When mixing oils and fats, never mix incompatible oils and fats. If two incompatible oils and fats are mixed, their consistency will usually become soft, which may cause damage to thin-walled bearings due to the easy loss of oil. If you do not know which type of lubricating grease the bearing originally used, you must first remove the old grease inside and outside the bearing before adding new grease.

The classification of fats and oils is mainly based on temperature and working conditions: fats and oils can be classified according to their allowable working temperature. The consistency and lubrication ability of fats and oils are affected by the working temperature. Thin walled bearings operating at a certain temperature must choose fats and oils that have correct consistency and good lubrication effect at the same temperature. Oils are manufactured in different operating temperature ranges and can be roughly divided into low temperature, medium temperature, and high temperature oils. At the same time, there is a type of grease called anti extrusion or anti extrusion with the addition of molybdenum disulfide, and additives are added to enhance the strength of the lubricating oil film.

Several important factors for selecting lubricating grease: mechanical type; Types and sizes of thin-walled bearings; Operating temperature; Workload situation; Speed range; Working conditions, such as vibration and whether the direction of the spindle is horizontal or vertical; Cooling condition; Sealing effect; Peripheral environment. Deep groove ball bearings, four point contact bearings, and angular contact ball bearings with thin-walled ring bearings can be deep groove ball bearings (C), four point contact bearings (X), or angular contact ball bearings (E). The above various designs are available in different series. The series depends on the size of the cross-section. The ball matches the series. Deep groove ball bearings can support both axial and radial loads in both directions. Four point contact bearings can support bidirectional axial and radial loads; Therefore, they operate in the same way as double row angular contact ball bearings.

Angular contact ball bearings can match an optimal number of balls and have a contact angle of 30 °. They support higher radial loads than deep groove ball bearings or four point contact bearings, and can support axial loads originating from the same direction. For special needs, angular contact ball bearings can also be provided as matching bearings. Therefore, the rigidity and load-bearing capacity of these combinations are much higher than those of single bearing products.