Forcing fit. Bearing inner ring and shaft tight fit. When outer ring and bearing hole is a loose fit, it can use the bearing pressure equipment forcing bearing in the shaft first, then the shaft together with the bearing load bearing hole. When it pressed on the bearing inner ring end face, mating the assembling casing made of a soft metal material (copper or mild steel). Bearing outer ring and bearing hole tight fit. When inner ring and the shaft is a loose fit, the bearing can be pressed into the bearing hole first, then assembling casing diameter should be slightly less than the diameter of a hole. If the bearing ring and shaft and hole is a tight fit, install indoor ring and outer ring should be pressed into the shaft and hole at the same tim. The structure of the mounting sleeve should be able to secure the end face of the bearing inner ring and outer ring at the same time.