Table 1 summarizes the coating systems thickness, wear groove depth (WGD) and specific wear rate (W) for the thin and the thick coating system. The sliding wear resistance of the TiAlN/TiN coatings over nitrided and non nitrided H13 substrates is determined by Adhesion, coating thickness as well as hardness change across the coating thickness. For instance, the thin TiAlN/TiN over non nitride substrate shows the largest specific wear rate (W). Since, it presents a poor adhesion (Fig. 3a) and as well as the hardness across the coating thickness is the lowest (Fig. 4a). Furthermore, the thin coating system over case A and B shows the same hardness behavior as indicated in Fig. 4a, but the coating system thickness over case A is smaller than