1. load the size, direction and nature of: suited to withstand light load of ball bearings, roller bearings suitable for carrying heavy loads and shock loads. Dang NSK bearings by pure axis to load Shi, General selection thrust bearing; Dang rolling bearing by pure radial load Shi, General selection deep ditch ball bearing or short cylindrical roll child bearing; Dang rolling bearing by pure radial load of while, also has is unlikely to of axis to load Shi, can selection deep ditch ball bearing, and corner contact ball bearing, and tapered roll child bearing and the adjustable heart ball or adjustable heart roll child bearing; Dang axis to load larger Shi, can selection contact corner larger of corner contact ball bearing and the tapered roll child bearing, or selection centripetal bearing and thrust bearing combination in together, In extremely high axial load, requiring larger axial rigidity is especially adapted should be.
2. Allowed speed: NSK bearings are of different types have a lot of differences. Under normal circumstances, friction bearings, heat less, suitable for high speeds. Design should strive to work under conditions of rolling bearings below its speed limit.
3. rigid: bearings are subjected to load, bearing rings and rolling elements may create elastic contact deformation, deformation quantity proportional to the load, whose ratio determines rigidity of bearing size. General bearing preload to improve the rigidity of bearings; in addition, in the bearing design, taking into account the NSK bearing's combination, and arrangement can also improve the supporting stiffness of the bearing.
4. aligning performance and installation errors: bearing mount location, often installed due to manufacturing errors and poor positioning. At this time often cause deflection and thermal expansion of the axis, NSK bearings bear the loads that are too large, lead to the early damage. Self-aligning bearings can be overcome errors caused by the installation of its own shortcomings, and bearings are suitable for this purpose.
5. installation and removal: Taper roller bearings, needle roller bearings and tapered roller bearings, NSK bearings type belonging to the inner and outer rings can be separated (the so-called isolation bearing), easy to install and disassemble.


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