Abstract The main objective of this work is to model wear a disc which was subjected dry contact with ball in unidirectional sliding. Tribological tests sliding pairs were carried out using tribological tester T-11 ball-on configuration. Stationary balls made 100Cr6 steel hardness 62 ± 2 HRC co-acted rotating discs 42CrMo4 40 2HRC. Discs machined by lapping, grinding, milling, and vapour blasti...