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In the sliding pairs, friction and wear are the core reasons for energy losses that reduce the efficiency of the mechanical systems. This paper presents an experimental study to predict the frictional and wear behaviour of AISI 4340 steel under lubricated conditions. The experiment was conducted on a pin on disc machine in which EN-31 steel disc was used as a counter surface. The tribological characteristics of AISI 4340 material were observed under different loads varied as 30N and 90N at a fixed sliding distance of 1500m at a continuing speed of 1.0, 1.5, 2.0, 2.5 m/s. It was found that variation of load and sliding distance plays a crucial role in frictional force and wear behaviour of the gear material. The wear and tear of AISI 4340 steel was found to be increased with sliding distance. Load is the significant factor which liable for wear loss. The result showed that all loads the COF was minimum at the sliding speed of 2.0 m/s and COF increases with the rise in sliding speed.
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