The effect of the sputtering parameters on the mech anical tribology properties of Titanium Aluminum Nitride coating on the tungsten cabide insert tool in the dry turni ng of tool steel has been investigated. The coating was deposited using a Direct Current magnetron sputtering system with v arious substrate biases (-79 to -221 V) and nitroge n flow rates (30 to 72 sccm). The dry turning test was carried out o n a Computer Numeric Code machine using an optimum cutting parameter setting. The results show that the lowest flank wear (~0.4 mm) was achieved using a Titanium Aluminum Nitride-coated tool that was deposited at a high su bstrate bias (-200 V) and a high nitrogen flow rate (70 sccm). The lowest flank wear was attributed to high coating ha rdness.