Considering that after the shafting is installed, the inner hole of the stern tube will increase by an oil film gap value δ compared with the stern shaft. The value of δ (installation clearance) is between 0.6 and 1.1 mm depending on the diameter of the journal. Since the stern shaft falls on the bottom of the bore of the stern tube bearing due to its own weight after the shafting is installed, in order to ensure that the centerline of the stern tube bearing is consistent with the centerline of the shafting, the centerline of the bore of the stern tube bearing is higher than the centerline of the shafting by half a clearance value, that is, 0.5δ;
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