High surface finish values were obtained by coated inserts due to their less co-efficient of friction and low thermal conductivity of the coating. The effect of coating on tool produced better tool wear results in all cutting speeds while comparing to the uncoated tool. While the coating is still intact, the tool wear rate is very low, due to the high wear resistance of the coating. Coated tools performed better in surface roughness than the uncoated tool particularly with cutting speed above 350m/min. At the same time, the tool wear rate increased very sharply once the coating start to worn off and the work piece comes into direct contact with the substrate of the tool, which is much less resistant. At the cutting speed of 500 m/min, the coated tool performed excellently with less tool wear and minimum surface roughness, but the maximum flank wear occurred to the insert. Generally the coated inserts performed well at higher cutting speeds and moderate feed rate.