The market requirements for various mechanical devices and instruments using rolling bearings are becoming increasingly stringent, and the conditions and performance required for bearings are becoming increasingly diverse. In order to be able to select the most suitable bearing from a large number of structures and sizes, it is necessary to study from various angles. When selecting a bearing, generally, the bearing structure, the ease of mounting and dismounting, the space allowed for the bearing, the size of the bearing, and the marketability of the bearing are generally considered. Secondly, the bearing size is determined while comparing the design life of various machines using bearings and the various endurance limits of the bearings. When selecting a bearing, it is often preferred to consider only the fatigue life of the bearing. The grease life, wear, noise, etc. caused by the aging of the grease also need to be fully studied. Furthermore, depending on the application, it is necessary to select bearings that are specially designed for accuracy, clearance, cage structure, grease, and the like. However, there is no order or rule for selecting bearings. It is especially practical to consider the conditions, performance, and most relevant requirements for the bearings.

○The conditions and performance required for the bearing

○ Conditions of use, environmental conditions

○ Bearing installation part size items

○The space allowed by the bearing

○The size and direction of the load

○Vibration, shock

○Rotation speed, the limit speed of the bearing

○The inclination of the inner and outer rings

○Axial direction fixing and bearing arrangement

○Easy loading and unloading

○ noise, torque

○ Rigid

○Market and economy

Determine the bearing structure and arrangement

○Use mechanical and design life

○ Equivalent dynamic load or equivalent static load

○ Rotation speed

○ Allow static load factor

○ Allow axial load (in the case of cylindrical roller bearings)

Determine the bearing size

○The accuracy of the rotary runout

○High speed rotation

○ Torque change

Determine the bearing accuracy level

○ cooperation

○ Temperature difference between inner ring and outer ring

○ Rotation speed

○The inclination of the inner and outer rings

○Preload

Decide (internal) clearance

○ Rotation speed

○ noise

○ use temperature

Determine the shape and material of the cage

○ use temperature

○ Rotation speed

○Lubrication method

○ Sealing method

○Maintenance and maintenance

Determine the lubrication method, lubricant, sealing method

○ Loading and unloading order

○Work card mold

○ Size related to installation

Decide on the size associated with the installation

Decide on handling method

Bearings and parts around the bearings

Final specification