al hot extrusion. The main reasons for the decreased service times are revealed and explained regarding the selected CrN-coated die for hot extrusion, i.e. why the service time of the coated-die is not in accordance with the wear resistance of the CrN-coating. The shaping of the bearing surface and presence of the scratches, size and amount of nonmetalic inclusions in the die steel, nodular defects in the CrN-coating, as well as thicknesses uniformity of CrN-coatings along the bearing surface, are relevant influential parameters.