The purpose of using bearings is to create a support for moveable parts. Bearings In addition to the main number indicating its type, size and dimensions, have extensions, each extension representing a specific feature in the interior or exterior design of the bearing. Since these signs and their concepts are not specific to the standard and are determined directly by each manufacturer, the NIKA bearings also have their own signs and concepts. Functionally, sliding bearings can potentially give unlimited life. If the bearings work under certain conditions it can have a much longer lifespan than the formulas. According to this theory, the concept of fatigue load limit is considered fatigue and this is the amount of load that will not cause fatigue if the bearing is lower than it is. The size of a bearing is selected based on the bearing load capacity, taking into account the expected load and lifetime with a specific safety factor.