Plain bearings are the mechanical elements of wider range of application considering of the variety of conditions to which its design can adapt in many diverse machines and applications. For example, thin sleeves can be found in small machines (automotive alternators), under conditions of variable load and high temperature (connecting rods and crankshafts of internal combustion engines), in very high load situations (railway bearings) or with almost 100% reliability levels in turbomachinery (steam turbines).